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Home My WebLink AboutSWP272171(7) northwest hydraulic consultants inc. ' edmonton 22017 70th avenue s. va n c o u ve r kent,washington 98032 (206)872-0218 seattle 1 March 31 1995I +, J tScott Woodbury City of Renton C Department of Public Works F ngineering Ue 200 Mill Ave S, 4th Floor ' Renton WA 98055 Subject: Mitigation Bank Site 2 Reconnaissance Level Hydrologic Analysis ' Dear Scott : ' We have completed our reconnaissance level review of the hydrologic benefits of the proposed Mitigation Bank Site 2 located between Oakesdale Avenue and SW 34th Street . As specified in our contract we have conducted flood frequency analyses of flows upstream of SW 34th Street ' and stage inundation analyses of simulated water levels near the location of the proposed bank for both current and future land-use scenarios. In addition, we have developed stage frequency and stage duration analyses of water levels in Springbrook Creek at the site of the proposed mitigation ' bank. The results of these analyses are shown in Figures 1 through 12 and Tables 1 through 6, and are discussed in greater detail below. ' Methodology: The HSPF User control input files (UCIs) developed by Northwest Hydraulic Consultants (NHC) ' for the present East Side Green River Watershed Project (ESGRWP) hydrologic analyses (City of Renton Contract CAG-90-033) provided the basis for this modeling effort. These were adapted as necessary to investigate the following four scenarios: 1 Current land-use without the proposed mitigation bank Future land-use without the proposed mitigation bank Current land-use with the proposed mitigation bank Future land-use with the proposed mitigation bank The first two scenario's, without the mitigation bank, correspond to the current and future hydrologic analyses being conducted for the ESGRWP. The HSPF models for those analyses were used directly without modification. Flows in Mill and Springbrook Creeks at their conflu- ence were extracted from hydrologic analyses currently being performed by NHC for the City of Kent. Current land-use/conveyance conditions overflows from Upper Springbrook Creek ' upstream of SR 167 into Springbrook Creek sub-basin S6 (SW 43rd Street basin) were also extracted from the City of Kent analyses and used as input to the HSPF simulations. ' RIVER ENGINEERING / HYDRAULIC MODEL TESTING / HYDRAULIC ANALYSIS AND DESIGN / COASTAL ENGINEERING HYDROLOGY / SEDIMENTATION ENGINEERING / NUMERICAL MODELING / APPLIED RESEARCH / FORENSIC ENGINEERING ' The final two scenario's, with the proposed mitigation bank, required modification of the Stage/Storage/Discharge relationship (FTABLE) for Springbrook Creek at SW 34th Street. The ' FTABLE was modified by adding the additional storage available in the mitigation bank to the previously computed storage in the channel (using NHC's most recent HEC-2 model) at the corresponding stage. Note that this manner of incorporating the mitigation bank storage is ' physically equivalent to having unconstrained inflows and outflows from the mitigation bank (i.e. no hydraulic losses). In actuality, the connections to and from the mitigation bank site would cause at least some head loss and the results would be affected accordingly. ' The final HSPF UCI files are provided in text form in Appendix A and digital form on the attached diskette. The HEC-2 input files for Springbrook Creek are also included on the diskette. ' Using these files, hydrologic simulations were run for each scenario for the period October 1961 through September 1991. Flows at the SW 34th Street culvert and stages upstream of SW 34th Street were computed and stored in a watershed data management (WDM) file. Annual peak ' stages and peak water surface elevations were extracted from the WDM file and analyzed to determine the 2-, 10-, 25-, and 100-year flow and stage quantiles. The stage data were also processed using an NHC developed stage duration program (ELDUR) to compute event-depth- duration information for each scenario for annual and seasonal periods. ' Peak Flow Analysis: Simulated annual peak flows at the SW 34th Street site were extracted from the WDM file and t analyzed using the Corps of Engineers HEC-FFA flood frequency program. Plots of the simulated flow data and computed Log Pearson Type III probability distribution are shown in Figures 1 through 4. Peak flow quantiles for the four scenarios are summarized in Table 1. Note ' that the HEC-FFA software does not allow plotting more than one data set per sheet. Therefore, comparative frequency plots were generated using NHC's own PLOT_CDF program. Simulated peak annual flows and fitted Log Pearson Type III distributions for current land-use with and ' without the mitigation bank are shown in Figure 5. A similar plot for the future land-use scenarios is provided in Figure 6. Digital copies of the HEC-FFA input, output and generated plot files are provided on the attached diskette. ' As shown in Figures 5 and 6 and Table 1, simulated peak flows are not significantly altered by the proposed mitigation bank. For current land-use conditions the mitigation bank would lower peak ' flow quantiles by 3 % to 4 % for return periods between 2- and 100-years. For future land-use conditions the change in theoretical peak flow quantiles ranges between a reduction of approxi- mately 10 % for the 2-year flow to an increase of approximately 6 % for the 100-year flow. Note that the increase in flood flow quantiles at higher recurrence intervals is an artifact of the theoretical frequency distribution and the relatively short simulated record. ' Review of the simulations for individual events show that the peak flow for each maximum annual event in the thirty year record is reduced at least slightly. However, peak flow reductions are ' most significant for moderate events, particularly those with recurrence intervals of approximately 2 years. Therefore, the theoretical frequency fit for the "with bank" condition is bowed slightly upward at the high end and extrapolations beyond the simulated data produce higher quantiles than those computed for the "without bank" scenario. Figure 7 shows the simulated reduction in 1 flow for each peak annual event in the simulation period. The event rankings from 1 to 30 correspond to recurrence intervals between about 1.03- and 55-years. ' Stage Event-Depth-Duration Analysis: The simulated time series of stages upstream of SW 34th Street were processed using an NHC stage analysis program, ELDUR. ELDUR reads the data in the WDM file and computes the total number of hours that the stage exceeded user defined limits. The program further computes the ' number of events of specified duration (in hours) for which the stage limits are exceeded. The output from ELDUR is a matrix of event-depth-duration data which facilitates comparison of the hydrologic performance of the wetland with and without the proposed bank. ' ELDUR analyses were run for the four scenarios for annual and seasonal periods. The three Y seasons investigated were from October 1 through December 31, March 1 through May 31, and ' July 1 through September 30. The results of these analyses are shown in Tables 2 through 5 (note that Tables 2 through 5 have multiple pages). Generally the water levels upstream of SW ' 34th Street would not rise as high nor remain high as long with the proposed bank. Specific comparisons can be made by comparing the results in Table 2 with those in Table 3 for the current land-use condition, and the results in Table 4 with the results in Table 5 for the future land-use ' condition. It is beyond NHC's area of expertise to interpret the wetland impacts of the hydrologic changes shown in Tables 2 through 5. Digital copies of the ELDUR input and output files are provided on the attached diskette along with a copy of the latest version of the ELDUR program. Peak Stage Analysis: In addition to the analyses described above, analysis of peak stages was conducted. Simulated annual peak stages at the SW 34th Street site were extracted from the WDM file and analyzed ' using NHC's PLOT_CDF flood frequency program. Plots of the simulated stage data and fitted Log Pearson Type III probability distribution are shown in Figures 8 and 9. Peak stage quantiles for the four scenarios are summarized in Table 6. ' As shown in Figures 8 and 9, simulated peak annual stages are reduced slightly by the proposed mitigation bank. For current land-use conditions the mitigation bank would lower peak stage ' quantiles by approximately 1 % for return periods between 2- and 100-years. The stage quantiles for the future land-use scenarios, shown in Table 6, show a similar increase at higher recurrence ' intervals to that shown in the flow analysis. As discussed above this is an artifact of the theoreti- cal distribution rather than an indication that peak stages will be increased with the proposed bank. ' Figure 10 shows the simulated change in peak annual stage for each event in the simulated record. In general, the proposed bank will cause somewhat lower peak stages (up to 0.9 feet) for events of about a 2-year recurrence but it will have very little impact on peak stages associated with the most severe events (i.e. the simulated stage for the January 9 1990 event for future land-use conditions is reduced by only 0.02 feet). This indicates that the additional volume provided by the ' mitigation bank is adequate for moderate events but is insignificant compared to the simulated storm runoff volume during severe events. ' Stage Duration Analysis: The final analysis conducted was duration analysis of simulated stages upstream of SW 34th Street. Using HSPF the simulated stage data was processed to compute the percentage of the simulation period that specified stages were exceeded. The results of this analysis were plotted as shown in Figures 11 and 12. Basically the mitigation bank will have an imperceptible effect on stage durations except at the highest stages (those attained less than 0.1 % of the time). Note that these stages are exceeded on average less than 10 hours per year. For the highest stages the ' duration at a given stage may be reduced by up to 15%with the proposed bank. For example, the future conditions without bank simulations show that a stage of 15 feet will be attained for approximately 69 hours over the 30 years. With the proposed mitigation bank this would be reduced to about 58 hours in the 30 years. Conclusions: The results of these analyses indicate that the proposed mitigation bank will have a relatively Y P P g Y minor hydrologic impact on streamflows and stages at SW 34th Street. Although the bank may provide some reduction in peak flow quantiles for moderate events, it is unlikely to have any discernible impact during severe storms. This is because the additional storage volume in the ' proposed bank is relatively small compared to the expected runoff volume during a significant event. The impact on stages will also be most pronounced during moderate events with very little reduction in peak stages during the most severe events. The stage duration analysis shows that ' the duration at the highest stages may be reduced slightly, although the reductions are of the order of several hours per year or less. Finally, note that although Tables 2 through 5 provide some indication of the expected wetland water levels in the proposed bank, the simplifying hydraulic assumptions, both in the use of the HSPF/HEC-2 models and the assumed connection to the stream channel need to be considered carefully when using this data. Sincerely NORTHWEST HYDRAULIC CONSULTANTS 0 Za'�X� Larry p M. 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Land-use Simulated Peak Flows in Mill Creek at SW 34th Street ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! 10000 + Without Mitigation Bank With Mitigation Bank - - 1000 -' c. co � ---- ** .� 0 ,Y M GJ d 100 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) East Side Green River - Wetland Mitigation Bank 2 Analyses c Future Land-use Simulated Peak Flows in Mill Creek at SW 34th Street CD East Side Green River - Wetland Mitigation Bank 2 Analyses Simulated Reduction In Peak Flows with Proposed Bank 80.00 ...........__..._..__..___......._---------------------. ._...__....__..._.......__....._..........._. 70.00 ®Change in Peak Flows for ---' Current Land-use Scenarios 0 Change in Peak Flows for 60.00 Future Land-use Scenarios — c 50.00 40.00 £ o � w i a 30.00 � f f I f 20.00 r i 10.00ME RN u ll 0.00 -10 1 _n 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 (0 Event Rank(30 is most severe event in record) C (D 19 i8 + Without Mitigation Bank With Mitigation Bank 17 16 15 14 ' z ' -•j ---- + + cu °' 13 + + M 12 4J cn cc I ---- ou a + 10 9 8 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) cc East Side Green River - Wetland Mitigation Bank 2 Analyses Current Land-use Simulated Peak Stages in Mill Creek at SW 34th Street m OD 19 18 + Without Mitigation Bank , With Mitigation Bank 17 16 , o cm 14 ' z , 13 ____ + 3E�E*** c, + 10 9 8 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) c East Side Green River - Wetland Mitigation Bank 2 Analyses Future Land-use Simulated Peak Stages in Mill Creek at SW 34th Street co East Side Green River - Wetland Mitigation Bank 2 Analyses Simulated Reduction In Peak Stage with Proposed Bank 0.90 ___........__.__.._...._...._......._.._..._.___......._-._._____._._._ _..----.-.------_.___._------ _.___.._'_......._..._.........._.._ .._.....__........__._.__.___._.__................_...._._......._......... i i 0.80 ■Change in Peak Stage for Current Land-use Scenarios r O Change in Peak Stage for Future Land-use 0.70 — Scenarios c 0.60 u 'O v 0.50 0.40 -- - a, 0.30 - € 0.20 f � 0.10 -n 0.00 �' cp 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 c Event Rank(30 is most severe event in record) (D 0 Average Hours Per Year Exceeded 088 0.876 8.76 87.6 876 8760 17.0 16.0 —• — Current LU without Mitigation Bank 15.0 --�E-• Current LU with Mitigation Bank 14.0 13.0 12.0 W > 11.0 Z 10.0 w 3" 9.0 &0 7.0 6.0 5.0 4.0 10-' 104 10-3 10-2 10-1 10, -n Exceedence Probability(p) tQ c -� ESGRW Mitigation Bank Site 2 -Wetland Stage Duration Analysis m Springbrook Creek at SW 34th Street -• Annual Comparison 1 Average Hours Per Year Exceeded .088 0.876 8.76 87.6 876 8760 17.0 16.0 .— Future LU without Mitigation Bank 15.0 -- -• Future LU with kVl itigation Bank 14.0 13.0 12.0 p 11.0 Z 10.0 9.0 8.0 7.0 6.0 5.0 + 4.0 10' 10-4 10-3 10-2 10 1 10� Exceerience Probability(p) cQ c cD ESGRW Mitigation Bank Site 2 - Wetland Stage Duration Analysis Springbrook Creek at SW 34th Street N Annual Comparison TABLES / Table 1 Peak Flow Analysis - Wetland Mitigation Bank Site 2 Peak Flow (cfs) at Return Period (yrs) ' Scenario 2 10 25 50 100 Current Land-use,No bank 355 570 698 803 917 Current Land-use,With bank 342 547 672 776 890 Change in Flow Quantile (%) -3.8% 40% -3.7% -3.4% -3.0% Future Land-use,No bank 585 824 930 1005 1076 Future Land-use,With bank 530 787 926 1033 1144 Change in Flow Quantile (%) -9.3% -4.5% -0.5% 2.8% 6.3% See Note Note: As described in the text of this letter,the increase in peak flow quantiles for infrequent events (i.e. recurrence interval greater than 25 years)are an artifact of the Log Pearson Type III statistical analysis of peak annual flows,rather than an indication that peak flows are expected to increase with the proposed project. For the largest flood flow in the simulated record(January 1990)the simulated peak discharge in the future land-use condition is reduced from 973 cfs to 954 cfs by the ' proposed mitigation bank. Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank DM filename: :\wetbank\wetbank.wdm Data Set number: 291 ..Elevation GREATER than or equal Critical lotal Hours Analysed: 262968 eriod of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 riticaL Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 of >= Critical 17.768 7.129 3.300 1.289 0.453 0.174 0.084 0.030 0.007 0.000 t >= Critical 46724 18748 8678 3389 1191 458 220 78 19 0 otal Events 1261 1106 575 232 86 35 17 10 4 0 Duration(hr) Events 3 1181 1866 527 166 76 31 16 8 3 -______ b 1181 866 419 166 65 21 14 5 1 9 1071 645 321 127 50 18 10 4 12 944 480 245 98 35 15 9 3 ------- ------- 15 797 381 181 74 27 12 ------- ------- ------- ------- 18 691 322 151 61 22 ------- 6 1 ------- ------- 21 594 263 118 50 18 9 ------- ------- ------- ------- 24 527 223 96 44 15 7 ------- ----- ------- ------- 27 475 189 82 37 12 5 ------- ------- ------- ------- 30 435 159 70 32 10 ------- ------- ------- ------- ------- 33 402 140 64 27 9 ------ ------- ------- ------- 36 368 126 55 25 7 ------- ------- --- ------- ------- 39 335 100 50 20 6 ------- 1 ------- ------- ------- 42 307 91 49 18 ------- ------- ------- ------- ------- ------- 45 291 83 39 13 3 ------- ------- ------- ------- ------- 48 278 70 32 12 ------- 2 ------- ------- ------- ------- 51 256 68 30 10 ------- ------- ------- ------- ------- ------- 54 245 63 ------- 8 ---- ------- ------- ------- -----•-- ------- 57 235 56 26 ------- 2 ------- ------- ------- ------- ------- 60 220 52 22 ------- ------ ------- ------- ------- ------- ------- 63 205 44 14 5 ------- ------- ------- ------- ------- ------- 66 191 40 12 ------- 1 ------- ------- ------- ------- ------- 69 186 38 10 3 ------- ------- ------- ------- ------- ------- 72 172 37 8 2 ------- ------- ------- ------- ------- ------- 75 166 29 6 ----- ------- ------- ------- ------- ------- ------- 78 160 27 ------- 1 ------- ------- ------- ------- ------- ------- 81 144 26 ------ - ------- ------- ------- ------- ------- ------- 84 139 22 4 ------- ------- ------- ------- ------- ------- ------- 87 130 17 3 ------- ------- ------- ------- ------- ------- ------- 90 126 15 2 ------- ------- ------- ------- ------- ------- ------- 93 121 14 ------- ------- ------- ------- ------- ------- ------- ------- 96 118 ------- ------- ------- ------- ------- ------- ------ ------- ------- 99 112 13 ------- ------- ------- ------- ------- ------- ------- ------- 102 102 12 ------- ------- ------- ------- ------- ------- ------- ------- 105 101 ------- ------- ------- ------- ------- ------- ------ 108 94 11 ------- ------- ------- ------- ------- ------- ------- ------- ill91 9 ------- ------- ------- ------- ------- ------- ------- ------- 114 83 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 79 ------- ------- ------- ------- ------- ------- ------ 120 74 ------- ------- ------- ------- ------- ------- ------ ------ 123 72 ------- ------- ------- ------- ------- ------- ------- ------ 126 68 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 65 ------- ------- ------- ------- ------- ------- ------ ------- ------- 1 32 62 5 ------- ------- ------- ------- ------- ------- ------ 135 61 ------- ------- ------- ------- ------- ------ 138 59 4 ------- ------- ------- ------- ------- ------- ------- ------- 144 56 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 54 ------- ------- ------- ------- ------- ------- ------ ------- ------- ' 153 51 - -- ------- ------- ------- 156 47 ------- ------- ------- ------- ------- ------- ------ ------- 159 42 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 41 2 ------- ------- ------- ------- ------- ------- ------- ------- ' 165 39 ----- ------- ------- ------- ------- ------- ------- ------- 168 37 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 33 ------- ------- ------- ------- ------- ------- ------ ------- ------- 177 31 1 ------- ------- ------- ------- ------- ------- ------- 189 29 ------- ------- ------- ------- ------- ------- ------- ------ 192 28 ------- ------- ------- ------- ------- ------- ------- 195 26 ------- ------- ------- ------- ------- ------- ------- 198 25 0 0 0 0 0 0 0 0 0 tTable 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank IDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 otElevation GREATER than or equal Critical al Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 tritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 27.867 11.866 5.818 2.409 0.790 0.270 0.107 0.032 0.008 0.000 t >= Critical 18459 7860 3854 1596 523 179 71 21 5 0 Total Events 527 478 260 121 45 16 7 3 1 0 Duration(hr) Events 3 524 454 237 100 38 14 7 3 1 ------- 6 489 375 184 83 31 9 6 2 ------- ------- 9 451 272 143 62 23 8 ------- ------- ------- ------- 12 399 199 113 46 14 7 3 1 ------- ------- 15 342 157 84 35 11 5 ------- ------- ------- 18 294 136 66 26 9 ------- 1 ------- ------- ------- 21 252 110 48 22 8 4 ------- ------- ------- ------- 24 213 92 38 20 6 2 ------- ------- ------- ------- 27 184 80 32 16 5 1 ------- ------- ------- ------- 30 173 66 ------- 14 4 ------- ------- ------- ------- ------- 33 162 60 28 12 3 ------- ------- ------- ------- ------- 36 149 51 23 11 ------- ------- ------- ------- ------- ------- 39 135 39 ------- 9 2 ------- ------- ------- ------- ------- 42 121 33 22 8 ------- ------- ------- ------- ------- ------- 45 115 31 19 5 1 ------- ------- ------- ------- ------- 48 112 ------- 15 4 ------- ------- ------- ------- ------- ------- 51 105 25 14 ------- ------- ------- ------- ------- ------- ------- 54 102 23 ------- 3 ------- ------- ------- ------- ------- ------- 57 95 ------- 11 ------- ------- ------- ------- ------- ------- ------- 60 87 21 8 --- ------- ------- ------- ------- ------- ------- 63 79 17 5 2 ------- ------- ------- ------- ------- ------- 66 73 ------- 4 ------- ------- ------- ------- ------- ------- ------- 69 70 16 ------- ------- ------- ------- ------- ------- ------- ------- ' 72 64 15 ----- ------- ------- ------- ------- ------- ------- ------- 75 62 12 3 ------- ------- ------- ------- ------- ------- ------- 78 60 11 ------- ------- ------- ------- ------- ------- ------- ------- 81 56 10 ------- ------- ------- ------- ------- ------- ------- ------- 84 54 9 ------- ------- ------- ------- ------- ------- ------- ------- ' 87 49 7 ------- ------- ------- ------- ------- ------- ------- ------- 90 47 ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 43 5 ------- ------- ------- ------- ------- ------- ------- ------- 96 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 37 ------- ------- ------- ------- ------- ------- ------- ------ 105 35 ----- ------- ------- ------- ------- ------- ------- ------- 108 32 ------- ------- ------- ------- ------- ------- ------- ------ ill31 4 ------- ------- ------- ------- ------- ------- ------- ------- 114 28 ------- ------- ------- ------- ------- ------- ------- ------ 117 25 ------- ------- ------- ------- ------ 120 24 ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------ 126 21 ------- ------- ------- ------- ------- ------- ------- ------ 129 20 ------- ------- ------- ------- ------- ------- ------- ------ 132 19 ------- ------- ------- ------- ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------- ------- ------- 138 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 16 ------- ------- ------- ------- ------- ------- ------- ------ 147 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 -- - ------- ------- ------- ------- ------- 159 ---- - 1 ------- ------- ------- ------- ------ ------- ------- 168 13 ------- ------- ------- ------- ------- ------- ------- ------ 177 10 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 9 ------- ------- ------- ------- ------- ------- ------ ------- ------- 192 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 7 0 0 0 0 0 0 0 0 0 ' Table 2 Event-Stage-Duration Analysis IDM filename: Current Land-use Without Mitigation Bank d:\wetbank\wetbank.wdm ata Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 It >= Critical 13.780 4.612 1.715 0.525 0.208 0.128 0.089 0.038 0.008 0.000 t >= Critical 9128 3055 1136 348 138 85 59 25 5 0 Total Events 294 202 90 24 6 3 2 2 1 0 Duration(hr) Events 3 294 187 81 21 6 ------- ------- 2 1 -- 6 274 153 59 16 ------- 3 ------- ------- ------- ------- 9 245 114 42 13 4 ------- ------- ------- ------- ------- 12 209 78 32 8 ------- ------- ------- ------- ------- ------- ' 15 175 62 20 6 3 ------- ------ ------- ------- 18 152 51 19 5 ------- ------- 2 1 ------- ------- 21 127 40 14 ------- ------- ------- ------ - -- ------- ------- 24 109 32 9 ------- ------- ------- ------- ------- ------- ------- ' 27 101 27 ------- ------- ------- 2 ------- ------- ------- ------- 30 93 23 ------- ------- ------- ------- ------- ------- ------- ------- 33 83 20 ------- ------- --- ------- ------- ------- ------- ------- 36 76 18 6 ------- ------- ------- ------- ------- ------- ------- 39 69 ------- ------- ------- 2 ------- 1 ------- ------- ------- 42 64 12 ------- 3 ---- ------ ------- ------- ------ 45 61 ------- ------- ------- ------- ------- -- 48 54 ------- ------- ------- ------- 1 ------- ------- ------- ------- 51 47 11 5 ------- ------- ------- ------- ------- ------- ------- 54 42 10 ------- 2 ------- ------- ------- ------- ------- ------- ' 57 41 9 4 ------- ------- ------- ------- ------- ------ 60 38 8 3 ------- ------- ------- ------- ------- ------- ------- 63 35 ------ - - ------- ------- ------- ------- ------- ------- ------- 66 ------- 7 ------- ------- 1 ------- ------- ------- ------- ------- 69 32 ------- 2 ------- ------- ------- ------- ------- ------- ------- 72 29 ------- ------- ---- ------- ------- ------- ------ 75 28 ------- ------- ------- -- ------- ------- 78 26 ------- ------- 1 ------- ------- ------- ------- ------- ------- 81 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 84 22 5 ------- ------- ------- ------- ------- ------- ------- ------- 93 20 ------ ------- ------- ------- ------- ------ 99 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 16 3 ------- ------- ------- ------- ------- ------- ------- ------- ' 105 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 14 2 ------- ------- ------- ------- ------- ------- ------- ------- 111 13 1 ------- ------- ------- ------- ------- ------- ------- ------- 117 12 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 9 ------- ------- ------- ------- ------- ------- ------- 129 8 ------- ------- ------- ------- ------- ------- ------- 138 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 195 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 3 0 0 0 0 0 0 0 0 0 ' Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank IDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 Elevation GREATER than or equal Critical otal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 3.137 1.135 0.471 0.155 0.027 0.002 0.000 0.000 0.000 0.000 t >= Critical 2078 752 312 103 18 1 0 0 0 0 Total Events 118 75 36 13 2 1 0 0 0 0 ' Duration(hr) Events 3 116 71 31 10 ------- ------- ------- ------- ------- ------- 6 108 51 24 8 ------- ------- ------- ------- ------- ------- 9 90 33 13 5 ------- ------- ------- ------- ------- ------- 12 78 20 9 4 ------- ------- ------- ------- ------- ------- 15 52 15 6 ------- 1 ------- ------- ------- ------- ------- ------18 40 12 4 ------- ------- ------- ------- ------- ------- 21 28 8 ------- 1 ------- ------- ------- ------- ------- ------- 24 24 ------- 2 ------- ---- -- ------- ------- ------- ------- ------- 27 21 4 1 ------- ------- ------- ------- ------- ------- ------- ' 30 15 2 ------- ------- ------- ------- ------ 33 10 ------- ------- ------- ------- ------- ------ 36 9 1 ------- ------- ------- ------- ------- ------- ------- ------- 39 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- 1 9" 0 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank DM filename: :\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical otal Hours Analysed: 262968 eriod of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 riticaL Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 17.765 7.202 3.290 1.263 0.449 0.171 0.084 0.028 0.006 0.000 �t >= Critical 46716 18938 8651 3320 1180 450 220 73 15 0 total Events 1261 1101 550 201 75 27 15 7 3 0 Duration(hr) Events 1 3 1250 1049 510 190 72 24 15 7 3 ------- 6 1184 877 412 158 61 21 14 6 1 ------- 9 1069 655 320 128 49 18 10 4 ------- ------- 12 940 492 247 100 35 17 9 3 ------- ------- 15 798 386 185 75 30 14 ------- ------- ------- ------- 18 691 324 152 61 22 10 6 ------ ------- ------- 21 593 266 122 49 18 9 2 1 -- ------- 24 526 230 100 45 15 7 ------- ------- ------- ------- 27 474 189 84 38 12 5 ------- ------- ------- ------- 30 434 161 72 34 11 4 ------- ------- ------- ------- ' 33 3 141 64 28 9 ------- ------- ------- ------- 36 363 63 128 55 25 7 ------- 39 332 103 52 20 b 1 42 306 94 49 17 ------- ------- ------- ------- ------- ------- 45 290 84 41 13 3 ------- ------- ------- ------- ------- ' 48 276 71 36 12 ------- 2 ------- ------- ------- ------- 51 257 68 33 10 ------- 1 -- ------- ------- ------- 54 245 64 28 9 ------- ------- ------- ------- ------- ------- 57 234 58 27 ------- 2 ------- ------- ------- ------- ------- 60 2111 51 23 ------- ------- ------- ------- ------- ------- ------- 63 201 44 14 5 ------- ------- ------- ------- ------- ------- 66 187 41 13 ------- 1 ------- ------- ------- ------- ------- 69 183 38 9 4 ------- ----- ------- ------- ------- ------- 72 171 37 8 3 ------- ------- ------- ------- ------- ------- 75 165 29 7 ------- ------- ------- ------- ------- ------- ------- 78 159 27 ----- ------- ------- ------- ------- ------- ------- ------- 81 145 26 ------- 1 ---- ------- ------- ------- ------- ------- 84 138 21 4 ------- ------- ------- ------- ------- ------- ------- 87 128 18 3 ------- ------- ------- ------- ------- ------- ------- ' 90 125 15 2 ------- ------- ------- ------- ------ ------- 93 122 ------- ------ ------- ------- ------ 96 117 14 ------- ------- ------- ------- ------- ------- ------ 99 ill 13 ------- ------- ------- ------- ------- ------- ------- ------- 102 104 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 105 102 12 ------- ------- ------- ------- ------- ------- ------- ------- 108 93 10 ------- ------- ------- ------- ------- ------- ------- ------- ill90 9 ------- ------- ------- ------- ------- ------- ------- ------- 114 85 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 80 ------- ------- ------- ------- ------- ------ 120 75 ------- ------- ------- ------- ------ 123 72 ------- ------- ------- ------- ------- 126 68 ------- ------- ------- ------- ------ ------- ------- ------- ------- 129 67 5 ------- ------- ------- ------- ------- ------- ------- ------- 132 63 ------ ------- ------- ------- ------ 135 62 ------- ------- ------- ------- ------- ------- ------- ------- ---- -- 138 60 4 ------- ------- ------- ------- ------- ------- ------- ------- 141 57 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 56 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 147 55 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 52 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 50 3 ------- ------- ------- ------- ------- ------- ------- ------- 156 48 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 43 ------- 1 ------- ------- ------- ------- ------- ------- ------- ' 162 42 2 ------- ------- ------- ------- ------- ------- ------- ------- 165 40 ----- ------- ------- ------- ------- ------- ------- ------ 168 39 ------- ------- ------- ------- ------- ------- ------- ------ 171 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 32 1 ------- ------- ------- ------- ------- ------- ------- ------- 180 ------ -- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 189 30 ------- ------- ------- ------- ------ 192 28 ------- ------- ------- ------ 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 26 0 0 0 0 0 0 0 0 0 ' Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank 41DM filename: d:\uetbank\uetbank.udm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 27.874 12.024 5.797 2.355 0.767 0.258 0.112 0.027 0.006 0.000 t >= Critical 18464 7965 3840 1560 508 171 74 18 4 0 Total Events 531 476 249 103 36 13 7 2 1 0 ' Duration(hr) Events 3 524 456 229 94 35 10 7 ------- 1 ------- 6 490 378 182 79 29 9 6 2 ------- ------- 9 454 278 146 63 22 8 ------- ------- ------- ------- 12 397 207 115 49 15 7 3 1 ------- ------- 15 341 157 85 36 13 6 ------- ------- ------- ------- 18 294 138 69 27 9 ------- ------- ------- ------- 21 252 113 50 22 8 4 1 ------- ------- ------- 24 213 97 39 20 6 2 ------- ------- ------- ------- 27 187 81 33 17 ------- ------- ------- ------- ------- ------- 30 171 68 29 16 5 1 ------- ------- ------- ------- 33 160 61 28 12 3 ------- ------- ------- ------- ------- 36 148 52 23 11 ------- ------- ------- ------- ------- ------- 39 135 42 22 9 2 ------- ------- ------- ------- ------- 42 122 36 21 7 ------- ------- ------- ------- ------- ------- ' 45 116 32 20 5 1 ------- ------- ------- ------- ------- 48 113 26 17 4 ---- ------- ------- ------- ------- ------- 51 107 25 15 ------- ------- ------- ------- ------- ------- ------- 54 102 24 ------- 3 ------- ------- ------- ------- ------- ------- ' 57 97 ------- 11 ------- ------- ------ ------- ------- ------- ------- 60 91 21 8 ----- ------- ------- ------- ------- ------- ------- 63 79 ------- 5 2 ------- ------- ------- ------- ------- ------- 66 71 17 4 ------- ------- ------- ------- ------- ------- ------- 69 69 16 ------- ------- ------- ------- ------- ------- ------- ------- ' 72 63 15 ------- 1 ------- ------- ------- ------- 75 61 12 3 ------- ------- ------- ------- ------- ------- 78 59 ------ ------ ------- ------- ------- 81 56 11 ------- ------- ------- ------- ------- ------- ------- ------- 84 54 8 ------- ------- ------- ------- ------- ------- ------- ------- ' 87 49 7 ------- ------- ------- ------- ------- ------- 90 46 ----- ------- ------- ------- ------- ------- 93 44 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 42 5 ------- ------- ------- ------- ------- ------- ------- ------- 99 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 102 36 ------- ------- ------- ------- ------- ------- ------- ------- ------- 35 ------- ------- ------- ------- ------- ------- ------- ------- 108 31 ------- ------- ------- ------- ------- ------- ------- ------- ill29 4 ------- ------- ------- ------- ------- ------- ------- ------- 114 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 1 29 20 ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 144 16 ------- ------- ------- ------- ------- ------- --- 147 15 ------- ------- ------- ------- ------- 150 14 ------- ------- ------- ------- ------- ------- ------- ------- ---- 153 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 156 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 --- ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 ---- ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 ------- ------- ------- ------- ------- ------- ------- ----------- 174 ------- ------- --- ------- ------- ------- ------- ------- ------ 177 10 1 --- ------- ------- ------- ------- ------- ------- ------- 180 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 1 186 ------- ------- ------- ------- ------- 189 9 ------- ------- ------- ------- ------- 192 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 7 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank IMM filename: d:\wetbank\wetbank.wdm Data Set number: 591 Elevation GREATER than or equal Critical otal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 13.767 4.633 1.698 0.525 0.205 0.131 0.089 0.042 0.006 0.000 t >= Critical 9119 3069 1125 348 136 87 59 28 4 0 Total Events 294 198 84 22 6 3 2 2 1 0 ' Duration(hr) Events 3 292 185 80 20 5 ------- ------- 1 ------- 6 274 153 57 16 4 3 ------- 2 ------- ------- 9 242 114 40 13 ------- ------- ------- ------- ------- ------- 12 208 79 31 8 ------- ------- ------- ------- ------- ------- I 15 179 64 21 6 3 ------- ------- ------- 18 154 50 18 5 ------- ------- 2 ------- ------- ------- 21 127 41 15 ------- ------- ------- -- 1 ------- ------- 24 109 33 11 ------- ------- ------- ------- ------- ------- ------- 27 99 27 7 ------- ------- ------- ------- ------- ------- ------- ' 30 92 23 ------- ------- ------- 2 ------- ------- ------- ------- 33 83 20 ------- ------- ------- ------- ------- ------- ------- ------- 36 74 18 ------- ------- ------- ------- ------- ------- ------- ------- 39 70 ------- 6 ------- 2 ------- 1 ------- ------- ------- 42 64 12 ------- 3 ------- ------- ------- ------- ------- ------- 45 61 ------- ------- ------- ------- ----- ------- ------ 48 53 ------- ------- ------ ------- ------- ------- ------- 51 48 11 5 ------- ------- 1 ------- ------- ------- ------- 54 44 ------- ------- 2 ------- ------- ------- ------- ------- ------- ' 57 41 10 4 ------- ------- ------- ------- ------- ------- ------- 60 35 8 3 ------- ------- ------- ------- ------- ------- ------- 63 34 ------- - ------- ------- ------- ------- 66 ------- 7 2 ------- 1 ------- ------- ------- ------- ------- 69 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 72 29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 28 ------- ------- ------- ------- ------- ------- ------- ------- 78 26 ------- ------- ------- ------- ------- ------- ------- 81 ------- ------- ------- 1 ------- ------- ------- ------- ------- ------- 84 23 5 ------- ------- ------- ------- ------- ------- ------- ------- 87 ------- 4 ------- ------- ------- ------- ------- ------- ------- ------- 90 21 ----- 1 ------- ------- ------- ------- ------- ------- ------- 93 20 ------- - --- ------- ------- ------- ------- ------- ------- ------- 96 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 102 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 16 3 ------- ------- ------- ------- ------- ------- ------- 108 14 2 ------- ------- ------- ------- ------- ------- ---- ill13 1 ------- ------- ------- ------- ------- ------- ------- ------- 117 -----12 ------- ------- ------- ------- ------- ------- ------- 120 10 ------- ------- ------- ------- ------- ------- ------- ------- 123 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------ 126 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 8 ------- ------- ------- ------- ------- ------- ------- 132 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 144 ------- ------- ------- ------- ------- ------- ------- ---- ------- ------- ------- ------- ------- 150 5 ------- ------- ------- ------- ------- ------- ------- ------- 153 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 159 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 162 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 ------- ------- ------- ------- ------ ------- ------- ------- ------- ------- ' 174 ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 180 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 192 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 4 192 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 3 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank IMM filename: d:\wetbank\wetbank.wdm ata Set number: 591 ..Elevation GREATER than or equal Critical otal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 3.148 1.156 0.476 0.146 0.026 0.000 0.000 0.000 0.000 0.000 t >= Critical 2085 766 315 97 17 0 0 0 0 0 Total Events 116 73 36 11 1 0 0 0 0 0 Duration(hr) Events 3 116 69 28 10 ------- ------- ------- ------- ------- ------- 6 108 57 24 8 ------- ------- ------- ------- ------- ------- 9 91 36 13 5 ------- ------- ------- ------- ------- ------- 12 77 21 10 2 ------- ------- ------- ------- ------- ------- 15 53 16 6 ------- 1 ------- ------- ------- ------- 18 39 12 4 ------- ------ ------- ------- ------- ------- ------- 21 28 7 ------- ------- ------- ------- ------- ------- ------- - 24 25 4 3 1 ------- ------- ------- ------- ------- ------- 27 21 3 1 ------- ------- ------- ------- ------- ------- ------- 30 17 ---- ------- ------- ------- ------- ------- ------- ------- --- 33 10 ------- ------- ------- ------- ------- ------- ------- ------ 36 9 2 ------- ------- ------- ------- ------- ------- ------- ------- 39 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 51 ------- ------- ------- ------- ------- ------- ------- ------- ------- 54 ------- ------- ------- ------- ------- ------- ------- ------- ' 57 ----- ------- ------- ------- ------- ------- ------- ------- 60 ----- ------- ------- ------- ------- ------- ------- ------- 63 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- bb ------- ------- ------- ------- ------- ------- ------- ------- 69 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 ----- ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 ---- ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- 84 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 87 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 90 ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 99 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 ------- ------ ------- -- ---- ------- ------- ------- ------- ------- ------- ill ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 114 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 ------- ------- ------- ------- ------- ------- ------- ------- ------ 150 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------ ------- ------- ------- ------- ------- ------- ------- ------- - ----- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 171 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 177 180 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 192 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 0 0 0 0 0 0 0 0 0 0 ' Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 /t >= Critical 18.997 8.649 4.814 2.732 1.306 0.581 0.253 0.123 0.043 0.005 t >= Critical 49956 22744 12658 7184 3435 1528 666 323 112 14 Total Events 1491 1486 1086 693 352 173 92 48 19 2 Duration(hr) Events ' 3 1482 1405 969 608 298 146 66 32 15 -_--_-- 6 1400 1177 711 437 205 91 41 17 6 2 9 1271 865 495 282 139 62 26 14 5 12 1093 616 348 198 99 42 15 10 4 ------- 15 922 464 253 137 68 27 13 8 1 ------- 18 681 3 1 96 50 22 10 ------3 ------- ------- 21 81 303 03 155 55 76 35 17 7 24 599 246 123 59 26 12 4 27 536 204 96 49 23 9 ------- ------- ------- ------- 30 483 181 79 44 19 5 ------- ------- ------- ------- ' 33 434 153 65 36 16 --- ------- ---- ------- ------- 36 399 128 54 26 12 4 ------ ------- ------- 39 362 103 48 25 6 ------- ------- 1 ------- ------- 42 334 93 41 22 5 ------- 1 ------- ------- ------- 45 3011 81 32 16 4 ------- ------- ------- ------- ------- 48 282 72 27 11 ------- 2 ------- ------- ------- ------- 51 264 67 ------- 9 3 --- ------- ------- ------- ------- 54 251 62 23 7 ------- ------- ------- ------- ------- ------- 57 236 54 21 ------- 2 ------- ------- ------- ------- ------- 60 221 46 16 5 ------- ------- ------- ------- ------- ------- 63 207 43 13 ------- ------- ------- ------- ------- ------- ------- 66 194 41 8 4 ------- ------- ------- ------- ------- ------- 69 184 39 6 2 ------- ------- ------- ------- ------- ------- 72 175 37 5 1 ------- ------- ------- ------- ------- ------- 75 166 30 ----- ------- ------- ------- ------- ------- ------- ------- 78 153 27 4 ------- ------- ------- ------- ------- ------- ------- 81 147 22 ------- ------- ------- ------- ------- ------- ------- ------- 84 139 18 3 ------- ------- ------- ------- ------- ------- ------- 87 134 14 ------- ------- ------- ------- ------- ------- ------- ------- ' 90 123 11 ------- ------- ------- ------- ------- ------- ------- ------- 93 116 10 ------- ------- ------- ------- ------- ------- ------- ------- 96 ill 9 ------- ------- ------- ------- ------- ------- ------- ------- 99 98 8 ------- ------- ------- ------- ------- ------- ------- ------- 102 93 7 ------- ------- ------- ------- ------- ------- ------- ------- 105 90 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 86 6 ------- ------- ------- ------- ------- ------- ------- ------- ill77 5 ------- ------- ------- ------- ------- ------- ------- ------- 114 73 ------- ------- ------- ------- ------- ------- ------- ------- ------- 1 17 69 ------- ------- ------- ------- ------- ------- ------- ------ 123 67 ------- ------- ------- ------- ------- ------- ------ 126 65 4 ------- ------- ------- ------- ------- ------- ------- ------- 129 61 3 ------- ------- ------- ------- ------- ------- ------- ------- 132 60 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 58 ------- ------- ------- ------- ------- ------- ------- 141 53 ------- ------- ------- ------- ------- ------- ------- 144 51 ------- ------- ------- ------- ------- ------ ------- ------- ------- 147 47 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 43 ------- ------- ------- ------- ------- ------- ------ ------- ------- 153 41 ------ ------- ------- ------- ------- ------- ------- ------- 156 38 ------- ------- -- ------- ------- ------- ------- ------- ------- 159 37 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 174 33 ------- ------- ------- ------- ----- ------ ------ ------ ------- 168 31 171 29 174 27 177 26 2 ------- ------- ------- ------- ------- ------- ------- ------- 1110 25 ------ ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- 1 ------- ------- ------- ------- ------- 186 24 ------- ------- ------- ------- ------- ------- ------ 189 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 19 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank IDM filename: d:\wetbank\wetbank.wdm Data Set number: 391 Elevation GREATER than or equal Critical otal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 30.821 14.899 8.690 5.270 2.662 1.205 0.492 0.225 0.074 0.011 I 1 t >= Critical 20416 9869 5756 3491 1763 798 326 149 49 7 Total Events 600 631 471 317 180 95 52 26 9 1 ' Duration(hr) Events 3 598 596 426 286 150 80 37 19 7 ------- 6 569 508 318 212 107 53 19 ------- 3 1 9 527 385 225 138 76 32 10 7 2 ------- 12 454 271 157 104 50 21 7 5 1 ------- ' 15 391 199 126 72 32 13 6 3 ------- ------- 18 338 161 90 49 24 11 4 1 ------- ------- 21 291 131 72 37 18 7 3 ------- ------- ------- 24 257 107 55 26 14 5 2 ------- ------- ------- 27 222 93 42 24 13 4 ------- ------- ------- ------- ' 30 201 85 34 22 10 ------- ------- ------- ------- ------- 33 178 69 29 19 9 ------- ------- ------- ------- ------- 36 174 57 26 ----- 8 2 ------- ------- ------- ------- 39 158 46 24 15 ------- ------- ------- ------- ------- ------- 42 149 40 20 12 3 ------- ------- ------- ------- ------- 45 137 35 16 7 2 ------- ------- ------- ------- ------- 48 125 30 14 ------- ------- -- ------- ------- ------- ------- 51 114 28 ------- 5 1 ------- ------- ------- ------- ------- 54 106 25 ------- 4 ------- ------- ------- ------- ------- ------- 57 101 22 10 ------- ------- ------- ------- ------- ------- ------- 60 94 ------- 9 2 ------- ------- ------- ------- ------- ------- 63 86 20 6 ------- ------- ------- ------- ------- ------- ------- 66 79 19 4 1 ------- ------- ------- ------- ------- ------- 69 75 18 2 ------- ------- ------- ------- ------- ------- ------- 72 71 17 ------- ------- ------- ------- ------- ------- ------- ------- 75 69 14 ------- ------- ------- ------- ------- ------- ------- ------- 78 66 12 ------- ------- ------- ------- ------- ------- ------- ------- 81 62 9 ------- ------- ------- ------- ------- ------- ------- ------- 84 55 8 ------- ------- ------- ------- ------- ------- ------- ------- ' 87 54 6 ------- ------- ------- ------- ------- ------ 90 50 3 ------- ------- ------- ------- ------- ------ 93 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 43 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 102 35 ----- ------- ------- ------- ------- ------- ------- ------- ----- 105 33 ------- ------- ------- ------- ------- ------- ------- ------- ------ 108 32 2 ------- ------- ------- ------- ------- ------- ------- ------- ill28 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 114 25 - - - - -- ---- ---- - - -- - -- ------ 117 24 ------- ------- ------- ------- ------- ------- ------- ------ 123 23 ------- ------- ------- ------- ------- ------- ------- ------- 126 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 1 35 18 ------- ------- ------- ------- ------ 147 15 ------- ------- ------- ------- ------- 150 14 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 165 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 12 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 11 174 10 177 9 1 ------- ------- ------- ------- ------- ------- ------ ------- 189 8 ------- ------- ------- ------- ------ 192 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 5 0 0 0 0 0 0 0 0 0 ' Table 4 Event-Stage-Duration Analysis IOM filename: Future Land-use Without Mitigation Bank d:\uetbank\uetbank.udm ata Set number: 391 ..Elevation GREATER than or equal Critical otal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 14.444 5.670 2.791 1.327 0.480 0.214 0.131 0.092 0.035 0.000 t >= Critical 9568 3756 1849 879 318 142 87 61 23 0 Total Events 358 289 186 109 33 14 5 3 3 0 ' Duration(hr) Events 3 355 273 170 91 27 12 5 ------- 2 --- 6 328 212 121 53 18 5 4 ------- ------- ------- 9 289 147 68 31 11 ------- ------- ------- ------- ------- 12 247 106 47 20 9 4 ------- ------- ------- ------- 15 202 73 30 12 6 ------- ------- ------- 1 ------- 18 165 52 24 7 3 ------- ------- 2 - - ------- 21 143 44 20 5 ------- ------- ------- ------- ------- ------- 24 121 35 13 4 ------- ------- 2 ------- ------- ------- 27 109 28 9 ------- ------- ------- ------- ------- ------- ------- 30 96 25 7 ------- ------- 2 ------- ------- ------- ------- 33 83 21 5 ------- ------- ------- ------- ------- ------- ------- 36 74 16 ------- ------- ------- ------- ------- ------- ------- ------- 39 67 ------- ------- ------- 2 ------- ------- 1 ------- ------- 42 63 11 ------ ------- ---- 1 ------- ------- ------- 45 55 ---- 4 3 ------ ------- ------- ------- ------- 51 45 ------- ----- ------ ------- ------- ------ 54 43 10 3 ------- ------- ------- ------- ------- ------- ------- 57 39 8 ------- ------- 1 ------- ------- ------- ------- ------- 60 35 7 ------- ------- ----- ------- ------- ------- ------- ------- 63 34 ------- 2 ------- ------- ------- ------- ------- ------ 66 31 ------- ------- ------- ------- ------- ------- ------- ------ 69 27 ------- ------- ------- ------- ------- ------- ------- ------ 72 26 ------- ------- 1 ------- ------- ------- ------- ------- ------- 75 24 6 ------- - ------- ------- ------- ------- ------- ------- 78 21 5 ------- ------- ------- ------- ------- ------- ------- ------- 81 ------- 4 ------- ------- ------- ------- ------- ------- ------- ------- 84 20 ------- 1 ------- ------- ------- ------- ------- ------- ------- ' 87 19 ------ ------- ------- ------- ------- 93 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 96 16 ------- ------- ------- ------- ------- ------- ------- ------ 99 12 1 ------- ------- ------- ------- ------- ------- ------- ------- 105 11 ------- ------- ------- ------- 108 10 ------- ------- ------- ------ -- 123 9 ------- ------- ------- ------ 126 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 7 ------- ------- ------- ------- ------- ------- ------ ------- ------- 135 6 ------- ------- ------- ------- ------- ------- ------ ------- 141 5 ------- ------- ------- ------- ------ 147 4 ------- ------- ------- ------- 186 3 ------- ------- ------- ------ ------- ------- ------- ------- ------- 198 2 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis � filename: Future Land-use Without Mitigation Bank M d:\wetbank\wetbank.wdm ata Set number: 391 ..Elevation GREATER than or equal Critical otal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 It >= Critical 4.185 1.801 0.974 0.548 0.261 0.116 0.024 0.009 0.000 0.000 t >= Critical 2772 1193 645 363 173 77 16 6 0 0 Total Events 152 112 81 50 26 15 6 2 0 0 Duration(hr) Events 3 147 104 68 41 19 11 ------- 1 --- ------- 6 134 85 45 27 12 ------- ------- ------- ------- ------- 9 122 54 27 16 6 3 1 ------- ------- ------- 12 95 33 18 8 5 ------- ------- ------- ------- ------- 15 72 24 9 5 3 ------- ------- ------- ------- ------- 18 50 20 6 3 ------- 1 ------- ------- ------- ------- 21 40 16 4 ------- 1 ------- ------- ------- ------- ------- 24 31 9 ------- 1 ------- ------- ------- ------- ------- ------- 27 26 5 ---- -3 ------- ------- ------- ------- ------- ------- ------- 30 23 4 2 ------- ------- ------- ------- ------- ------- ------- 33 20 ------ ------- ------- ------- ------- ------- ------- ------- 36 14 ------- ------- ------- ------- ------- ------- ------- ------- ------- 39 11 2 ------- ------- ------- ------- ------- ------- ------- ------- ' 45 8 ------- ------- ------- ------- ------- ------ ------- 54 7 ------- ------- ------- ------- ------- ------- ----- 75 5 ------- ------- ------- ------- ------ 84 4 ------- ------- ------- ------- ------ ------- ------- ------- ------- 87 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 198 0 0 0 0 0 0 0 0 0 0 ' Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank UM filename: .\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical otaL Hours Analysed: 262968 eriod of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 18.979 8.845 4.875 2.698 1.269 0.564 0.243 0.110 0.034 0.005 t >= Critical 49908 23260 12821 7095 3338 1482 638 289 90 12 otal Events 1485 1483 1033 600 291 138 65 31 13 2 Duration(hr) Events ' 3 1412 1211 723 432 20 121 58 24 -- - -__ 6 1412 1211 723 432 205 93 43 16 2 9 1273 899 507 293 140 63 28 13 5 12 1094 640 358 204 99 46 18 11 3 15 917 474 263 145 68 29 15 8 1 ------- 18 777 375 198 105 51 24 13 5 ------- ------- 21 678 309 163 81 38 18 8 2 ------- ------- 24 599 252 133 62 31 17 4 ------- ------- ------- 27 533 208 102 53 26 11 ------- ------- ------- ------- 30 482 187 85 46 21 7 ------- ------- ------- ------- ' 33 437 155 69 40 18 5 ------- ------- ------- ------- 36 399 131 56 ------- 16 4 ------ ------- ------- 39 364 108 48 28 8 ------- ------- 1 ------- ------- 42 341 95 41 23 5 ------- 1 ------- ------- ------- 45 308 84 32 17 ------- ------- ------- ------- ------- ------- 48 286 73 28 11 4 2 ------- ------- ------- ------- 51 265 66 ------- 9 3 1 ------- ------- ------- ------- 54 249 62 23 7 ------ ------- ------- ------- ------- 57 236 55 21 ------- 2 ------- ------- ------- ------- ------- 60 222 46 16 5 1 ------- ------- ------- ------- ------- ' 63 209 43 15 ------- ------- ------- ------- ------- ------- ------- 66 196 40 10 4 ------- ------- ------- ------- ------- ------- 69 182 39 6 3 ------- ------- ------- ------- ------- ------- 72 174 36 5 2 ------- ------- ------- ------- ------- ------- ' 75 163 30 ------- 1 ------- ------- ------- ------- ------- ------- 78 153 28 4 ------- ------- ------- ------- ------- ------- ------- 81 147 23 ------- ------- ------- ------- ------- ------- ------- ------- 84 141 20 3 ------- ------- ------- ------- ------- ------- ------- 87 131 15 ------- ------- ------- ------- ------- ------- ------- ------- 90 125 13 ------- ------- ------- ------- ------- ------- ------- ------- 93 116 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 107 11 ------- ------- ------- ------- ------- ------- ------- ------- 99 101 10 ------- ------- ------- ------- ------- ------- ------- ------- 102 93 8 ------- ------- ------- ------- ------- ------- ------- ------- 105 91 7 ------- ------- ------- ------- ------- ------- ------- ------- 108 88 6 ------- ------- ------- ------- ------- ------- ------- ------- 111 79 5 ------- ------- ------- ------- ------- ------- ------- ------- 114 76 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 70 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 68 ------- ------- ------- ------- ------- ------- ------- ------- 123 67 ------- ------- ------- ------- ------- ------- ------- ------- 126 65 ------- ------- ------- ------- ------- ------- ------- ------ 129 62 4 ------- ------- ------- ------- ------- ------- ------- ------- 132 60 3 ------- ------- ------- ------- ------- ------- ------- ------- 135 57 - -- ------- ------- ------- ------- ------- ------- ------- ------- 138 54 ------- ------- ------- ------- ------- ------- ------- ------ 141 53 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 51 ------- ------- ------- ------- ------ ------- ------- ------- ------- 147 46 ------- ------- ------- ------- ------- ------- ------- ------ 150 45 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 37 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 36 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 180 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 186 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 189 21 ------- ------- ------- ------- ------- ------- ------ 195 20 ------- ------- ------- ------- ------- ------- 198 17 0 0 0 0 0 0 0 0 0 ' Table 5 Event-Stage-Duration Analysis IWDM filename: Future Land-use With Mitigation Bank d:\wetbank\wetbank.wdm ,Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 I%t >= Critical 30.803 15.219 8.827 5.232 2.600 1.164 0.473 0.192 0.059 0.009 t >= Critical 20404 10081 5847 3466 1722 771 313 127 39 6 Total Events 599 629 447 284 151 76 36 17 6 1 Duration(hr) Events 3 598 603 421 269 140 66 32 11 6 ------- 6 570 520 324 204 108 52 22 7 ------- 1 9 525 398 232 141 76 33 12 ------- 2 ------- 12 453 284 163 107 53 24 9 6 1 ------- 15 391 165 194 73 32 12 7 2 -____-- -_--_-_ 18 336 165 94 54 24 12 6 2 21 292 134 75 41 18 9 3 1 24 258 112 59 28 15 8 2 ------- ------- ------- 27 222 96 43 25 13 5 ------- ------- ------- ------- ' 30 201 88 36 23 12 4 ------- ------- ------- ------- 33 182 71 30 22 10 3 ------- ------- ------- ------- 36 173 58 27 ------- 9 2 ------- ------- ------- ------- 39 159 48 24 16 5 ------- ------- ------- ------- ------- 42 151 40 20 12 3 ------- ------- ------- ------- ------- 45 138 36 16 8 ------- ------- ------- ------- ------- ------- 48 127 31 14 ------- 2 ------- ------- ------- ------- ------- 51 114 28 ------- 5 1 ------- ------- ------- ------- ------- 54 106 25 ------- 4 ------- ------- ------- ------- ------- ------- 57 100 23 10 ------- ------- ------- ------- ------- ------- ------- 60 93 ------- 9 2 ------- ------- ------- ------- ------- ------- 63 85 20 8 ------- ------- ------- ------- ------- ------- ------- 66 78 19 4 ------- ------- ------- ------- ------- ------- ------- 69 74 18 2 ------- ------- ------- ------- ------- ------- ------- ' 72 69 16 ------ ------- ------- ------- ------- ------- ------- 75 66 14 ------- 1 ------- ------- ------- ------- ------- ------- 78 63 12 ------ -- ------- ------- ------- ------- ------- ------- 81 61 ------- ------- ------- ------- ------- ------ ------- ------- ------- 84 56 9 ------- ------- ------- ------- ------- ------- ------- ------- 87 53 6 ------- ------- ------- ------- ------- ------- ------- ------- 90 50 4 ------- ------- ------- ------- ------- ------- ------- ------- 93 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 40 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 39 ------- ------- ------- ------- ------- ------- 102 35 ------- ------- ------- ------- ------- ------ 105 33 ------- ------- ------- ------- ------- ------ 108 32 2 ------- ------- ------- ------- ------- ------- ------- ------- ill29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 27 ------- ------- ------- ------- ------- ------- ------- 120 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 20 ------- ------- ------- ------- ------- ------- ------- ------- ----- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ----- 135 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- ' 168 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 10 ------- ---- ------- ------- ------- ------- ------- ------- ------- 177 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 180 9 ------- ------- ------- ------- ------- ------- ------- ------- ------0 8 ------- ------- ------- ------- ------- ------- ------- ------ 195 6 ------- ------- ------- ------- ------- ------- ------- ------ 198 4 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis IDM filename: Future Land-use With Mitigation Bank d:\wetbank\wetbank.wdm ata Set number: 691 ..Elevation GREATER than or equal Critical otal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 Iritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 14.417 5.821 2.820 1.292 0.459 0.207 0.130 0.091 0.030 0.000 t >= Critical 9550 3856 1868 856 304 137 86 60 20 0 Total Events 354 283 181 89 23 11 5 2 2 0 Duration(hr) Events 3 349 273 167 83 22 9 5 ------- 2 ------- 6 329 222 122 56 18 6 4 ------- ------- 9 291 155 70 32 11 ------- ------- ------- ------- ------- 12 246 108 46 22 7 4 ------- ------- ------- ------- ' 15 200 73 32 15 5 ------- ------- -- 1 ------- 18 167 52 24 10 ----- ------- ------- 2 ------- ------- 21 139 43 21 6 ------- ------- ------ ---- ---- ------- 24 121 34 14 ------- ------- ------- 2 ------- ------- ------- 27 106 27 10 4 ------- ------- ------- ------- ------- ------- ' 30 95 25 7 ------- ----- 2 ------- ------- ------- ------- 33 84 21 5 ------ ------- ------- ------- ------- ------- 36 74 17 ------- ------- 3 ------- ------- ------- ------- ------- 39 67 ------- ------- ------- 2 ------- ------- 1 ------- ------- 42 64 12' ------- ------- ------- ------- 1 ------- ------- ------- ---- 45 54 11 ------- 3 --- ------- ------- ------- ------- ------- 48 50 ------- 4 2 ------- ----- ------- ------- ------- ------- 51 45 ------- ------- ------- 1 ------- ------- ------- ------- 54 41 10 3 ------- ------- ------- ------- ------- ------- ------- ' 57 39 9 ------ ------- ----- ------- ------- ------- ------- ------- 60 35 7 ------- ------- 1 ------- ------- ------- ------- ------- 63 34 ------- 2 ------ - ------- ------- ------- ------- ------- 66 32 ------- ------- ------- ------- ------- ------- ------- ------- 69 27 ------- ------- ------- ------- ------- ------- ------- ------ ' 72 25 -- - ------- ------1 ------- ------- ------- ------- ------- ------- 75 24 78 21 6 81 ------- 5 ------- ------- ------- ------- ------- ------- ------- ------- 84 20 ------- 1 ------- ------- ------- ------- ------- ------- ------- 87 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 16 3 ------- ------- ------- ------- ------- ------- ------- ------- 99 12 2 ------- ------- ------- ------- ------- ------- ------- ------- 105 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- ' 108 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 9 ------- ------- ------- ------- ------- ------- ------- ------ 126 8 ------- ------- ------- ------- ------- ------- ------- ------- 132 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- ' 141 5 ------- ------- ------- ------- ------- ------- ------- 147 4 ------- ------- ------- ------- ------- ------- ------- ------ 186 3 ------- ------- ------- ------- ------- ------- ------- ------ 198 2 0 0 0 0 0 0 0 0 0 ' Table 5 Event-Stage-Duration Analysis IWDM fi tename: Future Land-use With Mitigation Bank d:\wetbank\wetbank.wdm ,Data set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 4.173 1.869 1.004 0.530 0.243 0.104 0.017 0.008 0.000 0.000 t >= Critical 2764 1238 665 351 161 69 11 5 0 0 Total Events 151 113 75 39 20 11 2 1 0 0 ' Duration(hr) Events 3 149 108 68 36 18 10 ------- 1 ------- ------- 6 138 90 49 26 13 4 ------ ------- ------- 9 122 58 29 18 6 2 1 ------- ------- ------- 12 96 35 19 11 5 ------- ------- ------- ------- ------- ' 15 70 25 12 6 3 ---- ------- ------- ------- ------- 18 51 20 7 4 ------- 1 ------- ------- ------- ------- 21 40 16 4 ------- ------- - -- ------- ------- ------- ------- 24 31 9 ------- 2 1 ------- ------- ------- ------- ------- 27 25 ' Table 6 Peak Stage Analysis - Wetland Mitigation Bank Site 2 Peak Stage (feet NGVD) at Return Period (yrs) ' Scenario 2 10 25 50 100 Current Land-use,No bank 11.38 13.80 15.04 15.96 16.89 ' Current Land-use, With bank 11.20 13.58 14.82 15.76 16.72 ' Change in Stage Quantile (%) -1.6% -1.6% -1.4% -1.3% -1.0% Future Land-use,No bank 13.80 15.74 16.46 16.92 17.33 ' Future Land-use,With bank 13.22 15.47 16.47 17.18 17.87 Change in Stage Quantile (%) -4.2% -1.8% 0.1% 1.6% 3.1% See Note Note: As described in the tent of this letter, the increase in peak stage quantiles for infrequent events (i.e. recurrence interval greater than 15 years)are an artifact of the Log Pearson Type III statistical ' analysis of peak annual stages, rather than an indication that peak stages are expected to increase with the proposed project. For the highest flood stage in the simulated record(January 1990)the simulated peak stage in the future land-use condition is reduced from 16.53 feet NGVD to 16.51 feet NGVD by the proposed mitigation bank. ' Appendix A HSPF User Control Input Files 1 Date: 03/22/95 File name: SBRK CUR.INP Page 1 Date: 03/22/95 File name: SBRK CUR.INP Page 2 RUN 5 5 0.1 4.7 .5 GLOBAL 6 6 0.1 .5 "• HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 7 7 0.1 4.2 .5 "• Input sequence (UCI) for current land-use conditions END HYDR-PARM2 .*+ Without Wetland Mitigation Bank Site 2 SPRINGBROOK CREEK - Current Conditions - HSPF Model for Long Runs HYDR-INIT START 1961/10/01 00:00 END 1991/09/30 24:00 RCHRES Initial conditions for HYDR •'• RUN INTERP OUTPUT LEVEL 0 # - # VOL Initial value of COLIND '" Initial value of OUTDGT RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 (ac-ft) for each possible exit - for each possible exit END GLOBAL EX1 EX2 EX3 EX4 EX5 "' EX1 EX2 EX3 EX4 EX5 OPN SEQUENCE 1 15 0.1 INGRP INDELT 1:00 END HYDR-INIT RCHRES 5 END RCHRES RCHRES 6 RCHRES 7 FTABLES END INGRP END OPN SEQUENCE FTABLE 6 FILES ROWS COLS +•• <FILE> <UN#>*'*<----FILE NAME-----------------------------------------------> 15 4 WDM 21 d:\wetbank\wetbank.wdm DEPTH AREA VOLUME OUTFLOW '+' MESSU 22 sbrk_cur.OUT (FT) (ACRES) (AC-FT) (CPS) "* INFO 23 c:\hspfl0\HSPINF.DA 0.00 0.00 0.00 0.00 ERROR 24 c:\hspfl0\HSPERR.DA 0.45 0.01 0.02 0.60 WARN 25 c:\hspfl0\HSPWRN.DA 0.90 0.01 0.08 3.60 END FILES 1.35 0.01 0.15 9.00 1.80 0.01 0.23 15.60 2.25 0.01 0.30 24.00 RCHRES 2.70 0.01 0.37 33.00 ACTIVITY 3.15 0.01 0.45 42.00 RCHRES Active Sections (1=Active; O=Inactive) +++ 3.60 0.01 0.52 51.60 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG '+* 4.05 0.01 0.58 57.00 1 162 1 4.50 0.01 0.60 60.00 END ACTIVITY 5.00 0.10 0.63 61.00 6.00 2.00 1.68 62.00 PRINT-INFO 10.00 4.00 13.66 66.00 Print-flags `*+ 12.00 20.00 37.68 70.00 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PH PIVL PYR "• END FTABLE 6 1 162 6 9 END PRINT-INFO FTABLE 7 GEN-INFO *+* STCORR 4.20 RCHRES<-------Name------->Nexit Unit Systems Printer *'* - HEC2 - Springbrook Creek at SW34th Street # - # User t-series Engl Metr LKFG +*+ ROWS COLS *'+ in out +++ 13 4 5 Sub-Basin S5 1 1 1 1 0 0 0 DEPTH AREA VOLUME OUTFLOWI **+ 6 Sub-Basin S6 1 1 1 1 0 0 0 (FT) (ACRES) (AC-FT) (CPS) '++ 7 Sub-Basin S7 1 1 1 1 0 0 0 0.0 0.00 0.00 0.0 END GEN-INFO 1.6 1.37 1.69 20.0 2.1 1.42 2.42 40.0 HYDR-PARM1 2.5 1.47 3.01 60.0 RCHRES Flags for HYDR section ++* 2.9 1.50 3.55 80.0 # - # VC Al A2 A3 ODFVFG for each ODGTFG for each '*' FUNCT for each 4.3 1.82 5.86 159.0 FG FG FG FG possible exit possible exit +•+ possible exit 6.7 2.38 10.88 318.0 1 2 3 1 2 3 4 5 1 2 3 4 5 *++ 8.6 2.84 15.76 477.0 10.4 3.26 21.16 636.0 5 0 1 0 0 4 11.4 4.75 24.75 795.0 6 0 0 0 0 4 13.3 72.22 88.48 1193.0 7 0 1 0 0 4 13.9 117.12 156.97 1590.0 END 11YDR-PARM1 13.9 117.74 166.84 1749.0 END FTABLE 7 HYDR-PARM2 RCHRES *" FTABLE 5 # - # DSN FTBN LEN DELTH STCOR KS "+ *'+ STCORR 4.70 r r r ar r� r r� r� rr s r �r r r rr r r r ■r Date: 03/22/95 File name: SBRK CUR.INP Page 3 Date: 03/22/95 File name: SBRK CUR.INP Page 4 HEC2 - Springbrook Creek at Oakesdale Ave MASS-LINK 1 ROWS COLS '++ <Srce> <-Grp> <-Member-><--Mult--> <Targ> <-Grp> <-Member-> ••. 13 4 <Name> <Name> <Name> # #<-factor-> <Name> <Name> <Name> # # +•• DEPTH AREA VOLUME OUTFLOWI '++ RCHRES ROFLOW RCHRES INFLOW (FT) (ACRES) (AC-FT) (CPS) +++ END MASS-LINK 1 0.0 0.00 0.00 0.0 1.8 0.94 1.10 18.0 END MASS-LINK 2.4 0.96 1.66 36.0 2.9 0.98 2.12 54.0 END RUN 3.3 1.01 2.53 72.0 4.7 1.28 4.19 145.0 7.2 1.77 7.91 290.0 9.4 2.35 12.30 434.0 11.6 2.95 18.04 579.0 12.9 11,48 22.90 724.0 14.1 35.57 59.22 1086.0 14.8 40.87 84.55 1448.0 15.0 42.06 93.33 1593.0 5ND FTABL5 5 ENO FTASLES EXT SOURCES <-Volume-> LMember> y3ysS94 p<•_Mult-->Ttan <-T&Oet V01s7 <-Grp> L-Member-7 ++• <Nsme> # LName> # (em 3trg<.fact1r->5Crg <Name7 # # LName> EXTERNAL REACHES .. .,' SPRING0'OK CREE1 TO REACO 5 AND F50 S-4 WDo 204 FLOW ENGL 0.082645 RCHR6y 5 EXTNL JVOL ..' MILL CREEK TO REACH 5 AND FEQ M-19 I,1D(A 219 fLOW 6NGL 0.082645 RCHR6y 5 EXTNL JVOL .., UPPER SfRINGBR0O) WETLAND OVERFLOW To REACH 6 WpO 212 fLOW 6NGL 0.082645 RCHR6y 6 EXTNL JVOL ..' BASINS SNOEASIN +.' SS Wpo 144 fERO 6NGL 2.6637 RCHR6y 5 EXTNL fVOL Woo 145 y°RQ 6NGL 1.5657 RCHR6y 5 EXTNL JVOL SIJOBASIN ..r S6 W00 190 0RO 6NGL 1.25p0 RCHR6y 6 EXTNL JVOL 144 f"O 6NGL NGL 16.6710 RCHR6y 6 EXTNL JVOL Woo 145 y 6 1873 RCAR5 6 EXTNL JVOL SOOBAsIN ..' S7a WOO 144 fERO URO 6NGL NGL 3.2795 RCHR6y 7 EXTNL J�OL Wv0 145 7 6 2895 RCHR6y 7 EXTNL J L E0 EXT SOURCES TARG E1:olume e>S�-Grp> <-011"ber_><�"Mult_�>?fan <_VoyJme_> <MBi"ber> Ts�s Tgap A.nd . + <14�RgS # YDR <NAme> # #<1factor_>a(r9 <Nam89 2 # <Ne89 we> t®L stt9 5cppp9++. RGORES 5 OYDR RO RO WDM 206 PLOW ENGL AGGR A D M F G GGR p RG0RExT 7 �ETs STP RO GE WON 290 STPG ENGL R p9D Etl TAR S GOEMATIC bo fea jet, S•-> > <IIIRES # <_fP RG�RES S RCHaS� i Re 6 �C CNR6 E11 SCH EMAT MASS LIMk Date: 03/22/95 File name: SBRK_FUT.INP _ Page 1 Date: 03/22/95 File name: SBRK FUT.INP Page 2 RUN 6 6 0.1 .5 GLOBAL 7 7 0.1 4.2 .5 '•` HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 END HYDR-PARM2 ••* Input sequence (UCI) for future land-use conditions •*• Without Mitigation Bank Site 2 HYDR-INIT SPRINGBROOK CREEK - Future Conditions - HSPF Model for Long Runs RCHRES Initial conditions for HYDR ••• START 1961/10/01 00:00 END 1991/09/30 24:00 # - # VOL Initial value of COLIND ••• Initial value of OUTDGT RUN INTERP OUTPUT LEVEL 0 (ac-ft) for each possible exit *** for each possible exit RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 EX1 EX2 EX3 EX4 EX5 •** EX1 EX2 EX3 EX4 EX5 END GLOBAL 1 15 0.1 OPN SEQUENCE END HYDR-INIT INGRP INDELT 1:00 END RCHRES RCHRES 5 RCHRES 6 FTABLES RCHRES 7 END INGRP END OPN SEQUENCE FTABLE 6 ROWS COLS •*' FILES 15 4 <FILE> <UN#>*'*<----FILE NAME-------------------------------------------------> DEPTH AREA VOLUME OUTFLOW *•* WDM 21 d:\wetbank\wetbank.wdm (FT) (ACRES) (AC-FT) (CPS) **' MESSU 22 sbrk_FUT.OUT 0.00 0.00 0.00 0.00 INFO 23 c:\hspfl0\HSPINF.DA 0.45 0.01 0.02 0.60 ERROR 24 c:\h5pfl0\HSPERR.DA 0.90 0.01 0.08 3.60 WARN 25 c:\hspfl0\HSPWRN.DA 1.35 0.01 0.15 9.00 END FILES 1..80 0.01 0.23 15.60 2.25 0.01 0.30 24.00 RCHRES 2.70 0.01 0.37 33.00 ACTIVITY 3.15 0.01 0.45 42.00 RCHRES Active Sections (1=Active; O=Inactive) *•+ 3.60 0.01 0.52 51.60 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG +*+ 4.05 0.01 0.58 57.00 1 162 1 4.50 0.01 0.60 60.00 END ACTIVITY 5.00 0.10 0.63 61.00 6.00 2.00 1.68 62.00 PRINT-INFO 10.00 4.00 13.68 66.00 Print-flags `*' 12.00 20.00 37.68 70.00 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PH PIVL PYR '•` END FTABLE 6 1 162 6 9 FTABLE 7 END PRINT-INFO *** STCORR 4.20 **+ HEC2 - Springbrook Creek at SW34th Street GEN-INFO ROWS COLS *** RCHRES<-------Name------->Nexit Unit Systems Printer *'* 13 4 # - # User t-series Engl Metr LKFG •** DEPTH AREA VOLUME OUTFLOWI *** in out ++* (FT) (ACRES) (AC-FT) (CFS) *++ 5 Sub-Basin S5 1 1 1 1 0 0 0 0.0 0.00 0.00 0.0 6 Sub-Basin S6 1 1 1 1 0 0 0 1.6 1.37 1.71 21.0 7 Sub-Basin S7 1 1 1 1 0 0 0 2.1 1.42 2.45 41.0 END GEN-INFO 2.5 1.47 3.03 62.0 2.8 1.50 3.55 82.0 HYDR-PARM1 4.2 1.82 5.83 164.0 RCHRES Flags for HYDR section *•• 6.7 2.37 10.80 328.0 # - # VC Al A2 A3 ODFVFG for each ODGTFG for each *•• FUNCT for each 8.6 2.84 15.76 493.0 FG FG FG FG possible exit possible exit *** possible exit 10.4 3.27 21.26 657.0 1 2 3 1 2 3 4 5 1 2 3 4 5 *•* 11.4 5.38 24.98 821.0 13.1 68.64 79.11 1232.0 5 0 1 0 0 4 13.9 117.17 158.50 1642.0 6 0 0 0 0 4 13.9 117.75 168.00 1806.0 7 0 1 0 0 4 END FTABLE 7 END HYDR-PARM1 FTABLE 5 HYDR-PARM2 *** STCORR 4.70 RCHRES *** *** HEC2 - Springbrook Creek at Oakesdale Ave # - # DSN FTBN LEN DELTH STCOR KS *** ROWS COLS *** 5 5 0.1 4.7 .5 13 4 Date: 03/22/95 File name: SBRK FUT.INP Page 3 Date: 03/22/95 File name: SBRK FUT.INP - Page 4 DEPTH AREA VOLUME OUTFLOWI ... END MASS-LINK 1 (FT) (ACRES) (AC-FT) (CFS) •+' 0.0 0.00 0.00 0.0 END MASS-LINK 1.9 0.94 1.15 20.0 2.5 0.97 1.70 39.0 END RUN 2.9 0.99 2.17 59.0 3.3 1.02 2.59 78.0 4.7 1.28 4.28 156.0 7.2 1.78 8.04 312.0 9.5 2.39 12.64 469.0 11.9 3.00 18.76 625.0 13.0 16.01 24.55 781.0 14.2 36.31 61.78 1172.0 14.9 41.84 90.16 1562.0 15.1 54.33 100.30 1718.0 END FTABLE 5 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ••. <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # EXTERNAL REACHES ••- "' SPRINGBROOK CREEK TO REACH 5 WDM 304 FLOW ENGL 0.082645 RCHRES 5 EXTNL IVOL ••' MILL CREEK TO REACH 5 WDM 319 FLOW ENGL 0.082645 RCHRES 5 EXTNL IVOL ••* BASINS SUBBASIN - S5 WDM 144 PERO ENGL 1.7400 RCHRES 5 EXTNL IVOL WDM 145 SURO ENGL 2.4933 RCHRES 5 EXTNL IVOL SUBBASIN ••+ S6 WDM 140 PERO ENGL 0.0750 RCHRES 6 EXTNL IVOL WDM 141 PERO ENGL 1.3038 RCHRES 6 EXTNL IVOL WDM 144 PERO ENGL 4.4385 RCHRES 6 EXTNL IVOL WDM 145 SURO ENGL 20.1578 RCHRES 6 EXTNL IVOL SUBBASIN ••• S7a WDM 144 PERO ENGL 2.2754 RCHRES 7 EXTNL IVOL WDM 145 SURO ENGL 5.4329 RCHRES 7 EXTNL IVOL END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ++• <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg•'• RCHRES 5 HYDR RO WDM 389 FLOW ENGL AGGR ADD RCHRES 6 HYDR RO WDM 306 FLOW ENGL AGGR ADD RCHRES 7 HYDR RO WDM 390 FLOW ENGL AGGR ADD RCHRES 7 HYDR STAGE WDM 391 STAG ENGL AGGR ADD END EXT TARGETS SCHEMATIC <-Source-> <--Area--> <-Target-> <ML-> •'+ <Name> # <-factor-> <Name> # # '++ RCHRES 5 RCHRES 7 1 RCHRES 6 RCHRES 7 1 END SCHEMATIC MASS-LINK MASS-LINK 1 <Srce> <-Grp> <-Member-><--Mult--> <Targ> <-Grp> <-Member-> '++ <Name> <Name> <Name> # #<-factor-> <Name> <Name> <Name> # # '•' RCHRES ROFLOW RCHRES INFLOW �r r it r r ar r� rr r� r� r� ■r rr rr r rr rr r� r� Date: 03/22/95 File name: BANK_CUR.INP Page 1 Date: 03/22/95 File name: BANK CUR.INP Page 2 RUN (ac-ft) for each possible exit +++ for each possible exit GLOBAL EX1 EX2 EX3 EX4 EX5 +++ EX1 EX2 EX3 EX4 EX5 `•' HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 1 15 0.1 "+ Input sequence (UCI) for current land-use conditions END HYDR-INIT With Wetland Mitigation Bank Site 2 END RCHRES SPRINGBROOK CREEK - Current Conditions - HSPF Model for Long Runs START 1961/10/01 00:00 END 1991/09/30 24:00 FTABLES RUN INTERP OUTPUT LEVEL 0 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 END GLOBAL FTABLE 7 OPN SEQUENCE ." STCORR 4.20 INGRP INDELT 1:00 ++• HEC2 - Springbrook Creek at SW34th Street with Bank Volume RCHRES 7 ROWS COLS +++ END INGRP 13 4 END OPN SEQUENCE DEPTH AREA VOLUME OUTFLOWI •.. (FT) (ACRES) (AC-FT) (CPS) - FILES 0.0 0.00 0.00 0.0 <FILE> <UN#>+`+<----FILE NAME----------------------------------------------> 1.6 1.37 1.69 20.0 WDM 21 d:\wetbank\wetbank.wdm 2.1 1.42 2.82 40.0 MESSU 22 bank_cur.OUT 2.5 1.47 3.91 60.0 INFO 23 c:\hspfl0\HSPINF.DA 2.9 1.50 5.05 80.0 ERROR 24 c:\h5pfl0\HSPERR.DA 4.3 1.82 11.56 159.0 WARN 25 c:\hspfl0\HSPWRN.DA 6.7 2.38 31.68 318.0 END FILES 8.6 2.84 56.76 477.0 10.4 3.26 83.56 636.0 11.4 4.75 100.15 795.0 RCHRES 13.3 72.22 190.08 1193.0 ACTIVITY 13.9 117.12 265.47 1590.0 RCHRES Active Sections (1=Active; O=Inactive) +++ 13.9 117.74 275.34 1749.0 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG `++ END FTABLE 7 1 162 1 END ACTIVITY END FTABLES PRINT-INFO Print-flags ++' EXT SOURCES # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PINK PH PIVL PYR +'+ <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> '•' 1 162 6 9 <Name> # <Name> # tam strg<-factor->strg <Name> # # <Name> # # '•' END PRINT-INFO EXTERNAL REACHES ••+ "• SPRINGBROOK CREEK TO REACH 7 GEN-INFO WDM 289 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL RCHRES<-------Name------->Nexit Unit Systems Printer +++ +++ REACH 6 # - # User t-series Engl Metr LKFG '++ WDM 206 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL in out +++ +++ BASINS 7 Sub-Basin S7 1 1 1 1 0 0 0 SUBBASIN - S7a END GEN-INFO WDM 144 PERO ENGL 3.2795 RCHRES 7 EXTNL IVOL WDM 145 SURD ENGL 1.2B95 RCHRES 7 EXTNL IVOL HYDR-PARMI END EXT SOURCES RCHRES Flags for HYDR section +'+ # - # VC Al A2 A3 ODFVFG for each ODGTFG for each +++ FUNCT for each FG FG FG FG possible exit possible exit .+' possible exit EXT TARGETS 1 2 3 1 2 3 4 5 1 2 3 4 5 "` <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd `•` <Name> # <Name> # #<-factor->strg <Name> # <Name> tam strg strg'•• 7 0 1 0 0 4 RCHRES 7 HYDR RO WDM 590 FLOW ENGL AGGR ADD END HYDR-PARM1 RCHRES 7 HYDR STAGE WDM 591 STAG ENGL AGGR ADD END EXT TARGETS HYDR-PARM2 ... RCHRES ... END RUN # - # DSN FTBN LEN DELTH STCOR KS +** 7 7 0.1 4.2 .5 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for HYDR +++ # - # VOL Initial value of COLIND `++ Initial value of OUTDGT r r r r r� r� �r r� r r ri ■r �r r� r �r r +r r Date: 03/22/95 File name: BANK FUT.INP Page 1 Date: 03/22/95 File name: BANK FUT.INP Page 2 RUN EX1 EX2 EX3 EX4 EX5 ••• EX1 EX2 EX3 EX4 EX5 GLOBAL 1 15 0.1 "+ HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 END HYDR-SNIT +•• Input sequence (UCI) for future land-use conditions END RCHRES .. With With Mitigation Bank Site 2 SPRINGBROOK CREEK - Future Conditions - HSPF Model for Long Runs FTABLES START 1961/10/01 00:00 END 1991/09/30 24:00 RUN INTERP OUTPUT LEVEL 0 FTABLE 7 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 +" STCORR 4.20 END GLOBAL '++ HEC2 - Springbrook Creek at SW34th Street OPN SEQUENCE ROWS COLS '" INGRP INDELT 1:00 13 4 RCHRES 7 DEPTH AREA VOLUME OUTFLOWI ••' END INGRP (FT) (ACRES) (AC-FT) (CFS) END OPN SEQUENCE 0.0 0.00 0.00 0.0 1.6 1.37 1.71 21.0 FILES 2.1 1.42 2.85 41.0 <FILE> <UN#>•••<----FILE NAME-------------------------------------------------> 2.5 1.47 3.93 62.0 WDM 21 d:\wetbank\wetbank.wdm 2.8 1.50 4.85 82.0 MESSU 22 bank_FUT.OUT 4.2 1.82 11.13 164.0 INFO 23 c:\hspfl0\HSPINF.DA 6.7 2.37 31.60 328.0 ERROR 24 c:\hspfl0\HSPERR.DA 8.6 2.84 56.76 493.0 WARN 25 c:\hspfl0\HSPWRN.DA 10.4 3.27 83.66 657.0 END FILES 11.4 5.38 100.38 821.0 13.1 68.64 177.91 1232.0 RCHRES 13.9 117.17 267.00 1642.0 ACTIVITY 13.9 117.75 276.50 1806.0 RCHRES Active Sections (1=Active; 0=Inactive) "+ END FTABLE 7 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG •'• END FTABLES 1 162 1 END ACTIVITY EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ••• PRINT-INFO <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # '•• Print-flags +'• +++ SPRINGBROOK CREEK TO REACH 7 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PINK PH PIVL PYR •'+ WDM 389 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL 1 162 6 9 ++• SubBasin S6 TO REACH 7 END PRINT-INFO WDM 306 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL •" BASINS GEN-INFO SUBBASIN ••• S7a RCHRES<-------Name------->Nexit Unit Systems Printer ++' WDM 144 PERO ENGL 2.2754 RCHRES 7 EXTNL IVOL # - # User t-series Engl Metr LKFG +++ WDM 145 SURO ENGL 5.4329 RCHRES 7 EXTNL IVOL in out +++ END EXT SOURCES 7 Sub-Basin S7 1 1 1 1 0 0 0 END GEN-INFO EXT TARGETS HYDR-PARM1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ••• RCHRES Flags for HYDR section +•+ <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg••• # - # VC Al A2 A3 ODFVFG for each ODGTFG for each '+• FUNCT for each RCHRES 7 HYDR RO WDM 690 FLOW ENGL AGGR REPL FG FG FG FG possible exit possible exit ••' possible exit RCHRES 7 HYDR STAGE WDM 691 STAG ENGL AGGR REPL 1 2 3 1 2 3 4 5 1 2 3 4 5 '•• END EXT TARGETS 7 0 1 0 0 4 END HYDR-PARM1 END RUN HYDR-PARM2 RCHRES ••• # - # DSN FTBN LEN DELTH STCOR KS •`+ 7 7 0.1 4.2 .5 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for HYDR `++ # - # VOL Initial value of COLIND •+• Initial value of OUTDGT (ac-ft) for each possible exit ++' for each possible exit Date: 03/22/95 File name: DUR ANN.INP Page 1 Date: 03/22/95 File name: DUR ANN.INP Page 2 RUN WDM 391 STAG ENGL 1.00 DURANL 3 INPUT TIMSER GLOBAL WDM 691 STAG ENGL 1.00 DURANL 4 INPUT TIMSER +++ ESG Wetland Existing Conditions Stage Duration NHC INC. 3/31/95 END EXT SOURCES ESG Wetland Existing Conditions Stage Duration NHC INC. 3/31/95 START 1961/10/01 00:00 END 1991/09/30 24:00 END RUN RUN INTERP OUTPUT LEVEL 0 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 END GLOBAL OPN SEQUENCE INGRP INDELT 1:00 DURANL 1 DURANL 2 DURANL 3 DURANL 4 END INGRP END OPN SEQUENCE FILES <FILE> <UN#>+++<----FILE NAME----------------------------------—---------> WDM 21 d:\wetbank\wetbank.wdm MESSU 22 dur_ann.OUT 52 dur_ann.drl 53 dur_ann.dr2 54 dur_ann.dr3 55 dur_ann.dr4 INFO 23 c:\hspfl0\HSPINF.DA ERROR 24 c:\hspfl0\HSPERR.DA WARN 25 c:\hspfl0\HSPWRN.DA END FILES DURANL GEN-DURDATA 123456789012345678901234567890123456789012345678901234567890 +++ #thru#< title > ndur nlev prfg punt '++ 1 Stage in Wetland C No bank(Annual) 1 20 1 52 2 Stage in Wetland C W/bank (Annual) 1 20 1 53 3 Stage in Wetland F No bank(Annual) 1 20 1 54 4 Stage in Wetland F w/bank (Annual) 1 20 1 55 END GEN-DURDATA SEASON +++ Start End #thru#+++ mo da hr mn mo da hr mn 5 11 2 6 3 10 1 4 10 01 00 9 30 24 END SEASON DURATIONS #thru#+++< --- durations ---> 1 4 1 END DURATIONS LEVELS #thru#+'+ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 #thru#+++ 15 16 17 18 19 20 1 4 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 1 4 11.5 12.0 13.0 14.0 15.0 16.0 END LEVELS END DURANL EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ++' <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # +++ WDM 291 STAG ENGL 1.00 DURANL 1 INPUT TIMSER WDM 591 STAG ENGL 1.00 DURANL 2 INPUT TIMSER northwest hydraulic consultants inc. edmonton 22017 70th avenues. va n co U ve f kent,washington 98032 (206)872-0218 seatt I e March 31, 1995 Scott Woodbury City of Renton Department of Public Works ` 200 Mill Ave S, 4th Floor Renton WA 98055 Subject: Mitigation Bank Site 2 Reconnaissance Level Hydrologic Analysis Dear Scott : We have completed our reconnaissance level review of the hydrologic benefits of the proposed Mitigation Bank Site 2 located between Oakesdale Avenue and SW 34th Street . As specified in our contract we have conducted flood frequency analyses of flows upstream of SW 34th Street and stage inundation analyses of simulated water levels near the location of the proposed bank for both current and future land-use scenarios. In addition, we have developed stage frequency and stage duration analyses of water levels in Springbrook Creek at the site of the proposed mitigation bank. The results of these analyses are shown in Figures 1 through 12 and Tables 1 through 6, and are discussed in greater detail below. Methodology: The HSPF User control input files (UCIs) developed by Northwest Hydraulic Consultants (NHC) for the present East Side Green River Watershed Project (ESGRWP) hydrologic analyses (City of Renton Contract CAG-90-033) provided the basis for this modeling effort. These were adapted as necessary to investigate the following four scenarios: Current land-use without the proposed mitigation bank Future land-use without the proposed mitigation bank Current land-use with the proposed mitigation bank Future land-use with the proposed mitigation bank The first two scenario's, without the mitigation bank, correspond to the current and future hydrologic analyses being conducted for the ESGRWP. The HSPF models for those analyses were used directly without modification. Flows in Mill and Springbrook Creeks at their conflu- ence were extracted from hydrologic analyses currently being performed by NHC for the City of Kent. Current land-use/conveyance conditions overflows from Upper Springbrook Creek upstream of SR 167 into Springbrook Creek sub-basin S6 (SW 43rd Street basin) were also extracted from the City of Kent analyses and used as input to the HSPF simulations. RIVER ENGINEERING i HYDRAULIC MODEL TESTING 11 HYDRAULIC ANALYSIS AND DESIGN COASTAL ENGINEERING HYDROLOGY / SEDIMENTATION ENGINEERING / NUMERICAL MODELING APPLIED RESEARCH / FORENSIC ENGINEERING The final two scenario's, with the proposed mitigation bank, required modification of the Stage/Storage/Discharge relationship (FTABLE) for Springbrook Creek at SW 34th Street. The FTABLE was modified by adding the additional storage available in the mitigation bank to the previously computed storage in the channel (using NHC's most recent HEC-2 model) at the corresponding stage. Note that this manner of incorporating the mitigation bank storage is physically equivalent to having unconstrained inflows and outflows from the mitigation bank(i.e. no hydraulic losses). In actuality, the connections to and from the mitigation bank site would cause at least some head loss and the results would be affected accordingly. The final HSPF UCI files are provided in text form in Appendix A and digital form on the attached diskette. The HEC-2 input files for Springbrook Creek are also included on the diskette. Using these files, hydrologic simulations were run for each scenario for the period October 1961 through September 1991. Flows at the SW 34th Street culvert and stages upstream of SW 34th Street were computed and stored in a watershed data management(WDM) file. Annual peak stages and peak water surface elevations were extracted from the WDM file and analyzed to determine the 2-, 10-, 25-, and 100-year flow and stage quantiles. The stage data were also processed using an NHC developed stage duration program (ELDUR) to compute event-depth- duration information for each scenario for annual and seasonal periods. Peak Flow Analysis: Simulated annual peak flows at the SW 34th Street site were extracted from the WDM file and analyzed using the Corps of Engineers HEC-FFA flood frequency program. Plots of the simulated flow data and computed Log Pearson Type III probability distribution are shown in Figures 1 through 4. Peak flow quantiles for the four scenarios are summarized in Table 1. Note that the HEC-FFA software does not allow plotting more than one data set per sheet. Therefore, comparative frequency plots were generated using NHC's own PLOT_CDF program. Simulated peak annual flows and fitted Log Pearson Type III distributions for current land-use with and without the mitigation bank are shown in Figure 5. A similar plot for the future land-use scenarios is provided in Figure 6. Digital copies of the HEC-FFA input, output and generated plot files are provided on the attached diskette. As shown in Figures 5 and 6 and Table 1, simulated peak flows are not significantly altered by the proposed mitigation bank. For current land-use conditions the mitigation bank would lower peak flow quantiles by 3 % to 4 % for return periods between 2- and 100-years. For future land-use conditions the change in theoretical peak flow quantiles ranges between a reduction of approxi- mately 10 % for the 2-year flow to an increase of approximately 6 % for the 100-year flow. Note that the increase in flood flow quantiles at higher recurrence intervals is an artifact of the theoretical frequency distribution and the relatively short simulated record. Review of the simulations for individual events show that the peak flow for each maximum annual event in the thirty year record is reduced at least slightly. However, peak flow reductions are most significant for moderate events, particularly those with recurrence intervals of approximately 2 years. Therefore, the theoretical frequency fit for the "with bank" condition is bowed slightly upward at the high end and extrapolations beyond the simulated data produce higher quantiles than those computed for the "without bank" scenario. Figure 7 shows the simulated reduction in flow for each peak annual event in the simulation period. The event rankings from 1 to 30 correspond to recurrence intervals between about 1.03- and 55-years. Stage Event-Depth-Duration Analysis: The simulated time series of stages upstream of SW 34th Street were processed using an NHC stage analysis program, ELDUR. ELDUR reads the data in the WDM file and computes the total number of hours that the stage exceeded user defined limits. The program further computes the number of events of specified duration(in hours) for which the stage limits are exceeded. The output from ELDUR is a matrix of event-depth-duration data which facilitates comparison of the hydrologic performance of the wetland with and without the proposed bank. ELDUR analyses were run for the four scenarios for annual and seasonal periods. The three seasons investigated were from October 1 through December 31, March 1 through May 31, and July 1 through September 30. The results of these analyses are shown in Tables 2 through 5 (note that Tables 2 through 5 have multiple pages). Generally the water levels upstream of SW 34th Street would not rise as high nor remain high as long with the proposed bank. Specific comparisons can be made by comparing the results in Table 2 with those in Table 3 for the current land-use condition, and the results in Table 4 with the results in Table 5 for the future land-use condition. It is beyond NHC's area of expertise to interpret the wetland impacts of the hydrologic changes shown in Tables 2 through 5. Digital copies of the ELDUR input and output files are provided on the attached diskette along with a copy of the latest version of the ELDUR program. Peak Stage Analysis: In addition to the analyses described above, analysis of peak stages was conducted. Simulated annual peak stages at the SW 34th Street site were extracted from the WDM file and analyzed using NHC's PLOT_CDF flood frequency program. Plots of the simulated stage data and fitted Log Pearson Type III probability distribution are shown in Figures 8 and 9. Peak stage quantiles for the four scenarios are summarized in Table 6. As shown in Figures 8 and 9, simulated peak annual stages are reduced slightly by the proposed mitigation bank. For current land-use conditions the mitigation bank would lower peak stage quantiles by approximately 1 % for return periods between 2- and 100-years. The stage quantiles for the future land-use scenarios, shown in Table 6, show a similar increase at higher recurrence intervals to that shown in the flow analysis. As discussed above this is an artifact of the theoreti- cal distribution rather than an indication that peak stages will be increased with the proposed bank. Figure 10 shows the simulated change in peak annual stage for each event in the simulated record. In general, the proposed bank will cause somewhat lower peak stages (up to 0.9 feet) for events of about a 2-year recurrence but it will have very little impact on peak stages associated with the most severe events (i.e. the simulated stage for the January 9 1990 event for future land-use conditions is reduced by only 0.02 feet). This indicates that the additional volume provided by the mitigation bank is adequate for moderate events but is insignificant compared to the simulated storm runoff volume during severe events. Stage Duration Analysis: The final analysis conducted was duration analysis of simulated stages upstream of SW 34th Street. Using HSPF the simulated stage data was processed to compute the percentage of the simulation period that specified stages were exceeded. The results of this analysis were plotted as shown in Figures 11 and 12. Basically the mitigation bank will have an imperceptible effect on stage durations except at the highest stages (those attained less than 0.1 % of the time). Note that these stages are exceeded on average less than 10 hours per year. For the highest stages the duration at a given stage may be reduced by up to 15% with the proposed bank. For example, the future conditions without bank simulations show that a stage of 15 feet will be attained for approximately 69 hours over the 30 years. With the proposed mitigation bank this would be reduced to about 58 hours in the 30 years. Conclusions: The results of these analyses indicate that the proposed mitigation bank will have a relatively minor hydrologic impact on streamflows and stages at SW 34th Street. Although the bank may provide some reduction in peak flow quantiles for moderate events, it is unlikely to have any discernible impact during severe storms. This is because the additional storage volume in the proposed bank is relatively small compared to the expected runoff volume during a significant event. The impact on stages will also be most pronounced during moderate events with very little reduction in peak stages during the most severe events. The stage duration analysis shows that the duration at the highest stages may be reduced slightly, although the reductions are of the order of several hours per year or less. Finally, note that although Tables 2 through 5 provide some indication of the expected wetland water levels in the proposed bank, the simplifying hydraulic assumptions, both in the use of the HSPF/HEC-2 models and the assumed connection to the stream channel need to be considered carefully when using this data. Sincerely NORTHWEST HYDRAULIC CONSULTANTS Larry M. 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.._..................._._........._...______.._._,._..._._._,._..._.___....____.__..._......___...._......_......._.................__. _. i ti s 70.00 ®Change in Peak Flows for Current Land-use Scenarios O Change in Peak for60.00 Future Land-u;Flows narios c 50.00 0 a � a 4 40.00 0 w a 30.00 20.00 — ---- - —{ s 10.00 - - - } t 0.00 -n 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Event Rank (30 is most severe event in record) C CD 19 18 + Without Mitigation Bank , With Mitigation Bank 17 16 15 n z 14 .'� --- + + �. 13 + M 12 4-1 a + 10 9 8 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) Z East Side Green River - Wetland Mitigation Bank 2 Analyses Current Land-use Simulated Peak Stages in Mill Creek at SW 34th Street cn co 19 18 + Without Mitigation Bank , With Mitigation Bank 17 16 o ' z 14 + 13 --- + + **** m + � 12 + + .*4 � cc 10 9 8 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) East Side Green River - Wetland Mitigation Bank 2 Analyses Future Land-use Simulated Peak Stages in Mill Creek at SW 34th Street CD co East Side Green River - Wetland Mitigation Bank 2 Analyses Simulated Reduction In Peak Stage with Proposed Bank 0.90 __._................................._........... F 0.80 ■Change in Peak Stage for Current Land-use Scenarios O Change in Peak Stage for Future Land-use 0.70 Scenarios c 0.60 a a� 0.50 or, 0.40 — --- -- -- a� 0.30 f x 0.20 = { i 0.10 - — - - f 1 -n 0.00 - - (o 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 C Event Rank (30 is most severe event in record) CD 0 Average Hours Per Year Exceeded .088 0.876 8.76 87.6 876 8760 17.0 16.0 — — Current LU without Mitigation Bank I Current LU with Mitigation Bank 15.0 1 -- 14.0 13.0 12.0 w 0 11.0 ` Z 10.0 w 9.0 3 8.0 7.0 6.0 5.0 4.0 10' 104 10-3 10-2 10 1 100 -n Exceedence Probability(p) CE c I ESGRW Mitigation Bank Site 2 - Wetland Stage Ihtration Analysis cD Springbrook Creek at SW 34th Street Ai ntd Comparison Average Hours Per Year Exceeded .088 0.876 8.76 87.6 876 8760 17.0 16.0 — Future LU without Ntigation Bank Future LU with Mitigation Bank 15.0 14.0 13.0 12.0 w p� 11.0 Z 10.0 b� C� 9.0 3 8.0 7.0 6.0 5.0 4.0 10' 104 10-3 10 2 10 1 100 -n Exceedence Probability(p) c ESGRW Nfitigation Bank Site 2 - Wetland Stage Duration Analysis Springbrook Creek at SW 34th Street NAnnual Comparison Table 1 Peak Flow Analysis - Wetland Mitigation Bank Site 2 Peak Flow (cfs) at Return Period (yrs) Scenario 2 10 25 50 100 Current Land-use,No bank 355 570 698 803 917 Current Land-use,With bank 342 547 672 776 890 Change in Flow Quantile (%) -3.8% -4.0% -3.7% -3.4% -3.0% Future Land-use,No bank 585 824 930 1005 1076 Future Land-use, With bank 530 787 926 1033 1144 Change in Flow Quantile (%) -9.3% -4.5% -0.5% 2.8% 6.3% See Note Note: As described in the text of this letter, the increase in peak flow quantiles for infrequent events (i.e. recurrence interval greater than 25 years)are an artifact of the Log Pearson Type III statistical analysis of peak annual flows, rather than an indication that peak flows are expected to increase with the proposed project. For the largest flood flow in the simulated record(January 1990)the simulated peak discharge in the future land-use condition is reduced from 973 cfs to 954 cfs by the proposed mitigation bank. Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 Xt >= Critical 17.768 7.129 3.300 1.289 0.453 0.174 0.084 0.030 0.007 0.000 t >= Critical 46724 18748 8678 3389 1191 458 220 78 19 0 Total Events 1261 1106 575 232 86 35 17 10 4 0 Duration(hr) Events 3 1255 1049 527 200 76 31 16 8 3 ------- 6 1181 866 419 166 65 21 14 5 1 ------- 9 1071 645 321 127 50 18 10 4 ------- ------- 12 944 480 245 98 35 15 9 3 ------- ------- 15 797 381 181 74 27 12 ------- ------- ------- ------- 18 691 322 151 61 22 ------- 6 1 ------- ------- 21 594 263 118 50 18 9 ------- ------- ------- ------- 24 527 223 96 44 15 7 ------- ------- ------- ------- 27 475 189 82 37 12 5 ------- ------- ------- ------- 30 435 159 70 32 10 ------- ------- ------- ------- ------- 33 402 140 64 27 9 ------- ------- ------- ------- ------- 36 368 126 55 25 7 ------- ------- ------- ------- ------- 39 335 100 50 20 6 ------- 1 ------- ------- ------- 42 307 91 49 18 ------- ------- ------- ------- ------- ------- 45 291 83 39 13 3 ------- ------- ------- ------- ------- 48 278 70 32 12 ------- 2 ------- ------- ------- ------- 51 256 68 30 10 ------- ------- ------- ------- ------- ------- 54 245 63 ------- 8 ------- ------- ------- ------- ------- ------- 57 235 56 26 ------- 2 ------- ------- ------- ------- ------- 60 220 52 22 ------- ------- ------- ------- ------- ------- ------- 63 205 44 14 5 ------- ------- ------- ------- ------- ------- 66 191 40 12 ------- 1 ------- ------- ------- ------- ------- 69 186 38 10 3 ------- ------- ------- ------- ------- ------- 72 172 37 8 2 ------- ------- ------- ------- ------- ------- 75 166 29 6 ------- ------- ------- ------- ------- ------- ------- 78 160 27 ------- 1 ------- ------- ------- ------- ------- ------- 81 144 26 ------- ------- ------- ------- ------- ------- ------- ------- 84 139 22 4 ------- ------- ------- ------- ------- ------- ------- 87 130 17 3 ------- ------- ------- ------- ------- ------- ------- 90 126 15 2 ------- ------- ------- ------- ------- ------- ------- 93 121 14 ------- ------- ------- ------- ------- ------- ------- ------- 96 118 ------- ------- ------- ------- ------- ------- ------- ------- 99 112 13 ------- ------- ------- ------- ------- ------- ------- ------- 102 102 12 ------- ------- ------- ------- ------- ------- ------- ------- 105 101 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 94 11 ------- ------- ------- ------- ------- ------- ------- ------- ill91 9 ------- ------- ------- ------- ------- ------- ------- ------- 114 83 ------- ------- ------- ------- ------- ------- ------ ------- 117 79 ------- ------- ------- ------- ------- ------- ------- ------- 120 74 ------- ------- ------- ------- ------- ------- ------- ------- 123 72 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 68 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 65 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 62 5 ------- ------- ------- ------- ------- ------- ------- ------- 135 61 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 59 4 ------- ------- ------ ------- ------- ------- ------- ------- 144 56 ------- ------- ------- ------- ------- ------- ------ ------- ------- 147 54 ------- ------- ------- ------- ------- ------- ------ ------- ------- 150 51 ------- ------- ------- ------- ------- ------- ------ ------- ------- 153 50 3 ------- ------- ------- ------- ------- ------- ------- ------- 156 47 ------- ------- ------- ------- ------- ------- ------ 159 42 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 41 2 ------- ------- ------- ------- ------- ------- ------- ------- 165 39 ------- ------- ------- ------- ------- ------- 168 37 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 33 ------- ------- ------- ------- ------- ------ ------- ------- ------- 177 31 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 29 ------- ------- ------- ------- ------- ------- ------- 192 28 ------- ------- ------- ------- ------ ------- ------- ------- ------- 195 26 ------- ------- ------- ------- ------- ------ ------- ------- ------- 198 25 0 0 0 0 0 0 0 0 0 Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 27.867 11.866 5.818 2.409 0.790 0.270 0.107 0.032 0.008 0.000 t >= Critical 18459 7860 3854 1596 523 179 71 21 5 0 Total Events 527 478 260 121 45 16 7 3 1 0 Duration(hr) Events 3 524 454 237 100 38 14 7 3 1 ------- 6 489 375 184 83 31 9 6 2 ------- ------- 9 451 272 143 62 23 8 ------- ------- ------- ------- 12 399 199 113 46 14 7 3 1 ------- ------- 15 342 157 84 35 11 5 ------- ------- ------- ------- 18 294 136 66 26 9 ------- 1 ------- ------- ------- 21 252 110 48 22 8 4 ------- ------- ------- ------- 24 213 92 38 20 6 2 ------- ------- ------- ------- 27 184 80 32 16 5 1 ------- ------- ------- ------- 30 173 66 ------- 14 4 ------- ------- ------- ------- ------- 33 162 60 28 12 3 ------- ------- ------- ------- ------- 36 149 51 23 11 ------- ------- ------- ------- ------- ------- 39 135 39 ------- 9 2 ------- ------- ------- ------- ------- 42 121 33 22 8 ------- ------- ------- ------- ------- ------- 45 115 31 19 5 1 ------- ------- ------- ------- ------- 48 112 ------- 15 4 ------- ------- ------- ------- ------- ------- 51 105 25 14 ------- ------- ------- ------- ------- ------- ------- 54 102 23 ------- 3 ------- ------- ------- ------- ------- ------- 57 95 ------- 11 ------- ------- ------- ------- ------- ------- ------- 60 87 21 8 ------- ------- ------- ------- ------- ------- ------- 63 79 17 5 2 ------- ------- ------- ------- ------- ------- 66 73 ------- 4 ------- ------- ------- ------- ------- ------- ------- 69 70 16 ------- ------- ------- ------- ------- ------- ------- ------- 72 64 15 ------- ------- ------- ------- ------- ------- ------- ------- 75 62 12 3 ------- ------- ------- ------- ------- ------- ------- 78 60 11 ------- ------- ------- ------- ------- ------- ------- ------- 81 56 10 ------- ------- ------- ------- ------- ------- ------- ------- 84 54 9 ------- ------- ------- ------- ------- ------- ------- ------- 87 49 7 ------- ------- ------- ------- ------- ------- ------- ------- 90 47 ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 43 5 ------- ------- ------- ------- ------- ------- ------- ------- 96 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 37 ------- ------- ------- ------- ------- ------ ------- ------- ------- 105 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 32 ------- ------- ------- ------- ------- ------ ------- ------- ------- ill31 4 ------- ------- ------- ------- ------- ------- ------- ------- 114 28 ------- ------- ------- ------- ------- ------ ------- ------- ------- 117 25 ------- ------- ------- ------- ------- ------ ------- ------- ------- 120 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 21 ------- ------- ------- ------- ------- ------ ------- ------- ------- 129 20 ------- ------- ------- ------- ------- ------ ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------ ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------ ------- ------- ------- 138 17 ------- ------- -------- ------- ------- ------ ------- ------- ------- 144 16 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 14 ------- ------- ------- ------- ------- ------ ------- ------- ------- 153 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 168 13 ------- ------- ------- ------- ------ ------- ------- ------- ------- 177 10 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 7 0 0 0 0 0 0 0 0 0 Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank w'DM filename: d:\wetbank\wetbank.wdm ^ata Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 t >= Critical 13.780 4.612 1.715 0.525 0.208 0.128 0.089 0.038 0.008 0.000 t >= Critical 9128 3055 1136 348 138 85 59 25 5 0 Total Events 294 202 90 24 6 3 2 2 1 0 Duration(hr) Events 3 294 187 81 21 6 ------- ------- 2 1 ------- 6 274 153 59 16 ------- 3 ------- ------- ------- ------- 9 245 114 42 13 4 ------- ------- ------- ------- ------- 12 209 78 32 8 ------- ------- ------- ------- ------- ------- 15 175 62 20 6 3 ------- ------- ------- ------- ------ 18 152 51 19 5 ------- -—---- 2 1 ------- ------- 21 127 40 14 ------- ------- ------- ------- ------- ------- ------- 24 109 32 9 ------- ------- ------- ------- ------- ------- 27 101 27 ------- ------- ------- 2 ------- ------- ------- ------- 30 93 23 ------- ------- ------- ------- ------- ------- ------- ------- 33 83 20 ------- ------- ------- ------- ------- ------- ------- ------- 36 76 18 6 ------ --- ------- ----- ------- ------- ------- 39 69 ------- ------- ------- 2 ------- 1 ----- -- -- --- -- 42 64 12 ------- 3 ------- ------- ------- ------- ------- ------- 45 61 ------- ------- ------- ------ ------- ------- ------- ------- 48 54 ------- ------- ------- ------- 1 ------- ------- ------- ------- 51 47 11 5 ------- ------- ------- ------- ------- ------- ------- 54 42 10 ------- 2 ------- ------- ------- ------- ------- ------- 57 41 9 4 ------- ------- ------- ------- ------- ------- ------- 60 38 8 3 ------- ------- ------- ------- ------- ------- ------- 63 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 66 ------- 7 ------- ------- 1 ------- ------- ------- ------- ------- 69 32 ------- 2 ------- ------- ------- ------- ------- ------- 72 29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 28 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 26 ------- ------- 1 ------- ------- ------- ------- ------- ------- 81 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 84 22 5 ------- ------- ------- ------- ------- ------- ------- ------- 90 21 ------- 1 ------- ------- ------- ------- ------- ------- ------- 93 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 16 3 ------- ------- ------- ------- ------- ------- ------- ------- 105 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 14 2 ------- ------- ------- ------- ------- ------- ------- ------- ill13 1 ------- ------- ------- ------- ------- ------- ------- ------- 117 12 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 3 0 0 0 0 0 0 0 0 0 Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank .JDM filename: d:\uetbank\uetbank.udm Data Set number: 291 ..Elevation GREATER than or equal Critical Dotal Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 :ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 >t >= Critical 3.137 1.135 0.471 0.155 0.027 0.002 0.000 0.000 0.000 0.000 t >= Critical 2078 752 312 103 18 1 0 0 0 0 Total Events 118 75 36 13 2 1 0 0 0 0 Duration(hr) Events 3 116 71 31 10 ------- ------- ------- ------- ------- ------- 6 108 51 24 8 ------- ------- ------- ------- ------- ------- 9 90 33 13 5 ------- ------- ------- ------- ------- ------- 12 78 20 9 4 ------- ------- ------- ------- ------- ------- 15 52 15 6 ------- 1 ------- ------- ------- ------- ------- 18 40 12 4 ------- ------- ------- ------- ------- ------- ------- 21 28 8 ------- 1 ------- ------- ------- ------- ------- ------- 24 24 ------- 2 ------- ---- -- ------- ------- ------- ------- ------- 27 21 4 1 ------- ------- ------- ------- ------- ------- ------- 30 15 2 ------- ------- ------- ------- ------- ------- ------- ------- 33 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 36 9 1 ------- ------- ------- ------- ------- ------- ------- ------- 39 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 63 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 0 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 tit >= Critical 17.765 7.202 3.290 1.263 0.449 0.171 0.084 0.028 0.006 0.000 t >= Critical 46716 18938 8651 3320 1180 450 220 73 15 0 Total Events 1261 1101 550 201 75 27 15 7 3 0 Duration(hr) Events 3 1250 1049 510 190 72 24 15 7 3 ------- 6 1184 877 412 158 61 21 14 6 1 ------- 9 1069 655 320 128 49 18 10 4 ------- ------- 12 940 492 247 100 35 17 9 3 ------- ------- 15 798 386 185 75 30 14 ------- ------- ------- ------- 18 691 324 152 61 22 10 6 ------- ------- ------- 21 593 266 122 49 18 9 2 1 ------- ------- 24 526 230 100 45 15 7 ------- ------- ------- ------- 27 474 189 84 38 12 5 ------- ------- ------- ------- 30 434 161 72 34 11 4 ------- ------- ------- ------- 33 399 141 64 28 9 ------- ------- ------- ------- ------- 36 363 128 55 25 7 ------- ------- ------- ------- ------- 39 332 103 52 20 6 ------- 1 ------- ------- ------- 42 306 94 49 17 ------- ------- ------- ------- ------- ------- 45 290 84 41 13 3 ------- ------- ------- ------- ------- 48 276 71 36 12 ------- 2 ------- ------- ------- ------- 51 257 68 33 10 ------- 1 ------- ------- ------- ------- 54 245 64 28 9 ------- ------- ------- ------- ------- ------- 57 234 58 27 ------- 2 ------- ------- ------- ------- ------- 60 218 51 23 ------- ------- ------- ------- ------- ------- ------- 63 201 44 14 5 ------- ------- ------- ------- ------- ------- 66 187 41 13 ------- 1 ------- ------- ------- ------- ------- 69 183 38 9 4 ------- ------- ------- ------- ------- ------- 72 171 37 8 3 ------- ------- ------- ------- ------- ------- 75 165 29 7 ------- ------- ------- ------- ------- ------- ------- 78 159 27 ------- ------- ------- ------- ------- ------- ------- ------- 81 145 26 ------- 1 ------- ------- ------- ------- ------- ------- 84 138 21 4 ------- ------- ------- ------- ------- ------- ------- 87 128 18 3 ------- ------- ------- ------- ------- ------- ------- 90 125 15 2 ------- ------- ------- ------- ------- ------- ------- 93 122 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 117 14 ------- ------- ------- ------- ------- ------- ------- ------- 99 ill 13 ------- ------- ------- ------- ------- ------- ------- ------- 102 104 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 102 12 ------- ------- ------- ------- ------- ------- ------- ------- 108 93 10 ------- ------- ------- ------- ------- ------- ------- ------- ill90 9 ------- ------- ------- ------- ------- ------- ------- ------- 114 85 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 80 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 75 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 72 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 68 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 67 5 ------- ------- ------- ------- ------- ------- ------- ------- 132 63 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 62 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 60 4 ------- -------- ------- ------- ------- ------- ------- ------- 141 57 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 56 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 55 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 52 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 50 3 ------- ------- ------- ------- ------- ------- ------- ------- 156 48 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 43 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 42 2 ------- ------- ------- ------- ------- ------- ------- ------- 165 40 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 39 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 32 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 30 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 28 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 26 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 27.874 12.024 5.797 2.355 0.767 0.258 0.112 0.027 0.006 0.000 t >= Critical 18464 7965 3840 1560 508 171 74 18 4 0 Total Events 531 476 249 103 36 13 7 2 1 0 Duration(hr) Events 3 524 456 229 94 35 10 7 ------- 1 ------- 6 490 378 182 79 29 9 6 2 ------- ------- 9 454 278 146 63 22 8 ------- ------- ------- ------- 12 397 207 115 49 15 7 3 1 ------- ------- 15 341 157 85 36 13 6 ------- ------- ------- ------- 18 294 138 69 27 9 ------- ------- ------- ------- ------- 21 252 113 50 22 8 4 1 ------- ------- ------- 24 213 97 39 20 6 2 ------- ------- ------- ------- 27 187 81 33 17 ------- ------- ------- ------- ------- ------- 30 171 68 29 16 5 1 ------- ------- ------- ------- 33 160 61 28 12 3 ------- ------- ------- ------- ------- 36 148 52 23 11 ------- ------- ------- ------- ------- ------- 39 135 42 22 9 2 ------- ------- ------- ------- ------- 42 122 36 21 7 ------- ------- ------- ------- ------- ------- 45 116 32 20 5 1 ------- ------- ------- ------- ------- 48 113 26 17 4 ------- ------- ------- ------- ------- ------- 51 107 25 15 ------- ------- ------- ------- ------- ------- ------- 54 102 24 ------- 3 ------- ------- ------- ------- ------- ------- 57 97 ------- 11 ------- ------- ------- ------- ------- ------- ------- 60 91 21 8 ------- ------- ------- ------- ------- ------- ------- 63 79 ------- 5 2 ------- ------- ------- ------- ------- ------- 66 71 17 4 ------- ------- ------- ------- ------- ------- ------- 69 69 16 ------- ------- ------- ------- ------- ------- ------- ------- 72 63 15 ------- 1 ------- ------- ------- ------- ------- ------- 75 61 12 3 ------- ------- ------- ------- ------- ------- ------- 78 59 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 56 11 ------- ------- ------- ------- ------- ------- ------- ------- 84 54 8 ------- ------- ------- ------- ------- ------- ------- ------- 87 49 7 ------- ------- ------- ------- ------- ------- ------- ------- 90 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 44 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 42 5 ------- ------- ------- ------- ------- ------- ------- ------- 99 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 36 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- ill29 4 ------- ------- ------- ------- ------- ------- ------- ------- 114 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 20 ------- ------- ------- ------- ------- ------ ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------ ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------- 138 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 16 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 15 ------- ------- ------- ------- ------ ------- ------- ------- ------- 150 14 ------- ------- ------- ------- ------- ------ ------- ------- ------- 153 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 156 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 10 1 ------- ------- ------- ------- ------- ------- ------- ------- 180 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 7 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 :ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 Xt >= Critical 13.767 4.633 1.698 0.525 0.205 0.131 0.089 0.042 0.006 0.000 t >= Critical 9119 3069 1125 348 136 87 59 28 4 0 Total Events 294 198 84 22 6 3 2 2 1 0 Duration(hr) Events 3 292 185 80 20 5 1 -- -- 6 274 153 57 16 4 3 ------- 2 ------- ------- 9 242 114 40 13 ------- ------- ------- ------- ------- ------- 12 208 79 31 8 ------- ------- ------- ------- ------- ------- 15 179 64 21 6 3 ------ ------- -----"" ------- 18 154 50 18 5 ------- ------- 2 ------- ------- ------- 21 127 41 15 ------- ------- ------- ------- 1 ------- ------- 24 109 33 11 ------- ------- ------- ------- ------- ------- ------- 27 99 27 7 ------- ------- ------- ------- ------- ------- 30 92 23 ------- ------- ------- 2 ------- ------- ------- ------- 33 83 20 ------- ------- ------- ------- ------- ------- ------- ------- 36 74 18 ------- ------ - --- ------ ------- ------- ------- 39 70 ------- 6 ------- 2 ------- 1 ------- ------- ------- 42 64 12 ------- 3 ------- ------- ------- ------- ------- ------- 45 61 ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 53 ------- - - ------- ----- ------ ------- ------- ------- 51 48 11 5 ------- ------- 1 ------- ------- ------- ------- 54 44 ------- ------- 2 ------- ------- ------- ------- ------- ------- 57 41 10 4 ------- ------- ------- ------- ------- ------- ------- 60 35 8 3 ------- ------- ------- ------- ------- ------- ------- 63 34 ------- ------- ------- ------- ------- ------- ------- ------- ------- 66 ------- 7 2 ------- 1 ------- ------- ------- ------- ------- 69 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 28 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 26 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 ------- ------- ------- 1 ------- ------- ------- ------- ------- ------- 84 23 5 ------- ------- ------- ------- ------- ------- ------- ------- 87 ------- 4 ------- ------- ------- ------- ------- ------- ------- ------- 90 21 ------- 1 ------- ------- ------- ------- ------- ------- ------- 93 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 16 3 ------- ------- ------- ------- ------- ------- ------- ------- 108 14 2 ------- ------- ------- ------- ------- ------- ------- ------- 111 13 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 12 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 3 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank WDM filename: d:\uetbank\uetbank.udm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 3.148 1.156 0.476 0.146 0.026 0.000 0.000 0.000 0.000 0.000 t >= Critical 2085 766 315 97 17 0 0 0 0 0 Total Events 116 73 36 11 1 0 0 0 0 0 Duration(hr) Events 3 116 69 28 10 ------- ------- ------- ------- ------- ------- 6 108 57 24 8 ------- ------- ------- ------- ------- ------- 9 91 36 13 5 ------- ------- ------- ------- ------- ------- 12 77 21 10 2 ------- ------- ------- ------- ------- ------- 15 53 16 6 ------- 1 ------- ------- ------- ------- ------- 18 39 12 4 ------- ------- ------- ------- ------- ------- ------- 21 28 7 ------- ------- ------- ------- ------- ------- ------- ------- 24 25 4 3 1 ------- ------- ------- ------- ------- ------- 27 21 3 1 ------- ------- ------- ------- ------- ------- ------- 30 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 33 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 36 9 2 ------- ------- ------- ------- ------- ------- ------- ------- 39 8 ------- ------- ------- ------- ------- ------ ------- ------- ------- 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 45 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 7 ------- ------- ------- ------- ------- ------ ------- ------- ------- 51 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 54 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 57 ------- ------- ------- ------- ------ ------- ------- ------- ------- ------- 60 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 63 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 66 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 ------- ------- ------- ------- ------ ------- ------- ------- ------- ------- 78 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- 84 ------- ------- ------- ------- ------ ------- ------- ------- ------- ------- 87 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 90 ------- ------- ------- ------- ------ ------- ------- ------- ------- ------- 93 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 ------- ------- ------- ------- ------ ------- ------- ------- ------- ------- 99 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 111 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 114 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 ------- ------- ------- ------ ------ ------- ------- ------- ------- ------- 138 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 162 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 180 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 0 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank WDM filename: d:\uetbank\uetbank.udm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 18.997 8.649 4.814 2.732 1.306 0.581 0.253 0.123 0.043 0.005 t >= Critical 49956 22744 12658 7184 3435 1528 666 323 112 14 Total Events 1491 1486 1086 693 352 173 92 48 19 2 Duration(hr) Events 3 1482 1405 969 608 298 146 66 32 15 ------- 6 1400 1177 711 437 205 91 41 17 6 2 9 1271 865 495 282 139 62 26 14 5 ------- 12 1093 616 348 198 99 42 15 10 4 ------- 15 922 464 253 137 68 27 13 8 1 ------- 18 781 365 192 96 50 22 10 3 ------- ------- 21 681 303 155 76 35 17 7 ------- ------- ------- 24 599 246 123 59 26 12 4 ------- ------- ------- 27 536 204 96 49 23 9 ------- ------- ------- ------- 30 483 181 79 44 19 5 ------- ------- ------- ------- 33 434 153 65 36 16 ------- ------- ------- ------- ------- 36 399 128 54 26 12 4 ------- ------- ------- ------- 39 362 103 48 25 6 ------- ------- 1 ------- ------- 42 334 93 41 22 5 ------- 1 ------- ------- ------- 45 308 81 32 16 4 ------- ------- ------- ------- ------- 48 282 72 27 11 ------- 2 ------- ------- ------- ------- 51 264 67 ------- 9 3 ------- ------- ------- ------- ------- 54 251 62 23 7 ------- ------- ------- ------- ------- ------- 57 236 54 21 ------- 2 ------- ------- ------- ------- ------- 60 221 46 16 5 ------- ------- ------- ------- ------- ------- 63 207 43 13 ------- ------- ------- ------- ------- ------- ------- 66 194 41 8 4 ------- ------- ------- ------- ------- ------- 69 184 39 6 2 ------- ------- ------- ------- ------- ------- 72 175 37 5 1 ------- ------- ------- ------- ------- ------- 75 166 30 ------- ------- ------- ------- ------- ------- ------- ------- 78 153 27 4 ------- ------- ------- ------- ------- ------- ------- 81 147 22 ------- ------- ------- ------- ------- ------- ------- ------- 84 139 18 3 ------- ------- ------- ------- ------- ------- ------- 87 134 14 ------- ------- ------- ------- ------- ------- ------- ------- 90 123 11 ------- ------- ------- ------- ------- ------- ------- ------- 93 116 10 ------- ------- ------- ------- ------- ------- ------- ------- 96 ill 9 ------- ------- ------- ------- ------- ------- ------- ------- 99 98 8 ------- ------- ------- ------- ------- ------- ------- ------- 102 93 7 ------- ------- ------- ------- ------- ------- ------- ------- 105 90 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 86 6 ------- ------- ------- ------- ------- ------- ------- ------- ill77 5 ------- ------- ------- ------- ------- ------- ------- ------- 114 73 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 69 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 67 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 65 4 ------- ------- ------- ------- ------- ------- ------- ------- 129 61 3 ------- ------- ------- ------- ------- ------- ------- ------- 132 60 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 58 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 53 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 51 ------- ------- -------- ------- ------- ------- ------- ------- ------- 147 47 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 43 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 41 ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 37 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 26 2 ------- ------- ------- ------- ------- ------- ------- ------- 180 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 19 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank ,MM filename: d:\wetbank\wetbank.wdm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 :ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 Gt >= Critical 30.821 14.899 8.690 5.270 2.662 1.205 0.492 0.225 0.074 0.011 t >= Critical 20416 9869 5756 3491 1763 798 326 149 49 7 Total Events 600 631 471 317 180 95 52 26 9 1 Duration(hr) Events 3 598 596 426 286 150 80 37 19 7 ------- 6 569 508 318 212 107 53 19 ------- 3 1 9 527 385 225 138 76 32 10 7 2 ------- 12 454 271 157 104 50 21 7 5 1 ------- 15 391 199 126 72 32 13 6 3 ------- ------- 18 338 161 90 49 24 11 4 1 ------- ------- 21 291 131 72 37 18 7 3 ------- ------- ------- 24 257 107 55 26 14 5 2 ------- ------- ------- 27 222 93 42 24 13 4 ------- ------- ------- ------- 30 201 85 34 22 10 ------- ------- ------- ------- ------- 33 178 69 29 19 9 ------- ------- ------- ------- ------- 36 174 57 26 ------- 8 2 ------- ------- ------- ------- 39 158 46 24 15 ------- ------- ------- ------- ------- ------- 42 149 40 20 12 3 ------- ------- ------- ------- ------- 45 137 35 16 7 2 ------- ------- ------- ------- ------- 48 125 30 14 ------- ------- ------- ------- ------- ------- ------- 51 114 28 ------- 5 1 ------- ------- ------- ------- ------- 54 106 25 ------- 4 ------- ------- ------- ------- ------- ------- 57 101 22 10 ------- ------- ------- ------- ------- ------- ------- 60 94 ------- 9 2 ------- ------- ------- ------- ------- ------- 63 86 20 6 ------- ------- ------- ------- ------- ------- ------- 66 79 19 4 1 ------- ------- ------- ------- ------- ------- 69 75 18 2 ------- ------- ------- ------- ------- ------- ------- 72 71 17 ------- ------- ------- ------- ------- ------- ------- ------- 75 69 14 ------- ------- ------- ------- ------- ------- ------- ------- 78 66 12 ------- ------- ------- ------- ------- ------- ------- ------- 81 62 9 ------- ------- ------- ------- ------- ------- ------- ------- 84 55 8 ------- ------- ------- ------- ------- ------- ------- ------- 87 54 6 ------- ------- ------- ------- ------- ------- ------- ------- 90 50 3 ------- ------- ------- ------- ------- ------- ------- ------- 93 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 43 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 32 2 ------- ------- ------- ------- ------- ------- ------- ------- ill28 ------- ------- ------- ------- ------- ------- ------- ------- ------- 114 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 14 ------- ------- ------- . ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 165 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 12 ------- ------- ------- ------ ------- ------- ------- ------- ------- 171 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 9 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 5 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank dDM filename: d:\wetbank\wetbank.wdm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 ;ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 :t >= Critical 14.444 5.670 2.791 1.327 0.480 0.214 0.131 0.092 0.035 0.000 t >= Critical 9568 3756 1849 879 318 142 87 61 23 0 Total Events 358 289 186 109 33 14 5 3 3 0 Duration(hr) Events 3 355 273 170 91 27 12 5 ------- 2 ------- 6 328 212 121 53 18 5 4 ------- ------- ------- 9 289 147 68 31 11 ------- ------- ------- ------- ------- 12 247 106 47 20 9 4 ------- ------- ------- ------- 15 202 73 30 12 6 ------- ------- ------- 1 ------- 18 165 52 24 7 3 ------- ------- 2 ------- ------- 21 143 44 20 5 ------- ------- ------- ------- ------- ------- 24 121 35 13 4 ------- ------- 2 ------- ------- ------- 27 109 28 9 ------- ------- ------- ------- ------- ------- ------- 30 96 25 7 ------- ------- 2 ------- ------- ------- ------- 33 83 21 5 ------- ------- ------- ------- ------- ------- ------- 36 74 16 ------- ------- ------- ------- ------- ------- ------- ------- 39 67 ------- ------- ------- 2 ------- ------- 1 ------- ------- 42 63 11 ------- ------- ------- ------- 1 ------- ------- ------- 45 55 ------- 4 3 ------- ------- ------- ------- ------- ------- 48 48 ------- ------- 2 ------- 1 ------- ------- ------- ------- 51 45 ------- ------- ------- ------- ------- ------- ------- ------- ------- 54 43 10 3 ------- ------- ------- ------- ------- ------- ------- 57 39 8 ------- ------- 1 ------- ------- ------- ------- ------- 60 35 7 ------- ------- ------- ------- ------- ------- ------- ------- 63 34 ------- 2 ------- ------- ------- ------- ------- ------- ------- 66 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 26 ------- ------- 1 ------- ------- ------- ------- ------- ------- 75 24 6 ------- ------- ------- ------- ------- ------- ------- ------- 78 21 5 ------- ------- ------- ------- ------- ------- ------- ------- 81 ------- 4 ------- ------- ------- ------- ------- ------- ------- ------- 84 20 ------- 1 ------- ------- ------- ------- ------- ------- ------- 87 19 ------- ------- ------- ------- ------- ------ ------- ------- ------- 93 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 96 16 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 12 1 ------- ------- ------- ------- ------- ------- ------- ------- 105 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 7 ------- ------- ------- ------- ------- ------ ------- ------- ------- 135 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 3 ------- ------- ------- ------- ------- ------ ------- ------- ------- 198 2 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 :ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 rt >= Critical 4.185 1.801 0.974 0.548 0.261 0.116 0.024 0.009 0.000 0.000 t >= Critical 2772 1193 645 363 173 77 16 6 0 0 Total Events 152 112 81 50 26 15 6 2 0 0 Duration(hr) Events 3 147 104 68 41 19 11 ------- 1 ------- ------- 6 134 85 45 27 12 ------- ------- ------- ------- ------- 9 122 54 27 16 6 3 1 ------- ------- ------- 12 95 33 18 8 5 ------- ------- ------- ------- ------- 15 72 24 9 5 3 ------- ------- ------- ------- ------- 18 50 20 6 3 ------- 1 ------- ------- ------- ------- 21 40 16 4 ------- 1 ------ ------ ------- ------- ------- 24 31 9 ------- 1 ------- ------- ------- ------- ------- ------- 27 26 5 3 ------- ------- ------- ------- ------- ------- ------- 30 23 4 2 ------- ------- ------- ------- ------- ------- ------- 33 20 ------- ------- ------- ------- ------- ------- ------- ------ 36 14 ------- ------- ------- ------- ------- ------- ------- ------ 39 11 2 ------- ------- ------- ------- ------- ------- ------- ------- 45 8 ------- ------- ------- ------- ------- ------- ------- ------ 54 7 ------- ------- ------- ------- ------- ------- ------- ------ 75 5 ------- ------- ------- ------- ------- ------- ------- ------ 84 4 ------- ------- ------- ------- ------- ------- ------- ------ 87 2 ------- ------- ------- ------- ------- ------- ------- ------ 198 0 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 18.979 8.845 4.875 2.698 1.269 0.564 0.243 0.110 0.034 0.005 t >= Critical 49908 23260 12821 7095 3338 1482 638 289 90 12 Total Events 1485 1483 1033 600 291 138 65 31 13 2 Duration(hr) Events 3 1480 1423 949 568 271 121 58 24 12 6 1412 1211 723 432 205 93 43 16 ------- 2 9 1273 899 507 293 140 63 28 13 5 ------- 12 1094 640 358 204 99 46 18 11 3 ------- 15 917 474 263 145 68 29 15 8 1 ------- 18 777 375 198 105 51 24 13 5 ------- ------- 21 678 309 163 81 38 18 8 2 ------- ------- 24 599 252 133 62 31 17 4 ------- ------- ------- 27 533 208 102 53 26 11 ------- ------- ------- ------- 30 482 187 85 46 21 7 ------- ------- ------- ------- 33 437 155 69 40 18 5 ------- ------- ------- ------- 36 399 131 56 ------- 16 4 ------- ------- ------- 39 364 108 48 28 8 ------- ------- 1 ------- ------- 42 341 95 41 23 5 ------- 1 ------- ------- ------- 45 308 84 32 17 ------- ------- ------- ------- ------- 48 286 73 28 11 4 2 ------- ------- ------- ------- 51 265 66 ------- 9 3 1 ------- ------- ------- ------- 54 249 62 23 7 ------- ------- ------- ------- ------- ------- 57 236 55 21 ------- 2 ------- ------- ------- ------- ------- 60 222 46 16 5 1 ------- ------- ------- ------- ------- 63 209 43 15 ------- ------- ------- ------- ------- ------- ------- 66 196 40 10 4 ------- ------- ------- ------- ------- ------- 69 182 39 6 3 ------- ------- ------- ------- ------- ------- 72 174 36 5 2 ------- ------- ------- ------- ------- ------- 75 163 30 ------- 1 ------- ------- ------- ------- ------- ------- 78 153 28 4 ------- ------- ------- ------- ------- ------- ------- 81 147 23 ------- ------- ------- ------- ------- ------- ------- ------- 84 141 20 3 ------- ------- ------- ------- ------- ------- ------- 87 131 15 ------- ------- ------- ------- ------- ------- ------- ------- 90 125 13 ------- ------- ------- ------- ------- ------- ------- ------- 93 116 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 107 11 ------- ------- ------- ------- ------- ------- ------- ------- 99 101 10 ------- ------- ------- ------- ------- ------- ------- ------- 102 93 8 ------- ------- ------- ------- ------- ------- ------- ------- 105 91 7 ------- ------- ------- ------- ------- ------- ------- ------- 108 88 6 ------- ------- ------- ------- ------- ------- ------- ------- ill79 5 ------- ------- ------- ------- ------- ------- ------- ------- 114 76 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 70 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 68 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 67 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 65 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 62 4 ------- ------- ------- ------- ------- ------- ------- ------- 132 60 3 ------- ------- ------- ------- ------- ------- ------- ------- 135 57 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 54 ------- ------- ------ ------- ------- ------- ------- ------- ------- 141 53 ------- ------- ------ ------ ------- ------- ------- ------- ------- 144 51 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 45 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 37 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 36 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 180 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 186 22 ------- ------- ------- ------- ------- ------- ------- ------- ------ 189 21 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 17 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank WOM filename: d:\uetbank\uetbank.udm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 30.803 15.219 8.827 5.232 2.600 1.164 0.473 0.192 0.059 0.009 t >= Critical 20404 10081 5847 3466 1722 771 313 127 39 6 Total Events 599 629 447 284 151 76 36 17 6 1 Duration(hr) Events 3 598 603 421 269 140 66 32 11 6 ------- 6 570 520 324 204 108 52 22 7 ------- 1 9 525 398 232 141 76 33 12 ------- 2 ------- 12 453 284 163 107 53 24 9 6 1 ------- 15 391 203 128 73 32 14 7 4 ------- ------- 18 336 165 94 54 24 12 6 2 ------- ------- 21 292 134 75 41 18 9 3 1 ------- ------- 24 258 112 59 28 15 8 2 ------- ------- ------- 27 222 96 43 25 13 5 ------- ------- ------- ------- 30 201 88 36 23 12 4 ------- ------- ------- ------- 33 182 71 30 22 10 3 ------- ------- ------- ------- 36 173 58 27 ------- 9 2 ------- ------- ------- ------- 39 159 48 24 16 5 ------- ------- ------- ------- ------- 42 151 40 20 12 3 ------- ------- ------- ------- ------- 45 138 36 16 8 ------- ------- ------- ------- ------- ------- 48 127 31 14 ------- 2 ------- ------- ------- ------- ------- 51 114 28 ------- 5 1 ------- ------- ------- ------- ------- 54 106 25 ------- 4 ------- ------- ------- ------- ------- ------- 57 100 23 10 ------- ------- ------- ------- ------- ------- ------- 60 93 ------- 9 2 ------- ------- ------- ------- ------- ------- 63 85 20 8 ------- ------- ------- ------- ------- ------- ------- 66 78 19 4 ------- ------- ------- ------- ------- ------- ------- 69 74 18 2 ------- ------- ------- ------- ------- ------- ------- 72 69 16 ------- ------- ------- ------- ------- ------- ------- ------- 75 66 14 ------- 1 ------- ------- ------- ------- ------- ------- 78 63 12 ------- ------- ------- ------- ------- ------- ------- ------- 81 61 ------- ------- ------- ------- ------ ------- ------- ------- ------- 84 56 9 ------- ------- ------- ------- ------- ------- ------- ------- 87 53 6 ------- ------- ------- ------- ------- ------- ------- ------- 90 50 4 ------- ------- ------- ------- ------- ------- ------- ------- 93 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 40 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 39 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 33 ------- ------- ------- ------- ------ ------- ------- ------- ------- 108 32 2 ------- ------- ------- ------- ------- ------- ------- ------- ill29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 114 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 25 ------- ------- ------- ------- ------ ------- ------- ------- ------- 120 24 ------- ------- ------- ------- ------ ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 17 ------- ------- -------• ------- ------- ------- ------- ------- ------- 150 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 168 13 ------- ------- ------- ------ ------- ------- ------- ------- ------- 171 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 180 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 4 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank 4DM filename: d:\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 ;ritical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 .t >= Critical 14.417 5.821 2.820 1.292 0.459 0.207 0.130 0.091 0.030 0.000 t >= Critical 9550 3856 1868 856 304 137 86 60 20 0 Total Events 354 283 181 89 23 11 5 2 2 0 Duration(hr) Events 3 349 273 167 83 22 9 5 --- - 2 -""" 6 329 222 122 56 18 6 4 ------- ------- ------- 9 291 155 70 32 11 ------- ------- ------- ---"--- ------- 12 246 108 46 22 7 4 ------- ------ --"---- 15 200 73 32 15 5 ------- ------ 1 ------ 18 167 52 24 10 ------- ------- ------- 2 ------- ------- 21 139 43 21 6 ------- ------- ------- ------- ------- 24 121 34 14 ------- ------- ------- 2 ------- ------- ------- 27 106 27 10 4 ------- ------- ------- ------- ------- 30 95 25 7 ------- ------- 2 ------- ------- ------- ------- 33 84 21 5 ------ ------- ------- ------- ------- ------- 36 74 17 ------- ------- 3 ------- ------ ------- ------- 39 67 - ------- ------- 2 ------- ------ 1 - - -- -- 42 64 12 ------- ------- ------- ------ 1 -- - - -- ---- 45 54 11 ------- 3 ------- ------- ------- ------- ------- ------- 48 50 ------- 4 2 ------- ------- ------- ------- ------- 51 45 ------- ------- ------- ------- 1 ------- ------- ------- ------- 54 41 10 3 ------- ------- ------- ------- ------- ------- ------- 57 39 9 ------- ------- ------- ------- ------- ------- ------- ------- 60 35 7 ------- ------- 1 ------- ------- ------- ------- ------- 63 34 ------- 2 ------- ------- ------- ------- ------- ------- ------- 66 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 25 ------- ------- 1 ------- ------- ------- ------- ------- ------- 75 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 21 6 ------- ------- ------- ------- ------- ------- ------- 81 ------- 5 ------- ------- ------- ------- ------- ------- ------- ------- 84 20 ------- 1 ------- ------- ------- ------- ------- ------- ------- 87 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 16 3 ------- ------- ------- ------- ------- ------- ------- ------- 99 12 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 11 ------- ------- ------- ------- ------- ------- ------- ------- 123 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 8 ------- ------- ------- ------- ------- ------- ------- ------- 132 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 2 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank NDM filename: d:\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 4.173 1.869 1.004 0.530 0.243 0.104 0.017 0.008 0.000 0.000 t >= Critical 2764 1238 665 351 161 69 11 5 0 0 Total Events 151 113 75 39 20 11 2 1 0 0 Duration(hr) Events 3 149 108 68 36 18 10 ------- 1 ------- ------- 6 138 90 49 26 13 4 ------- ------- ------- ------- 9 122 58 29 18 6 2 1 ------- ------- ------- 12 96 35 19 11 5 ------- ------- ------- ------- ------- 15 70 25 12 6 3 ------- ------- ------- ------- ------- 18 51 20 7 4 ------- 1 ------- ------- ------- ------- 21 40 16 4 ------- ------- ------- ------- ------- ------- ------- 24 31 9 ------- 2 1 ------- ------- ------- ------- ------- 27 25 Table 6 Peak Stage Analysis - Wetland Mitigation Bank Site 2 Peak Stage (feet NGVD) at Return Period (yrs) Scenario 2 10 25 50 100 Current Land-use,No bank 11.38 13.80 15.04 15.96 16.89 Current Land-use, With bank 11.20 13.58 14.82 15.76 16.72 Change in Stage Quantile (%) -1.6% -1.6% -1.4% -1.3% -1.0% Future Land-use,No bank 13.80 15.74 16.46 16.92 17.33 Future Land-use, With bank 13.22 15.47 16.47 17.18 17.87 Change in Stage Quantile (%) -4.2% -1.8% 0.1% 1.6% 3.1% See Note Note: As described in the tent of this letter, the increase in peak stage quantiles for infrequent events (i.e. recurrence interval greater than 15 years)are an artifact of the Log Pearson Type III statistical analysis of peak annual stages, rather than an indication that peak stages are expected to increase with the proposed project. For the highest flood stage in the simulated record(January 1990)the simulated peak stage in the future land-use condition is reduced from 16.53 feet NGVD to 16.51 feet NGVD by the proposed mitigation bank. Appendix A HSPF User Control Input Files Date: 03/22/95 File name: SBRK CUR.INP Page 1 Date: 03/22/95 File name: SBRK CUR.INP Page 2 RUN 5 5 0.1 4.7 .5 GLOBAL 6 6 0.1 .5 '•• HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 7 7 0.1 4.2 .5 ••' Input sequence (UCI) for current land-use conditions END HYDR-PARM2 •'• Without Wetland Mitigation Bank Site 2 SPRINGBROOK CREEK - Current Conditions - HSPF Model for Long Runs HYDR-INIT START 1961/10/01 00:00 END 1991/09/30 24:00 RCHRES Initial conditions for HYDR ••• RUN INTERP OUTPUT LEVEL 0 # - # VOL Initial value of COLIND ••• Initial value of OUTDGT RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 (ac-ft) for each possible exit •" for each possible exit END GLOBAL EX1 EX2 EX3 EX4 EX5 ••• EX1 EX2 EX3 EX4 EX5 OPN SEQUENCE 1 15 0.1 INGRP INDELT 1:00 END HYDR-INIT RCHRES 5 END RCHRES RCHRES 6 RCHRES 7 FTABLES END INGRP END OPN SEQUENCE FTABLE 6 FILES ROWS COLS •" <FILE> <UN#>, -<----FILE NAME----------------------------------------------> 15 4 WDM 21 d:\wetbank\wetbank.wdm DEPTH AREA VOLUME OUTFLOW •`• MESSU 22 sbrk_cur.OUT (FT) (ACRES) (AC-FT) (CPS) `•` INFO 23 c:\hspfl0\HSPINF.DA 0.00 0.00 0.00 0.00 ERROR 24 c:\h3pfl0\HSPERR.DA 0.45 0.01 0.02 0.60 WARN 25 c:\hspfl0\HSPWRN.DA 0.90 0.01 0.08 3.60 END FILES 1.35 0.01 0.15 9.00 1.80 0.01 0.23 15.60 2.25 0.01 0.30 24.00 RCHRES 2.70 0.01 0.37 33.00 ACTIVITY 3.15 0.01 0.45 42.00 RCHRES Active Sections (1-Active; O=Inactive) •" 3.60 0.01 0.52 51.60 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG •`• 4.05 0.01 0.58 57.00 1 162 1 4.50 0.01 0.60 60.00 END ACTIVITY 5.00 0.10 0.63 61.00 6.00 2.00 1.68 62.00 PRINT-INFO 10.00 4.00 13.68 66.00 Print-flags '•' 12.00 20.00 37.68 70.00 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PINK PH PIVL PYR ••• END FTABLE 6 1 162 6 9 END PRINT-INFO FTABLE 7 GEN-INFO ••• STCORR 4.20 RCHRES<-------Name------->Nexit Unit Systems Printer ••• ••• HEC2 - Springbrook Creek at SW34th Street # _ # User t-series Engl Metr LKFG ••• ROWS COLS ••• in out ••` 13 4 5 Sub-Basin S5 1 1 1 1 0 0 0 DEPTH AREA VOLUME OUTFLOWI ••• 6 Sub-Basin S6 1 1 1 1 0 0 0 (FT) (ACRES) (AC-FT) (CPS) `•• 7 Sub-Basin S7 1 1 1 I 0 0 0 0.0 0.00 0.00 0.0 END GEN-INFO 1.6 1.37 1.69 20.0 2.1 1.42 2.42 40.0 HYDR-PARM1 2.5 1.47 3.01 60.0 RCHRES Flags for HYDR section •'• 2.9 1.50 3.55 80.0 # - # VC Al A2 A3 ODFVFG for each ODGTFG for each ••• FUNCT for each 4.3 1.82 5.86 159.0 FG FG FG FG possible exit possible exit ••• possible exit 6.7 2.38 10.88 318.0 1 2 3 1 2 3 4 5 1 2 3 4 5 ••' 8.6 2.84 15.76 477.0 10.4 3.26 21.16 636.0 5 0 1 0 0 4 11.4 4.75 24.75 795.0 6 0 0 0 0 4 13.3 72.22 88.48 1193.0 7 0 1 0 0 4 13.9 117.12 156.97 1590.0 END HYDR-PAkMI 13.9 117.74 166.84 1749.0 END FTABLE 7 HYDR-PARM2 RCHRES ••• FTABLE 5 # - # DSN FTBN LEN DELTH STCOR KS '•• `•• STCORR 4.70 Date: 03/22/95 File name: SBRK CUR.INP Page 3 Date: 03/22/95 File name: SBRK CUR.INP Page 4 ••• HEC2 - Springbrook Creek at Oakesdale Ave MASS-LINK 1 ROWS COLS "' <Srce> <-Grp> <-Member-><--Mult--> <Targ> <-Grp;, <-Member-> ••• 13 4 <Name> <Name> <Name> 4 4<-f6ctor-> <Name> <Name> <Name> { / +•• DEPTH AREA VOLUME OUTFLOWI ••• RCHRES ROFLOW RCHRES INFLOW (FT) (ACRES) (AC-FT) (CPS) +•• END MASS-LINK 1 0.0 0.00 0.00 0.0 1.8 0.94 1.10 18.0 END NASS-LINK 2.4 0.96 1.66 36.0 2.9 0.98 2.12 54.0 END RUN 3.3 1.01 2.53 72.0 4.7 1.28 4.19 145.0 7.2 1.77 7.91 290.0 9.4 2.35 12.30 434.0 11.6 2.95 18.04 579.0 12.9 11.48 22.92 724.0 14.1 35.57 59.22 1086.0 14.8 90.87 84.55 1448.0 15.0 42.06 93.33 1593.0 6ND FTABL6 5 ENO FTABLES EXT SOURCES <,Jolume-> [Member, SsYaSgap<.^Mult--14ran <-Ta19et V0137 <-Grp> e-M9mbQr,7 ... <00me> I [Name, # cam strg<.factor->srrg <Name2 4 / LName> 4 EXTERNAL REACHES +.. .' SPRING000K CREEL` TO REACO 5 AND p6¢ S-4- Wpo 204 fLOW 6NGL 0.082645 RCHR65 5 EXTNL fVOL ' MILL CREEK TO REACH 5 AND FEQ M-19 WLO 219 FLOW 6NGL 0.082645 ACHR55 5 EXTNL fVOL �,'( UPPER SFRINGBROOI WETLAND OVERFLOW TO REACH 6 WV' 232 fLOW 6NGL 0-182645 RCHR65 6 EXTNL fVOL ', BASINS S116BASIN ..' SS WDo 144 FERO 6NGL 2.6637 RCHR65 S EXTNL fVOL WOE" 145 PRO 6NGL 1.S6S7 RCHR65 5 EXTNL fVOL S1168ASIN ..' S6 wvo 140 fERO 6NGL 1.2500 RCHR65 6 EXTNL fVOL W00 144 fERO 6`NNGL 1.6710 RCHR65 6 EXTNL fVOL 145 yURO p GL 16.1873 RCHR65 6 EXTNL fVOL 8 ♦ S7 5110 �I14q.fEROa 6NGL 3.27g5 RCHR66 7 EXTNL fVOL wV� 145 6URO 6NGL 1.2895 RCHR66 7 EXTNL %VOL EtJ� EXT SOURCES T TARG EXJolumeE>S6-Grp, < I4ember-�< 'Mult_-,,Tjan <-Vcrg ol`1me-> <MBr> Ts�s Tgap And .+. pine), N R <N/me> 4 N<ifdctar->3 <Name� 281 <N's> t,m atrAr g gcpp'•. RCORES S �YDR RO WON 205 FLOW ENOL GR ADD R60RES 7 OYDR RO GE WDy 291 FAG PNeL AGGR'OD R6OAEXT TApoETS STP WDM STA ENS GGR pA E MATIC A SLlo rea-- et, -> <'.me>e > <-Tafo > <� ++. RE 4 <-f�' r-> <Namo N ReORES ORES 5 RCHR67 7 i Erl g EMATfC CHR6 ?S-LINK Date: 03/22/95 File name: SBRK FUT.INP Page 1 Date: 03/22/95 File name: SBRK FUT.INP Page 2 RUN 6 6 0.1 .5 GLOBAL 7 7 0.1 4.2 .5 •" HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 END HYDR-PARM2 •'• Input sequence (UCI) for future land-use conditions ••• Without Mitigation Bank Site 2 HYDR-INIT SPRINGBROOK CREEK - Future Conditions - HSPF Model for Long Runs RCHRES Initial conditions for HYDR START 1961/10/01 00:00 END 1991/09/30 24:00 N - 4 VOL Initial value of COLIND `•• Initial value of OUTDGT RUN INTERP OUTPUT LEVEL 0 (ac-ft) for each possible exit ••• for each possible exit RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 EX1 EX2 EX3 EX4 EX5 ... EX1 EX2 EX3 EX4 EX5 END GLOBAL 1 15 0.1 OPN SEQUENCE END HYDR-INIT INGRP INDELT 1:00 END RCHRES RCHRES 5 RCHRES 6 FTABLES RCHRES 7 END INGRP END OPN SEQUENCE FTABLE 6 ROWS COLS ••• FILES 15 4 <FILE> <UN4>••'<----FILE NAME-------------------------------------------------> DEPTH AREA VOLUME OUTFLOW ••• WDM 21 d:\wetbank\wetbank.wdm (FT) (ACRES) (AC-FT) (CPS) ••• MESSU 22 sbrk_FUT.OUT 0.00 0.00 0.00 0.00 INFO 23 c:\hspfl0\HSPINF.DA 0.45 0.01 0.02 0.60 ERROR 24 c:\hspfl0\HSPERR.DA 0.90 0.01 0.08 3.60 WARN 25 c:\hspfl0\HSPWRN.DA 1.35 0.01 0.15 9.00 END FILES 1.80 0.01 0.23 15.60 • 2.25 0.01 0.30 24.00 RCHRES 2.70 0.01 0.37 33.00 ACTIVITY 3.15 0.01 0.45 42.00 RCHRES Active Sections (1-Active; 0=Inactive) ••. 3.60 0.01 0.52 51.60 / - 4 HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ••• 4.05 0.01 0.58 57.00 1 162 1 4.50 0.01 0.60 60.00 END ACTIVITY 5.00 0.10 0.63 61.00 6.00 2.00 1.68 62.00 PRINT-INFO 10.00 4.00 13.68 66.00 Print-flags ••' 12.00 20.00 37.68 70.00 4 - 4 HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PH PIVL PYR •" END FTABLE 6 1 162 6 9 FTABLE 7 END PRINT-INFO •" STCORR 4.20 ••' HEC2 - Springbrook Creek at SW34th Street GEN-INFO ROWS COLS '•' RCHRES-------Name------->Nexit Unit Systems Printer ••• 13 4 - 4 User t-series Engl Metr LKFG ••• DEPTH AREA VOLUME OUTFLOWI '•• in out •'• (FT) (ACRES) (AC-FT) (CPS) ••* 5 Sub-Basin S5 1 1 1 1 0 0 0 0.0 0.00 0.00 0.0 6 Sub-Basin S6 1 1 1 1 0 0 0 1.6 1.37 1.71 21.0 7 Sub-Basin S7 1 1 1 1 0 0 0 2.1 1.42 2.45 41.0 END GEN-INFO 2.5 1.47 3.03 62.0 2.8 1.50 3.55 82.0 HYDR-PARMI 4.2 1.82 5.83 164.0 RCHRES Flags for HYDR section ••• 6.7 2.37 10.80 328.0 p - 4 VC Al A2 A3 ODFVFG for each ODGTFG for each ••• FUNCT for each 8.6 2.84 15.76 493.0 FG FG FG FG possible exit possible exit ••• possible exit 10.4 3.27 21.26 657.0 1 2 3 1 2 3 4 5 1 2 3 4 5 ••• 11.4 5.38 24.98 821.0 13.1 68.64 79.11 1232.0 5 0 1 0 0 4 13.9 117.17 158.50 1642.0 6 0 0 0 0 4 13.9 117.75 168.00 1806.0 7 0 1 0 0 4 END FTABLE 7 END HYDR-PARM1 FTABLE 5 HYDR-PARM2 ••• STCORR 4.70 RCHRES •'• "• HEC2 - Springbrook Creek at Oakesdale Ave N - 4 DSN FTBN LEN DELTH STCOR KS *•• ROWS COLS ••• 5 5 0.1 4.7 .5 13 4 Date: 03/22/95 File name: SBRK FUT.INP Page 3 Date: 03/22/95 File name: SBRK FUT.INP - Page 4 DEPTH AREA VOLUME OUTFLOWI •+• END MASS-LINK 1 (FT) (ACRES) (AC-FT) (CFS) •+' 0.0 0.00 0.00 0.0 END MASS-LINK 1.9 0.94 1.15 20.0 2.5 0.97 1.70 39.0 END RUN 2.9 0.99 2.17 59.0 3.3 1.02 2.59 78.0 4.7 1.28 4.28 156.0 7.2 1.78 8.04 312.0 9.5 2.39 12.64 469.0 11.9 3.00 18.76 625.0 13.0 16.01 24.55 781.0 14.2 36.31 61.78 1172.0 14.9 41.84 90.16 1562.0 15.1 54.33 100.30 1718.0 END FTABLE 5 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> '•' <Name> 4 <Name> 4 tem strg<-factor->strg <Name> N # <Name> N 4 `•' EXTERNAL REACHES '++ ••• SPRINGBROOK CREEK TO REACH 5 WDM 304 FLOW ENGL 0.082645 RCHRES 5 EXTNL IVOL - MILL CREEK TO REACH 5 WDM 319 FLOW ENGL 0.082645 RCHRES 5 EXTNL IVOL •'' BASINS SUBBASIN '•' S5 - WDM 144 PERO ENGL 1.7400 RCHRES 5 EXTNL IVOL WDM 145 SURO ENGL 2.4933 RCHRES 5 EXTNL IVOL SUBBASIN •++ S6 WDM 140 PERO ENGL 0.0750 RCHRES 6 EXTNL IVOL WDM 141 PERO ENGL 1.3038 RCHRES 6 EXTNL IVOL WDM 144 PERO ENGL 4.4385 RCHRES 6 EXTNL IVOL WDM 145 SURD ENGL 20.1578 RCHRES 6 EXTNL IVOL SUBBASIN ••• S7a WDM 144 PERO ENGL 2.2754 RCHRES 7 EXTNL IVOL WDM 145 SURD ENGL 5.4329 RCHRES 7 EXTNL IVOL END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd <Name> 4 <Name> 11<-factor->strg <Name> I <Name> tem strg strg`+` RCHRES 5 HYDR RO WDM 389 FLOW ENGL AGGR ADD RCHRES 6 HYDR RO WDM 306 FLOW ENGL AGGR ADD RCHRES 7 HYDR RO WDM 390 FLOW ENGL AGGR ADD RCHRES 7 HYDR STAGE WDM 391 STAG ENGL AGGR ADD END EXT TARGETS SCHEMATIC <-Source-> <--Area--> <-Target-> <ML-> `•` <Name> / <-factor-> <Name> N / +•• RCHRES 5 RCHRES 7 1 RCHRES 6 RCHRES 7 1 END SCHEMATIC MASS-LINK MASS-LINK 1 <Srce> <-Grp> <-Member-><--Mult--> <Targ> <-Grp> <-Member-> ••• <Name> <Name> <Name> / 4<-factor-> <Name> <Name> <Name> 8 RCHRES ROFLOW RCHRES INFLOW Date: 03/22/95 File name: BANK CUR.INP Page 1 Date: 03/22/95 File name: BANK CUR.INP Page 2 RUN (ac-ft) for each possible exit *•• for each possible exit GLOBAL EX1 EX2 EX3 EX4 EX5 • EX1 EX2 EX3 EX4 EX5 ••• HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 1 15 0.1 '•• Input sequence (UCI) for current land-use conditions END HYDR-INIT `•• With Wetland Mitigation Bank Site 2 END RCHRES SPRINGBROOK CREEK - Current Conditions - HSPF Model for Long Runs START 1961/10/01 00:00 END 1991/09/30 24:00 FTABLES RUN INTERP OUTPUT LEVEL 0 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 END GLOBAL FTABLE 7 OPN SEQUENCE ••• STCORR 4.20 INGRP INDELT 1:00 ••• HEC2 - Springbrook Creek at SW34th Street with Bank Volume RCHRES 7 ROWS COLS ••• END INGRP 13 4 END OPN SEQUENCE DEPTH AREA VOLUME OUTFLOWI ••* (FT) (ACRES) (AC-FT) (CPS) ••• FILES 0.0 0.00 0.00 0.0 <FILE> <UN#>•*`<----FILE NAME-------------------------------------------------> 1.6 1.37 1.69 20.0 WDM 21 d:\wetbank\wetbank.wdm 2.1 1.42 2.82 40.0 MESSU 22 bank_cur.OUT 2.5 1.47 3.91 60.0 INFO 23 c:\hspfl0\HSPINF.DA 2.9 1.50 5.05 80.0 ERROR 24 c:\hspfl0\HSPERR.DA 4.3 1.82 11.56 159.0 WARN 25 c:\h3pfl0\HSPWRN.DA 6.7 2.38 31.68 318.0 END FILES 8.6 2.84 56.76 477.0 10.4 3.26 83.56 636.0 11.4 4.75 100.15 795.0 RCHRES 13.3 72.22 190.08 1193.0 ACTIVITY 13.9 117.12 265.47 1590.0 RCHRES Active Sections (1-Active;�0=Inactive) `•• 13.9 117.74 275.34 1749.0 4 - % HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG `•* END FTABLE 7 1 162 1 END ACTIVITY END FTABLES PRINT-INFO Print-flags *•` EXT SOURCES 4 - N HYDR ADCA CONS HEAT SED GQL OXRX NUTR PINK PH PIVL PYR *'* <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ••• 1 162 6 9 <Name> 4 <Name> 4 tem strg<-factor->strg <Name> 4 N <Name> 4 4 ••• END PRINT-INFO EXTERNAL REACHES ••. ••• SPRINGBROOK CREEK TO REACH 7 GEN-INFO WDM 289 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL RCHRES<-------Name------->Nexit Unit Systems Printer *•* *** REACH 6 4 - / User t-series Engl Metr LKFG *•• WDM 206 FLAW ENGL 0.082645 RCHRES 7 EXTNL IVOL in out *•* '*• BASINS 7 Sub-Basin S7 1 1 1 1 0 0 0 SUBBASIN **• S7a END GEN-INFO WDM 144 PERO ENGL 3.2795 RCHRES 7 EXTNL IVOL WDM 145 SURD ENGL 1.2895 RCHRES 7 EXTNL IVOL HYDR-PARM1 END EXT SOURCES RCHRES Flags for HYDR section `*• 4 - / VC Al A2 A3 ODFVFG for each ODGTFG for each ••• FUNCT for each FG FG FG FG possible exit possible exit `•• possible exit EXT TARGETS 1 2 3 1 2 3 4 5 1 2 3 4 5 ••• <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ••• <Name> I <Name> A 4<-factor->strg <Name> 4 <Name> tem strg strg••• 7 0 1 0 0 4 RCHRES 7 HYDR RO WDM 590 FLOW ENGL AGGR ADD END HYDR-PARM1 RCHRES 7 HYDR STAGE WDM 591 STAG ENGL AGGR ADD END EXT TARGETS HYDR-PARM2 •.• RCHRES **• END RUN / - 4 DSN FTBN LEN DELTH STCOR KS `•* 7 7 0.1 4.2 .5 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for HYDR ••• / - q VOL Initial value of COLIND ••• Initial value of OUTDGT Date: 03/22/95 File name: BANK FUT.INP Page 1 Date: 03/22/95 File nnme: BANK FUT.INP Page 2 RUN EX1 EX2 EX3 EX4 EX5 ••• EX1 EX2 EX3 EX4 EX5 GLOBAL 1 15 0.1 ' HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 END HYDR-SNIT ••' Input sequence (UCI) for future land-use conditions END RCHRES *'; With Mitigation Bank Site 2 S PRINGBROOK CREEK - Future Conditions - HSPF Model for Long Runs FTABLES START 1961/10/01 00:00 END 1991/09/30 24:00 RUN INTERP OUTPUT LEVEL 0 FTABLE 7 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 ••• STCORR 4.20 END GLOBAL "• HEC2 - Springbrook Creek at SW34th Street OPN SEQUENCE ROWS COLS ••• INGRP INDELT 1:00 13 4 RCHRES 7 DEPTH AREA VOLUME OUTFLOW ••• END INGRP (FT) (ACRES) (AC-FT) (CPS) '`• END OPN SEQUENCE 0.0 0.00 0.00 0.0 1.6 1.37 1.71 21.0 FILES 2.1 1.42 2.85 41.0 <FILE> <UN#>•••<----FILE NAME-------------------------------------------------> 2.5 1.47 3.93 62.0 WDM 21 d:\wetbank\wetbank.wdm 2.8 1.50 4.85 82.0 MESSU 22 bank_FUT.OUT 4.2 1.82 11.13 164.0 INFO 23 c:\h3pfl0\HSPINF.DA 6.7 2.37 31.60 328.0 ERROR 24 c:\hspfl0\HSPERR.DA 8.6 2.84 56.76 493.0 WARN 25 c:\hspfl0\HSPWRN.DA 10.4 3.27 83.66 657.0 END FILES 11.4 5.36 100.38 821.0 13.1 68.64 177.91 1232.0 RCHRES 13.9 117.17 267.00 1642.0 ACTIVITY 13.9 117.75 276.50 1806.0 RCHRES Active Sections (1=Active; 0=Inactive) ••• END FTABLE 7 # - # HYFG ADFG CNFG HTFG SDFG GQFO OXFG NUFG PKFG PHFG +•• END FTA13LES 1 162 1 END ACTIVITY EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ••• PRINT-INFO <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # 0 ••• Print-flags •`• ••• SPRINGBROOK CREEK TO REACH 7 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PH PIVL PYR ••• WDM 389 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL 1 162 6 9 •+• SubBasin S6 TO REACH 7 END PRINT-INFO WDM 306 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL •+• BASINS GEN-INFO SUBBASIN •" S7a RCHRES-------Name------->Nexit Unit Systems Printer `•• WDM 144 PERO ENGL 2.2754 RCHRES 7 EXTNL IVOL # - # User t-series Engl Metr LKFG +•• WDM 145 SURD ENGL 5.4329 RCHRES 7 EXTNL IVOL in out ••• END EXT SOURCES 7 Sub-Basin S7 1 1 1 1 0 0 0 END GEN-INFO EXT TARGETS HYDR-PARM1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ••• RCHRES Flags for HYDR section ••• <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg'•• # - # VC Al A2 A3 ODFVFG for each ODGTFG for each '•• FUNCT for each RCHRES 7 HYDR RO WDM 690 FLOW ENGL AGGR REPL FG FG FG FG possible exit possible exit •" possible exit RCHRES 7 HYDR STAGE WDM 691 STAG ENGL AGGR REPL 1 2 3 1 2 3 4 5 1 2 3 4 5 ••` END EXT TARGETS 7 0 1 0 0 4 END HYDR-PARMl END RUN HYDR-PARM2 RCHRES ••• # - # DSN FTBN LEN DELTH STCOR KS •`• 7 7 0.1 4.2 .5 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for HYDR •+• # - # VOL Initial value of COLIND •`• Initial value of OUTDGT (ac-ft) for each possible exit •+• for each possible exit Date: 03/22/95 File name: DUR ANN.INP Page 1 Date: 03/22/95 File name: DUR ANN.INP Page 2 RUN WDM 391 STAG ENGL 1.00 DURANL 3 INPUT TIMSER GLOBAL WDM 691 STAG ENGL 1.00 DURANL 4 INPUT TIMSER ..' ESG Wetland Existing Conditions Stage Duration NHC INC. 3/31/95 END EXT SOURCES ESG Wetland Existing Conditions Stage Duration NHC INC. 3/31/95 START 1961/10/01 00:00 END 1991/09/30 24:00 END RUN RUN INTERP OUTPUT LEVEL 0 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 END GLOBAL OPN SEQUENCE INGRP INDELT 1:00 DURANL 1 DURANL 2 DURANL 3 DURANL 4 END INGRP END OPN SEQUENCE FILES <FILE> <UN#>...<----FILE NAME-------------------------------------------------> WDM 21 d:\wetbank\wetbank.wdm MESSU 22 dur_ann.OUT 52 dur_ann.drl 53 dur_ann.dr2 54 dur_ann.dr3 55 dur_ann.dr4 INFO 23 c:\hspfl0\HSPINF.DA ERROR 24 c:\hspfl0\HSPERR.DA WARN 25 c:\hspfl0\HSPWRN.DA END FILES DURANL GEN-DURDATA 123456789012345678901234567890123456789012345678901234567890 ..' 4thru#< title > ndur nlev prfg punt ... 1 Stage in Wetland C No bank(Annual) 1 20 1 52 2 Stage in Wetland C W/bank (Annual) 1 20 1 53 3 Stage in Wetland F No bank(Annual) 1 20 1 54 4 Stage in Wetland F w/bank (Annual) 1 20 1 55 END GEN-DURDATA SEASON "• Start End 4thru4'•' mo da hr mn mo da hr mn 5 11 2 6 3 10 1 4 10 01 00 9 30 24 END SEASON DURATIONS 4thru4"'< --- durations ---> 1 4 1 END DURATIONS LEVELS /thrup•'• 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Ithru4'•' 15 16 17 18 19 20 1 4 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 1 4 11.5 12.0 13.0 14.0 15.0 16.0 END LEVELS END DURANL EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> "+ <Name> 4 <Name> 4 tem strg<-factor->strg <Name> 4 t <Name> 1 4 WDM 291 STAG ENGL 1.00 DURANL 1 INPUT TIMSER WDM 591 STAG ENGL 1.00 DURANL 2 INPUT TIMSER 3 z gl9s F'Y TR ANSMITTAL MEMO Y of pages - e lI 1 PLAA sc F/NA-t.i -2:-rz A.-�o Rh rig March 22, 1995 714^'J/CS- R�► Scott Woodbury City of Renton /NC l v►� IiuDn►. Department of Public Works (A5( HSP� �N 200 Mill Ave S, 4th Floor ANC N�`�, 4 t Gt'u of Renton WA 98055 Pw-M �NfA �'� � cor- Subject: Mitigation Bank Site 2 Reconnaissance Level Analysis � 101N- FIB � Dear Scott We have completed our reconnaissance level review of the hydrologic im.paetsof the proposed l Mitigation Bank Site 2 between Oakesdale Avenue and SW 34th Street . As specified in our contract we have conducted flood frequency analyses of flows upstream of SW 34th Street and stage inundation analyses of simulated water levels near the location of the proposed bank for current and future land-use scenarios. In addition, we developed stage frequency and stage duration analyses of water levels in Springbrook Creek at the site of the proposed mitigation bank. The results are shown in Figures 1 through 10 and Tables 1 through 6, and are discussed in greater detail below. Methodology: The HSPF User control input files (UCIs) developed by Northwest Hydraulic Consultants (NHC) for the present East Side Green River Watershed Project (ESGRWP) hydrologic analyses (City of Renton Contract CAG-90-033) provided the basis for this modeling effort. These were adapted as necessary to investigate the following four scenarios: Current land-use without the proposed mitigation bank Future land-use without the proposed mitigation bank Current land-use with the proposed mitigation bank Future land-use with the proposed mitigation bank The first two scenario's, without the mitigation bank, correspond to the current and future hydrologic analyses being conducted for the ESGRWP. The HSPF models for those analyses were used directly without modification. Flows in Mill and Springbrook Creeks at their confluence were extracted from hydrologic analyses currently being performed by NHC for the City of Kent. Current conditions overflows from Upper Springbrook Creek upstream of SR 167 into Springbrook Creek sub-basin S6 were also extracted from the City of Kent analyses and used as input to the HSPF simulations. number of hours that the stage exceeded user defined limits. The program further computes the number of events of specified duration (in hours) for which the stage limit is exceeded. The output from ELDUR is a matrix of event-depth-duration data which facilitates comparison of the hydrologic performance of the wetland with and without the proposed bank. ELDUR analyses were run for the four scenarios for annual and seasonal periods. The three seasons investigated were from October 1 through December 31, March 1 through May 31, and July 1 through September 30. The results of these analyses are shown in Tables 2 through 5 (note that Tables 2 through 5 have multiple pages). Generally the water levels upstream of SW 34th Street would not rise as high nor remain high as long with the proposed bank. Specific comparisons can be made by comparing the results in Table 2 with those in Table 3 for the current land-use condition, and the results in Table 4 with the results in Table 5 for the future land-use condition. It is beyond NHC's area of expertise to interpret the wetland impacts of the hydrologic changes shown in Tables 2 through 5. Digital copies of the ELDUR input and output files are provided on the attached diskette along with a copy of the latest version of the ELDUR program. Peak Stage Analysis: In addition to the analyses described above, analysis of peak stages was conducted. Simulated annual peak stages at the SW 34th Street site were extracted from the WDM file and analyzed using NHC's PLOT_CDF flood frequency program. Plots of the simulated flow data and computed Log Pearson Type III probability distribution are shown in Figures 7 and 8. Peak stage quantiles for the four scenarios are summarized in Table 6. As shown in Figures 7 and 8, simulated peak annual stages are reduced slightly by the proposed mitigation bank. For current land-use conditions the mitigation bank would lower peak stage quantiles by approximately 1 % for return periods between 2- and 100-years. The future land- use stage quantiles shown in Table 6 show a similar increase at higher recurrence intervals to that shown in the flow analysis. As discussed above this is an artifact of the theoretical distribution rather than an indication that peak stages will be increased with the proposed bank. In general, the proposed bank will cause somewhat lower peak stages (up to I"foot) for events of about a 2-year recurrence but it will have very little impact on peak stages associated with the most severe events (i.e. the simulated stage for the January 9 1990 event is reduced by only 0.02 feet). This indicates that the additional volume provided by the mitigation bank is adequate for moderate events but is insignificant compared to the simulated runoff volume in the most severe events. Stage Duration Analysis: The final analysis conducted was duration analysis of simulated stages upstream of SW 34th Street. Using HSPF the simulated stage data was processed to compute the percentage of the simulation period that specified stages were exceeded. The results of this analysis were plotted as shown in Figures 9 and 10. Basically the mitigation bank will have an imperceptible effect on stage durations except at the highest stages (those attained less than 0.1 % of the time). For the highest stages the stage at a given duration may be reduced by up to 6 inches with the proposed bank. Note that these high stages are exceeded on average less than 10 hours per year. S Ca �'6NM nt 2 L�55 'tot" �_ Table 1 Peak Flow Analysis- Wetland Mitigation Bank Site 2 Peak Flow (cfs) at Return Period (yrs) Scenario 2 10 25 50 100 Current Land-use,No bank 355 570 698 803 917 Current Land-use, With bank 342 547 672 776 890 Change in Flow Quantile(%) -3.8% -4.0% -3.7% -3.4% -3.0% Fu-r vR� �Land-use,No bank 585 824 930 1005 1076 �ufuf-,L � Land-use,With bank 530 787 926 1033 1144 Change in Flow Quantile(%) -9.3% -4.5% -0.5% 2.8%� -6.3 Ip FL A'T )C(JUT/Ja rj aft Qi/ To u_'VfA wry 774 6E 4 A-6- Pi U7 Table 6 Peak Stage Analysis - Wetland Mitigation Bank Site 2 Peak Flow (cfs) at Return Period (yrs) Scenario 2 10 25 50 100 Current Land-use, No bank 11.38 13.80 15.04 15.96 16.89 Current Land-use,With bank 11.20 13.58 14.82 15.76 16.72 Change in Stage Quantile (%) -1.6% -1.6% -1.4% -1.3% -1.0% Current Land-use,No bank 13.80 15.74 16.46 16.92 17.33 Current Land-use,With bank 13.22 15.47 16.47 17.18 17.87 Change in Stage Quantile (%) -4.2% -1.8% 0.1% .6% 3.1% foe,r*-drc o2 We -7;41�s� PL.,JS EXCEEDANCE FREQUENCY IN PERCENT 98 95 90 80 70 60 50 40 30 20 10 5 2 1 .5 .2 F L O W I N o'A I F S <:. .............:.............:...:...,,..::ti<::......::::k<:: - -- Flow Frequency (with Exp. Prob. ) HSPF Simulations ■ User Defined Positions Springbrook Creek at ........ 5% and 95% Confidence Limits > > SW 34th Street FREQUENCY STATISTICS Future LU NO Bank LOG TRANSFORM OF FLOW, CFS NUMBER OF EVENTS Y MEAN 2.7648 HISTORIC EVENTS o WATER YEARS IN RECORD STANDARD DEV .1192 HIGH OUTLIERS 0 1962-1991 SKEW -.0904 LOW OUTLIERS 0 REGIONAL MAP SKEW -- ZERO OR MISSING 0 ADOPTED SKEW -.1000 SYSTEMATIC EVENTS 30 17.0 16.0 Current LU without Mitigation Bank -- -- Current LU with Mitigation Bank 15.0 14.0 ' 13.0 o_ 12.0 W > 11.0 Z 10.0 3" 9.0 8.0 7.0 6.0 5.0 4.0 10 5 104 10-3 10-2 10 1 104 ° �°� Exceedence Probability(p) 7/� (W A/�) ESGRW Mitigation Bank Site 2 - Wetland Stage Duration Analysis Springbrook Creek at SW 34th Street Annual Comparison 17.0 16.0 Future LU without 1V>~itigation Bank 15.0 --,lj(-- Future LU with Mitigation Bank 14.0 13.0 o_ 12.0 W > 11.0 z 10.0 a 9.0 8.0 7.0 6.0 5.0 .� 4.0 10' 104 10 3 10 10 1 100 Z� r Exceedence Probability(p) ESGRW Mitigation Bank Site 2 -Wetland Stage Duration Analysis Springbrook Creek at SW 34th Street Annual Comparison Transmittal Letter northwest hydraulic consultants inc. 22017 70th Avenue South Kent Washington 98032 (206) 872-0218 (206) 872-0518 fax Date ';/22 '95 Job No. 2O441 To Sed (Jrrood6 uu r _Ci+14 off' Renton Regarding Wetland Kfraaflan Bank S+feji engineering L)ept We Are Sending IA attached ❑ separate by Description `draft Mxoa}ion *9anK 2 Teehni cal Memurdndjm Mote: Fiayres are not 6WW uel' ownd disk raid') ►Inputs/ ,,*vts not melt ded ►n draft su6mi#a i This is ❑ as requested ❑ for your use ❑ for approval Ed for review and comment Remarks Pleose review and call wi}k an u comment or rptyrn ru vp5 -Ire me -far updat,na , Thanks From LAuRg KRRFaC V Copy To T:i le 7,0441 7 The final two scenario's, with the proposed mitigation bank, required modification of the Stage/Storage/Discharge relationship (FTABLE) for Springbrook Creek at SW 34th Street. The FTABLE was modified by adding the additional storage available in the mitigation bank to the HEC-2 computed storage in the channel at the corresponding stage. Note that this manner of incorporating the mitigation bank storage is physically equivalent to having unconstrained inflows and outflows from the mitigation bank (i.e. no hydraulic losses). In actuality, the connections to and from the mitigation bank site would cause at least some head loss and the results would be affected accordingly. The final HSPF UCI files are provided in text form in Appendix A and digital form on the attached diskette. Using these files, hydrologic simulations were run for each scenario for the period October 1961 through September 1991. Flows at the SW 34th Street culvert and stages upstream of SW 34th Street were computed and stored in a watershed data management (WDM) file. Annual peak stages and peak water surface elevations were extracted from the WDM file and analyzed to determine the 2-, 10-, 25-, and 100-year flow and stage quantiles. The stage data were also processed using an NHC developed stage duration program (ELDUR) to compute event-depth-duration information for each scenario for annual and seasonal periods. Peak Flow Analysis: Simulated annual peak flows at the SW 34th Street site were extracted from the WDM file and analyzed using the Corps of Engineers HEC-FFA flood frequency program. Plots of the simulated flow data and computed Log Pearson Type III probability distribution are shown in Figures 1 through 4. Peak flow quantiles for the four scenarios are summarized in Table 1. Note that due to a bug in the plotting routine of the HEC-FFA software, the plots for the future land- use scenarios are incomplete. For this reason, and because HEC-FFA does not allow plotting more than one data set per page, additional frequency plots were generated using NHC's own PLOT_CDF program. A comparison of peak flow results for current land-use with and without the mitigation bank is shown in Figure 5. A similar plot for the future land-use scenarios is provided in Figure 6. Digital copies of the HEC-FFA input, output and generated plot files are provided on the attached diskette. As shown in Figures 5 and 6 and Table 1, peak flows are not significantly altered by the proposed mitigation bank. For current land-use conditions the mitigation bank would lower peak flow quantiles by 3 % to 4 % for return periods between 2- and 100-years. For future land-use conditions the change in peak flow quantiles ranges between a reduction of approximately 10 % for the 2-year flow to an increase of approximately 6 % for the 100-year flow. Note that the increase in flood flow quantiles at the higher recurrence intervals is an artifact of the theoretical frequency distribution. As simulated, the peak flow for each event in the thirty years record is reduced at least slightly. However, the peak flow reductions are most significant for the less severe events. Therefore the theoretical frequency fit for the with bank condition is rotated slightly upward at the high end and extrapolations beyond the simulated data produce higher quantiles than the no bank scenario. Stage Event-Depth-Duration Analysis: The simulated time series of stages upstream of SW 34th Street were processed using an NHC stage analysis program, ELDUR. ELDUR reads the data in the WDM file and computes the total Conclusions: The results of these analyses indicate that the proposed mitigation bank will have a relatively minor hydrologic impact on streamflows and stages at SW 34th Street. Although the bank may provide some reduction in peak flow quantiles for moderate events, it is unlikely to have any discernible impact during severe storms. This is because the additional storage volume in the proposed bank is relatively small compared to the expected runoff volume during a significant event. Finally, note that although Tables 2 through 5 provide some indication of the expected wetland water levels in the proposed bank, the simplifying hydraulic assumptions, both in the use of the HSPF/IIEC-2 models and the assumed connection to the stream channel need to be considered carefully when using this data. Sincerely NORTHWEST HYDRAULIC CONSULTANTS Larry M. Karpack Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 17.768 7.129 3.300 1.289 0.453 0.174 0.084 0.030 0.007 0.000 t >= Critical 46724 18748 8678 3389 1191 458 220 78 19 0 Total Events 1261 1106 575 232 86 35 17 10 4 0 Duration(hr) Events 3 1255 1049 527 200 76 31 16 8 3 ------- 6 1181 866 419 166 65 21 14 5 1 ------- 9 1071 645 321 127 50 18 10 4 ------- ------- 12 944 480 245 98 35 15 9 3 ------- ------- 15 797 381 181 74 27 12 ------- ------- ------- ------- 18 691 322 151 61 22 ------- 6 1 ------- ------- 21 594 263 118 50 18 9 ------- ------- ------- ------- 24 527 223 96 44 15 7 ------- ------- ------- ------- 27 475 189 82 37 12 5 ------- ------- ------- ------- 30 435 159 70 32 10 ------- ------- ------- ------- ------- 33 402 140 64 27 9 ------- ------- ------- ------- ------- 36 368 126 55 25 7 ------- ------- ------- ------- ------- 39 335 100 50 20 6 ------- 1 ------- ------- ------- 42 307 91 49 18 ------- ------- ------- ------- ------- ------- 45 291 83 39 13 3 ------- ------- ------- ------- ------- 48 278 70 32 12 ------- 2 ------- ------- ------- ------- 51 256 68 30 10 ------- ------- ------- ------- ------- ------- 54 245 63 ------- 8 ------- ------- ------- ------- ------- ------- 57 235 56 26 ------- 2 ------- ------- ------- ------- ------- 60 220 52 22 ------- ------- ------- ------- ------- ------- ------- 63 205 44 14 5 ------- ------- ------- ------- ------- ------- 66 191 40 12 ------- 1 ------- ------- ------- ------- ------- 69 186 38 10 3 ------- ------- ------- ------- ------- ------- 72 172 37 8 2 ------- ------- ------- ------- ------- ------- 75 166 29 6 ------- ------- ------- ------- ------- ------- ------- 78 160 27 ------- 1 ------- ------- ------- ------- ------- ------- 81 144 26 ------- ------- ------- ------- ------- ------- ------- ------- 84 139 22 4 ------- ------- ------- ------- ------- ------- ------- 87 130 17 3 ------- ------- ------- ------- ------- ------- ------- 90 126 15 2 ------- ------- ------- ------- ------- ------- ------- 93 121 14 ------- ------- ------- ------- ------- ------- ------- ------- 96 118 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 112 13 ------- ------- ------- ------- ------- ------- ------- ------- 102 102 12 ------- ------- ------- ------- ------- ------- ------- ------- 105 101 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 94 11 ------- ------- ------- ------- ------- ------- ------- ------- ill91 9 ------- ------- ------- ------- ------- ------- ------- ------- 114 83 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 79 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 74 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 72 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 68 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 65 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 62 5 ------- ------- ------- ------- ------- ------- ------- ------- 135 61 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 59 4 ------- ------- ------- ------- ------- ------- ------- ------- 144 56 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 54 ------- ------- ------- ------- ------ ------- ------- ------- ------- 150 51 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 50 3 ------- ------- ------- ------- ------- ------- ------- ------- 156 47 ------- ------- ------- ------ ------- ------- ------- ------- ------- 159 42 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 41 2 ------- ------- ------- ------- ------- ------- ------- ------- 165 39 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 37 ------- ------- ------- ------- ------- ------- ------- ------ 171 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 31 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 28 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 26 ------- ------- ------- ------- ------- ------- ------- ------ 198 25 0 0 0 0 0 0 0 0 0 Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 27.867 11.866 5.818 2.409 0.790 0.270 0.107 0.032 0.008 0.000 t >= Critical 18459 7860 3854 1596 523 179 71 21 5 0 Total Events 527 478 260 121 45 16 7 3 1 0 Duration(hr) Events 3 524 454 237 100 38 14 7 3 1 ------- 6 489 375 184 83 31 9 6 2 ------- ------- 9 451 272 143 62 23 8 ------- ------- ------- ------- 12 399 199 113 46 14 7 3 1 ------- ------- 15 342 157 84 35 11 5 ------- ------- ------- ------- 18 294 136 66 26 9 ------- 1 ------- ------- ------- 21 252 110 48 22 8 4 ------- ------- ------- ------- 24 213 92 38 20 6 2 ------- ------- ------- ------- 27 184 80 32 16 5 1 ------- ------- ------- ------- 30 173 66 ------- 14 4 ------- ------- ------- ------- ------- 33 162 60 28 12 3 ------- ------- ------- ------- ------- 36 149 51 23 11 ------- ------- ------- ------- ------- ------- 39 135 39 ------- 9 2 ------- ------- ------- ------- ------- 42 121 33 22 8 ------- ------- ------- ------- ------- ------- 45 115 31 19 5 1 ------- ------- ------- ------- ------- 48 112 ------- 15 4 ------- ------- ------- ------- ------- ------- 51 105 25 14 ------- ------- ------- ------- ------- ------- ------- 54 102 23 ------- 3 ------- ------- ------- ------- ------- ------- 57 95 ------- 11 ------- ------- ------- ------- ------- ------- ------- 60 87 21 8 ------- ------- ------- ------- ------- ------- ------- 63 79 17 5 2 ------- ------- ------- ------- ------- ------- 66 73 ------- 4 ------- ------- ------- ------- ------- ------- ------- 69 70 16 ------- ------- ------- ------- ------- ------- ------- ------- 72 64 15 ------- ------- ------- ------- ------- ------- ------- ------- 75 62 12 3 ------- ------- ------- ------- ------- ------- ------- 78 60 11 ------- ------- ------- ------- ------- ------- ------- ------- 81 56 10 ------- ------- ------- ------- ------- ------- ------- ------- 84 54 9 ------- ------- ------- ------- ------- ------- ------- ------- 87 49 7 ------- ------- ------- ------- ------- ------- ------- ------- 90 47 ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 43 5 ------- ------- ------- ------- ------- ------- ------- ------- 96 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 37 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 111 31 4 ------- ------- ------- ------- ------- ------- ------- ------- 114 28 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------ ------- ------- ------- 126 21 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 16 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 15 ------- ------- ------- ------- ------ ------- ------- ------- ------- 150 14 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 168 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 10 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 7 0 0 0 0 0 0 0 0 0 Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 13.780 4.612 1.715 0.525 0.208 0.128 0.089 0.038 0.008 0.000 t >= Critical 9128 3055 1136 348 138 85 59 25 5 0 Total Events 294 202 90 24 6 3 2 2 1 0 Duration(hr) Events 3 294 187 81 21 6 ------- ------- 2 1 ------- 6 274 153 59 16 ------- 3 ------- ------- ------- ------- 9 245 114 42 13 4 ------- ------- ------- ------- ------- 12 209 78 32 8 ------- ------- ------- ------- ------- ------- 15 175 62 20 6 3 ------- ------- ------- ------- ------- 18 152 51 19 5 ------- ------- 2 1 ------- ------- 21 127 40 14 ------- ------- ------- ------- ------- ------- ------- 24 109 32 9 ------- ------- ------- ------- ------- ------- ------- 27 101 27 ------- ------- ------- 2 ------- ------- ------- ------- 30 93 23 ------- ------- ------- ------- ------- ------- ------- ------- 33 83 20 ------- ------- ------- ------- ------- ------- ------- ------- 36 76 18 6 ------- ------- ------- ------- ------- ------- ------- 39 69 ------- ------- ------- 2 ------- 1 ------- ------- ------- 42 64 12 ------- 3 ------- ------- ------- ------- ------- ------- 45 61 ------- ------- ------- ------- ------- ------- ------- ------ 48 54 ------- ------- ------- ------- 1 ------- ------- ------- ------- 51 47 11 5 ------- ------- ------- ------- ------- ------- ------- 54 42 10 ------- 2 ------- ------- ------- ------- ------- ------- 57 41 9 4 ------- ------- ------- ------- ------- ------- ------- 60 38 8 3 ------- ------- ------- ------- ------- ------- ------- 63 35 ------- ------- ------- ------- ------- ------- ------- ------ 66 ------- 7 ------- ------- 1 ------- ------- ------- ------- ------- 69 32 ------- 2 ------- ------- ------- ------- ------- ------- ------- 72 29 ------- ------- ------- ------- ------- ------- ------- ------ 75 28 ------- ------- ------- ------- ------- ------- ------- ------ 78 26 ------- ------- 1 ------- ------- ------- ------- ------- ------- 81 23 ------- ------- ------- ------- ------- ------- ------- ------ 84 22 5 ------- ------- ------- ------- ------- ------- ------- ------- 90 21 ------- 1 ------- ------- ------- ------- ------- ------- ------- 93 20 ------- ------- ------- ------- ------- ------- ------- ------ 99 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 16 3 ------- ------- ------- ------- ------- ------- ------- ------- 105 15 ------- ------- ------- ------- ------- ------- ------ ------- ------- 108 14 2 ------- ------- ------- ------- ------- ------- ------- ------- ill13 1 ------- ------- ------- ------- ------- ------- ------- ------- 117 12 ------- ------- ------- ------- ------- ------- ------- ------ 120 10 ------- ------- ------- ------- ------- ------- ------- ------ 126 9 ------- ------- ------- ------- ------- ------- ------- ------ 129 8 ------- ------- ------- ------- ------- ------- ------ ------- ------- 138 7 ------- ------- ------- ------- ------- ------- ------- ------ 144 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 5 ------- ------- ------- ------- ------- ------- ------- ------ 195 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 3 0 0 0 0 0 0 0 0 0 Table 2 Event-Stage-Duration Analysis Current Land-use Without Mitigation Bank NDM filename: d:\wetbank\wetbank.wdm Data Set number: 291 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 3.137 1.135 0.471 0.155 0.027 0.002 0.000 0.000 0.000 0.000 t >= Critical 2078 752 312 103 18 1 0 0 0 0 Total Events 118 75 36 13 2 1 0 0 0 0 Duration(hr) Events 3 116 71 31 10 ------- ------- ------- ------- ------- ------- 6 108 51 24 8 ------- ------- ------- ------- ------- ------- 9 90 33 13 5 ------- ------- ------- ------- ------- ------- 12 78 20 9 4 ------- ------- ------- ------- ------- ------- 15 52 15 6 ------- 1 ------- ------- ------- ------- ------- 18 40 12 4 ------- ------- ------- ------- ------- ------- ------- 21 28 8 ------- 1 ------- ------- ------- ------- ------- ------- 24 24 ------- 2 ------- ------- ------- ------- ------- ------- ------- 27 21 4 1 ------- ------- ------- ------- ------- ------- ------- 30 15 2 ------- ------- ------- ------- ------- ------- ------- ------- 33 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 36 9 1 ------- ------- ------- ------- ------- ------- ------- ------- 39 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 63 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 0 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank NDM filename: d:\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 17.765 7.202 3.290 1.263 0.449 0.171 0.084 0.028 0.006 0.000 t >= Critical 46716 18938 8651 3320 1180 450 220 73 15 0 Total Events 1261 1101 550 201 75 27 15 7 3 0 Duration(hr) Events 3 1250 1049 510 190 72 24 15 7 3 ------- 6 1184 877 412 158 61 21 14 6 1 ------- 9 1069 655 320 128 49 18 10 4 ------- ------- 12 940 492 247 100 35 17 9 3 ------- ------- 15 798 386 185 75 30 14 ------- ------- ------- ------- 18 691 324 152 61 22 10 6 ------- ------- ------- 21 593 266 122 49 18 9 2 1 ------- ------- 24 526 230 100 45 15 7 ------- ------- ------- ------- 27 474 189 84 38 12 5 ------- ------- ------- ------- 30 434 161 72 34 11 4 ------- ------- ------- ------- 33 399 141 64 28 9 ------- ------- ------- ------- ------- 36 363 128 55 25 7 ------- ------- ------- ------- ------- 39 332 103 52 20 6 ------- 1 ------- ------- ------- 42 306 94 49 17 ------- ------- ------- ------- ------- ------- 45 290 84 41 13 3 ------- ------- ------- ------- ------- 48 276 71 36 12 ------- 2 ------- ------- ------- ------- 51 257 68 33 10 ------- 1 ------- ------- ------- ------- 54 245 64 28 9 ------- ------- ------- ------- ------- ------- 57 234 58 27 ------- 2 ------- ------- ------- ------- ------- 60 218 51 23 ------- ------- ------- ------- ------- ------- ------- 63 201 44 14 5 ------- ------- ------- ------- ------- ------- 66 187 41 13 ------- 1 ------- ------- ------- ------- ------- 69 183 38 9 4 ------- ------- ------- ------- ------- ------- 72 171 37 8 3 ------- ------- ------- ------- ------- ------- 75 165 29 7 ------- ------- ------- ------- ------- ------- ------- 78 159 27 ------- ------- ------- ------- ------- ------- ------- ------- 81 145 26 ------- 1 ------- ------- ------- ------- ------- ------- 84 138 21 4 ------- ------- ------- ------- ------- ------- ------- 87 128 18 3 ------- ------- ------- ------- ------- ------- ------- 90 125 15 2 ------- ------- ------- ------- ------- ------- ------- 93 122 ------- ------- ------- ------- ------- ------- ------- ------ 96 117 14 ------- ------- ------- ------- ------- ------- ------- ------- 99 ill 13 ------- ------- ------- ------- ------- ------- ------- ------- 102 104 ------- ------- ------- ------- ------- ------- ------- ------- 105 102 12 ------- ------- ------- ------- ------- ------- ------- ------- 108 93 10 ------- ------- ------- ------- ------- ------- ------- ------- ill90 9 ------- ------- ------- ------- ------- ------- ------- ------- 114 85 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 80 ------- ------- ------- ------- ------- ------- ------- ------ 120 75 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 72 ------- ------- ------- ------- ------- ------- ------- ------- 126 68 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 67 5 ------- ------- ------- ------- ------- ------- ------- ------- 132 63 ------- ------- ------- ------- ------- ------- ------- ------- 135 62 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 60 4 ------- ------- ------- ------- ------- ------- ------- ------- 141 57 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 56 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 55 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 52 ------- ------- ------- ------- ------- ------- ------- ------- 153 50 3 ------- ------- ------- ------- ------- ------- ------- ------- 156 48 ------- ------- ------- ------- ------- ------- ------- ------ 159 43 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 42 2 ------- ------- ------- ------- ------- ------- ------- ------- 165 40 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 39 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 32 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 30 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 28 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 26 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 27.874 12.024 5.797 2.355 0.767 0.258 0.112 0.027 0.006 0.000 t >= Critical 18464 7965 3840 1560 508 171 74 18 4 0 Total Events 531 476 249 103 36 13 7 2 1 0 Duration(hr) Events 3 524 456 229 94 35 10 7 ------- 1 ------- 6 490 378 182 79 29 9 6 2 ------- ------- 9 454 278 146 63 22 8 ------- ------- ------- ------- 12 397 207 115 49 15 7 3 1 ------- ------- 15 341 157 85 36 13 6 ------- ------- ------- ------- 18 294 138 69 27 9 ------- ------- ------- ------- ------- 21 252 113 50 22 8 4 1 ------- ------- ------- 24 213 97 39 20 6 2 ------- ------- ------- ------- 27 187 81 33 17 ------- ------- ------- ------- ------- ------- 30 171 68 29 16 5 1 ------- ------- ------- ------- 33 160 61 28 12 3 ------- ------- ------- ------- ------- 36 148 52 23 11 ------- ------- ------- ------- ------- ------- 39 135 42 22 9 2 ------- ------- ------- ------- ------- 42 122 36 21 7 ------- ------- ------- ------- ------- ------- 45 116 32 20 5 1 ------- ------- ------- ------- ------- 48 113 26 17 4 ------- ------- ------- ------- ------- ------- 51 107 25 15 ------- ------- ------- ------- ------- ------- ------- 54 102 24 ------- 3 ------- ------- ------- ------- ------- ------- 57 97 ------- 11 ------- ------- ------- ------- ------- ------- ------- 60 91 21 8 ------- ------- ------- ------- ------- ------- ------- 63 79 ------- 5 2 ------- ------- ------- ------- ------- ------- 66 71 17 4 ------- ------- ------- ------- ------- ------- ------- 69 69 16 ------- ------- ------- ------- ------- ------- ------- ------- 72 63 15 ------- 1 ------- ------- ------- ------- ------- ------- 75 61 12 3 ------- ------- ------- ------- ------- ------- ------- 78 59 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 56 11 ------- ------- ------- ------- ------- ------- ------- ------- 84 54 8 ------- ------- ------- ------- ------- ------- ------- ------- 87 49 7 ------- ------- ------- ------- ------- ------- ------- ------- 90 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 44 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 42 5 ------- ------- ------- ------- ------- ------- ------- ------- 99 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 36 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- ill29 4 ------- ------- ------- ------- ------- ------- ------- ------- 114 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 16 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 14 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 10 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 7 0 0 0 0 0 0 0 0 0 Table 3 Event-Stage-Duration Analysis Current Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 13.767 4.633 1.698 0.525 0.205 0.131 0.089 0.042 0.006 0.000 t >= Critical 9119 3069 1125 348 136 87 59 28 4 0 Total Events 294 198 84 22 6 3 2 2 1 0 Duration(hr) Events 3 292 185 80 20 5 ------- ------- ------- 1 ------- 6 274 153 57 16 4 3 ------- 2 ------- ------- 9 242 114 40 13 ------- ------- ------- ------- ------- ------- 12 208 79 31 8 ------- ------- ------- ------- ------- ------- 15 179 64 21 6 3 ------- ------- ------- ------- ------- 18 154 50 18 5 ------- ------- 2 ------- ------- ------- 21 127 41 15 ------- ------- ------- ------- 1 ------- ------- 24 109 33 11 ------- ------- ------- ------- ------- ------- ------- 27 99 27 7 ------- ------- ------- ------- ------- ------- ------- 30 92 23 ------- ------- ------- 2 ------- ------- ------- ------- 33 83 20 ------- ------- ------- ------- ------- ------- ------- ------- 36 74 18 ------- ------- ------- ------- ------- ------- ------- ------- 39 70 ------- b ------- 2 ------- 1 ------- ------- ------- 42 64 12 ------- 3 ------- ------- ------- ------- ------- ------- 45 61 ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 53 ------- ------- ------- ------- ------- ------- ------- ------- ------- 51 48 11 5 ------- ------- 1 ------- ------- ------- ------- 54 44 ------- ------- 2 ------- ------- ------- ------- ------- ------- 57 41 10 4 ------- ------- ------- ------- ------- ------- ------- 60 35 8 3 ------- ------- ------- ------- ------- ------- ------- 63 34 ------- ------- ------- ------- ------- ------- ------- ------- ------- 66 ------- 7 2 ------- 1 ------- ------- ------- ------- ------- 69 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 28 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 26 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 ------- ------- ------- 1 ------- ------- ------- ------- ------- ------- 84 23 5 ------- ------- ------- ------- ------- ------- ------- ------- 87 ------- 4 ------- ------- ------- ------- ------- ------- ------- ------- 90 21 ------- 1 ------- ------- ------- ------- ------- ------- ------- 93 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 ------- ------- ------- ------- ------- ------- ------- ------- 99 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 16 3 ------- ------- ------- ------- ------- ------- ------- ------- 108 14 2 ------- ------- ------- ------- ------- ------- ------- ------- ill13 1 ------- ------- ------- ------- ------- ------- ------- ------- 114 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 12 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- ------- ------- ------- ------- ------- ------- ------- 162 ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 ------- ------- ------- ------- ------- ------- ------- ------- 171 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 3 0 0 0 0 0 0 0 0 0 Tab1e"'� Event-Stage-Duration Analysis Curceof T,andv� NDM filename: d:\wetbank\wetbank.wdm Data Set number: 591 ..Elevation GREATER than or equal Critical Total Hours Analysed: bb240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 Critical Depths 6.GGG 7.GGG 8_000 q_QQQ 1Q_000 tt_444 t2 Q44 t� 1 L� SCkI t6 %t >= Critical 3.148 1.156 0.476 0.146 0.026 0.000 0.000 0.000 0.000 0.000 t >= Critical 2085 766 315 97 17 0 0 0 0 0 Total Events 116 73 36 11 1 0 0 0 0 0 Duration(hr) Events 3 116 69 28 10 ------- ------- ------- ------- ------- ------- 6 108 57 24 8 ------- ------- ------- ------- ------- ------- 9 91 36 13 5 ------- ------- ------- ------- ------- ------- 12 77 21 10 2 ------- ------- ------- ------- ------- ------- 15 53 16 6 ------- 1 ------- ------- ------- ------- ------- 18 39 12 4 ------- ------- ------- ------- ------- ------- ------- 21 28 1 ------- ------- ------- ------- ------- ------- ------- ------- 24 25 4 3 1 ------- ------- ------- ------- ------- ------- 27 21 3 1 ------- ------- ------- ------- ------- ------- ------- 30 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 33 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 36 9 2 ------- ------- ------- ------- ------- ------- ------- ------- 39 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 45 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 48 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 51 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 54 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 57 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 60 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 63 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 66 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- 81 1 ------- ------- ------- ------- ------- ------- ------- ------- ------- 84 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 87 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 90 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 114 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 ------- ------ ------- ------- ------- ------- ------- ------- 144 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- ------- ------- ------- ------- ------- ------- ------- 162 ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- ------- ------- ------- ------- ------- ------- ------- ------- 180 ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 0 0 0 0 0 Q Q Q Q Q Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 18.997 8.649 4.814 2.732 1.306 0.581 0.253 0.123 0.043 0.005 t >= Critical 49956 22744 12658 7184 3435 1528 666 323 112 14 Total Events 1491 1486 1086 693 352 173 92 48 19 2 Duration(hr) Events 3 1482 1405 969 608 298 146 66 32 15 ------- 6 1400 1177 711 437 205 91 41 17 6 2 9 1271 865 495 282 139 62 26 14 5 ------- 12 1093 616 348 198 99 42 15 10 4 ------- 15 922 464 253 137 68 27 13 8 1 ------- 18 781 365 192 96 50 22 10 3 ------- ------- 21 681 303 155 76 35 17 7 ------- ------- ------- 24 599 246 123 59 26 12 4 ------- ------- ------- 27 536 204 96 49 23 9 ------- ------- ------- ------- 30 483 181 79 44 19 5 ------- ------- ------- ------- 33 434 153 65 36 16 ------- ------- ------- ------- ------- 36 399 128 54 26 12 4 ------- ------- ------- 39 362 103 48 25 6 ------- -—---- 1 ------- ------- 42 334 93 41 22 5 ------- 1 ------- ------- ------- 45 308 81 32 16 4 ------- ------- ------- ------- ------- 48 282 72 27 11 ------- 2 ------- ------- ------- ------- 51 264 67 ------- 9 3 ------- ------- ------- ------- ------- 54 251 62 23 7 ------- ------- ------- ------- ------- ------- 57 236 54 21 ------- 2 ------- ------- ------- ------- ------- 60 221 46 16 5 ------- ------- ------- ------- ------- ------- 63 207 43 13 ------- ------- ------- ------- ------- ------- ------- 66 194 41 8 4 ------- ------- ------- ------- ------- ------- 69 184 39 6 2 ------- ------- ------- ------- ------- ------- 72 175 37 5 1 ------- ------- ------- ------- ------- ------- 75 166 30 ------- ------- ------- ------- ------- ------- ------- ------- 78 153 27 4 ------- ------- ------- ------- ------- ------- ------- 81 147 22 ------- ------- ------- ------- ------- ------- ------- ------- 84 139 18 3 ------- ------- ------- ------- ------- ------- ------- 87 134 14 ------- ------- ------- ------- ------- ------- ------- ------- 90 123 11 ------- ------- ------- ------- ------- ------- ------- ------- 93 116 10 ------- ------- ------- ------- ------- ------- ------- ------- 96 ill 9 ------- ------- ------- ------- ------- ------- ------- ------- 99 98 8 ------- ------- ------- ------- ------- ------- ------- ------- 102 93 7 ------- ------- ------- ------- ------- ------- ------- ------- 105 90 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 86 6 ------- ------- ------- ------- ------- ------- ------- ------- ill77 5 ------- ------- ------- ------- ------- ------- ------- ------- 114 73 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 69 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 67 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 65 4 ------- ------- ------- ------- ------- ------- ------- ------- 129 61 3 ------- ------- ------- ------- ------- ------- ------- ------- 132 60 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 58 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 53 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 51 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 47 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 43 ------- ------- ------- ------- ------- ------- ------- ------- ------- 153 41 ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 37 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 29 ------ ------ ------- ------- ------- ------- ------- ------- ------- 174 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 26 2 ------- ------- ------- ------- ------- ------- ------- ------- 180 25 ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 186 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 19 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank WDM filename: d:\uetbank\uetbank.udm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 30.821 14.899 8.690 5.270 2.662 1.205 0.492 0.225 0.074 0.011 t >= Critical 20416 9869 5756 3491 1763 798 326 149 49 7 Total Events 600 631 471 317 180 95 52 26 9 1 Duration(hr) Events 3 598 596 426 286 150 80 37 19 7 ------- 6 569 508 318 212 107 53 19 ------- 3 1 9 527 385 225 138 76 32 10 7 2 ------- 12 454 271 157 104 50 21 7 5 1 ------- 15 391 199 126 72 32 13 6 3 ------- ------- 18 338 161 90 49 24 11 4 1 ------- ------- 21 291 131 72 37 18 7 3 ------- ------- ------- 24 257 107 55 26 14 5 2 ------- ------- ------- 27 222 93 42 24 13 4 ------- ------- ------- ------- 30 201 85 34 22 10 ------- ------- ------- ------- ------- 33 178 69 29 19 9 ------- ------- ------- ------- ------- 36 174 57 26 ------- 8 2 ------- ------- ------- ------- 39 158 46 24 15 ------- ------- ------- ------- ------- ------- 42 149 40 20 12 3 ------- ------- ------- ------- ------- 45 137 35 16 7 2 ------- ------- ------- ------- ------- 48 125 30 14 ------- ------- ------- ------- ------- ------- ------- 51 114 28 ------- 5 1 ------- ------- ------- ------- ------- 54 106 25 ------- 4 ------- ------- ------- ------- ------- ------- 57 101 22 10 ------- ------- ------- ------- ------- ------- ------- 60 94 ------- 9 2 ------- ------- ------- ------- ------- ------- 63 86 20 6 ------- ------- ------- ------- ------- ------- ------- 66 79 19 4 1 ------- ------- ------- ------- ------- ------- 69 75 18 2 ------- ------- ------- ------- ------- ------- ------- 72 71 17 ------- ------- ------- ------- ------- ------- ------- ------- 75 69 14 ------- ------- ------- ------- ------- ------- ------- ------- 78 66 12 ------- ------- ------- ------- ------- ------- ------- ------- 81 62 9 ------- ------- ------- ------- ------- ------- ------- ------- 84 55 8 ------- ------- ------- ------- ------- ------- ------- ------- 87 54 6 ------- ------- ------- ------- ------- ------- ------- ------- 90 50 3 ------- ------- ------- ------- ------- ------- ------- ------- 93 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 43 ------- ------- ------- ------- ------- ------- ------- ------- 99 38 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 32 2 ------- ------- ------- ------- ------- ------- ------- ------- ill28 ------- ------- ------- ------- ------- ------- ------- ------- ------- 114 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 18 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 14 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 165 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 12 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 9 1 ------- ------- ------- ------- ------- ------- ------- ------- 189 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 192 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 5 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 14.444 5.670 2.791 1.327 0.480 0.214 0.131 0.092 0.035 0.000 t >= Critical 9568 3756 1849 879 318 142 87 61 23 0 Total Events 358 289 186 109 33 14 5 3 3 0 Duration(hr) Events 3 355 273 170 91 27 12 5 ------- 2 ------- 6 328 212 121 53 18 5 4 ------- ------- ------- 9 289 147 68 31 11 ------- ------- ------- ------- ------- 12 247 106 47 20 9 4 ------- ------- ------- ------- 15 202 73 30 12 6 ------- ------- ------- 1 ------- 18 165 52 24 7 3 ------- ------- 2 ------- ------- 21 143 44 20 5 ------- ------- ------- ------- ------- ------- 24 121 35 13 4 ------- ------- 2 ------- ------- ------- 27 109 28 9 ------- ------- ------- ------- ------- ------- ------- 30 96 25 7 ------- ------- 2 ------- ------- ------- ------- 33 83 21 5 ------- ------- ------- ------- ------- ------- ------- 36 74 16 ------- ------- ------- ------- ------- ------- ------- ------- 39 67 ------- ------- ------- 2 ------- ------- 1 ------- ------- 42 63 11 ------- ------- ------- ------- 1 ------- ------- ------- 45 55 ------- 4 3 ------- ------- ------- ------- ------- ------- 48 48 ------- ------- 2 ------- 1 ------- ------- ------- ------- 51 45 ------- ------- ------- ------- ------- ------- ------- ------- ------- 54 43 10 3 ------- ------- ------- ------- ------- ------- ------- 57 39 8 ------- ------- 1 ------- ------- ------- ------- ------- 60 35 7 ------- ------- ------- ------- ------- ------- ------- ------- 63 34 ------- 2 ------- ------- ------- ------- ------- ------- ------- 66 31 ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 26 ------- ------- 1 ------- ------- ------- ------- ------- ------- 75 24 6 ------- ------- ------- ------- ------- ------- ------- ------- 78 21 5 ------- ------- ------- ------- ------- ------- ------- ------- 81 ------- 4 ------- ------- ------- ------- ------- ------- ------- ------- 84 20 ------- 1 ------- ------- ------- ------- ------- ------- ------- 87 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 93 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 96 16 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 12 1 ------- ------- ------- ------- ------- ------- ------- ------- 105 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 2 0 0 0 0 0 0 0 0 0 Table 4 Event-Stage-Duration Analysis Future Land-use Without Mitigation Bank WDM fiLename: d:\wetbank\wetbank.wdm Data Set number: 391 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 4.185 1.801 0.974 0.548 0.261 0.116 0.024 0.009 0.000 0.000 t >= Critical 2772 1193 645 363 173 77 16 6 0 0 TotaL Events 152 112 81 50 26 15 6 2 0 0 Duration(hr) Events 3 147 104 68 41 19 11 ------- 1 ------- ------- 6 134 85 45 27 12 ------- ------- ------- ------- ------- 9 122 54 27 16 6 3 1 ------- ------- ------- 12 95 33 18 8 5 ------- ------- ------- ------- ------- 15 72 24 9 5 3 ------- ------- ------- ------- ------- 18 50 20 6 3 ------- 1 ------- ------- ------- ------- 21 40 16 4 ------- 1 ------- ------- ------- ------- ------- 24 31 9 ------- 1 ------- ------- ------- ------- ------- ------- 27 26 5 3 ------- ------- ------- ------- ------- ------- ------- 30 23 4 2 ------- ------- ------- ------- ------- ------- ------- 33 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 36 14 ------- ------- ------- ------- ------- ------- ------- ------- ------- 39 11 2 ------- ------- ------- ------- ------- ------- ------- ------- 45 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 54 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 75 5 ------- ------- ------- ------- ------- ------- ------- ------- ------- 84 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 87 2 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 0 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank NDM filename: d:\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 262968 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 18.979 8.845 4.875 2.698 1.269 0.564 0.243 0.110 0.034 0.005 t >= Critical 49908 23260 12821 7095 3338 1482 638 289 90 12 Total Events 1485 1483 1033 600 291 138 65 31 13 2 Duration(hr) Events 3 1480 1423 949 568 271 121 58 24 12 ------- 6 1412 1211 723 432 205 93 43 16 ------- 2 9 1273 899 507 293 140 63 28 13 5 ------- 12 1094 640 358 204 99 46 18 11 3 ------- 15 917 474 263 145 68 29 15 8 1 ------- 18 777 375 198 105 51 24 13 5 ------- ------- 21 678 309 163 81 38 18 8 2 ------- ------- 24 599 252 133 62 31 17 4 ------- ------- ------- 27 533 208 102 53 26 11 ------- ------- ------- ------- 30 482 187 85 46 21 7 ------- ------- ------- ------- 33 437 155 69 40 18 5 ------- ------- ------- ------- 36 399 131 56 ------- 16 4 ------- ------- ------- ------- 39 364 108 48 28 8 ------- ------- 1 ------- ------- 42 341 95 41 23 5 ------- 1 ------- ------- ------- 45 308 84 32 17 ------- ------- ------- ------- ------- ------- 48 286 73 28 11 4 2 ------- ------- ------- ------- 51 265 66 ------- 9 3 1 ------- ------- ------- ------- 54 249 62 23 7 ------- ------- ------- ------- ------- ------- 57 236 55 21 ------- 2 ------- ------- ------- ------- ------- 60 222 46 16 5 1 ------- ------- ------- ------- ------- 63 209 43 15 ------- ------- ------- ------- ------- ------- ------- 66 196 40 10 4 ------- ------- ------- ------- ------- ------- 69 182 39 6 3 ------- ------- ------- ------- ------- ------- 72 174 36 5 2 ------- ------- ------- ------- ------- ------- 75 163 30 ------- 1 ------- ------- ------- ------- ------- ------- 78 153 28 4 ------- ------- ------- ------- ------- ------- ------- 81 147 23 ------- ------- ------- ------- ------- ------- ------- ------- 84 141 20 3 ------- ------- ------- ------- ------- ------- ------- 87 131 15 ------- ------- ------- ------- ------- ------- ------- ------- 90 125 13 ------- ------- ------- ------- ------- ------- ------- ------- 93 116 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 107 11 ------- ------- ------- ------- ------- ------- ------- ------- 99 101 10 ------- ------- ------- ------- ------- ------- ------- ------- 102 93 8 ------- ------- ------- ------- ------- ------- ------- ------- 105 91 7 ------- ------- ------- ------- ------- ------- ------- ------- 108 88 6 ------- ------- ------- ------- ------- ------- ------- ------- ill79 5 ------- ------- ------- ------- ------- ------- ------- ------- 114 76 ------- ------- ------- ------- ------- ------- ------- ------ 117 70 ------- ------- ------- ------- ------- ------- ------- ------- ------- 120 68 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 67 ------- ------- ------- ------- ------- ------- ------- ------ 126 65 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 62 4 ------- ------- ------- ------- ------- ------- ------- ------- 132 60 3 ------- ------- ------- ------- ------- ------- ------- ------- 135 57 ------- ------- ------- ------- ------- ------- ------ ------- ------- 138 54 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 53 ------- ------- ------- ------- ------- ------- ------- ------- ------- 144 51 ------- ------- ------- ------- ------- ------- ------- ------- ------- 147 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 45 ------- ------- ------- ------- ------- ------- ------ ------- ------- 153 42 ------- ------- ------- ------- ------- ------- ------- ------- ------- 156 37 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 36 ------- 1 ------- ------- ------- ------- ------- ------- ------- 162 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 165 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 168 31 ------- ------- ------- ------- ------- ------- ------- ------ 171 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 25 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- 2 ------- ------- ------- ------- ------- ------- ------- ------- 180 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 183 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 186 22 ------- ------- ------- ------- ------- ------- ------ ------- ------- 189 21 ------- ------- ------- ------- ------- ------- ------- ------ 195 20 ------- ------- ------- ------- ------- ------- ------ ------- ------- 198 17 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months:10 to 12 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 30.803 15.219 8.827 5.232 2.600 1.164 0.473 0.192 0.059 0.009 t >= Critical 20404 10081 5847 3466 1722 771 313 127 39 6 Total Events 599 629 447 284 151 76 36 17 6 1 Duration(hr) Events 3 598 603 421 269 140 66 32 11 6 ------- 6 570 520 324 204 108 52 22 7 ------- 1 9 525 398 232 141 76 33 12 ------- 2 ------- 12 453 284 163 107 53 24 9 6 1 ------- 15 391 203 128 73 32 14 7 4 ------- ------- 18 336 165 94 54 24 12 6 2 ------- ------- 21 292 134 75 41 18 9 3 1 ------- ------- 24 258 112 59 28 15 8 2 ------- ------- ------- 27 222 96 43 25 13 5 ------- ------- ------- ------- 30 201 88 36 23 12 4 ------- ------- ------- ------- 33 182 71 30 22 10 3 ------- ------- ------- ------- 36 173 58 27 ------- 9 2 ------- ------- ------- ------- 39 159 48 24 16 5 ------- ------- ------- ------- ------- 42 151 40 20 12 3 ------- ------- ------- ------- ------- 45 138 36 16 8 ------- ------- ------- ------- ------- ------- 48 127 31 14 ------- 2 ------- ------- ------- ------- ------- 51 114 28 ------- 5 1 ------- ------- ------- ------- ------- 54 106 25 ------- 4 ------- ------- ------- ------- ------- ------- 57 100 23 10 ------- ------- ------- ------- ------- ------- ------- 60 93 ------- 9 2 ------- ------- ------- ------- ------- ------- 63 85 20 8 ------- ------- ------- ------- ------- ------- ------- 66 78 19 4 ------- ------- ------- ------- ------- ------- ------- 69 74 18 2 ------- ------- ------- ------- ------- ------- ------- 72 69 16 ------- ------- ------- ------- ------- ------- ------- ------- 75 66 14 ------- 1 ------- ------- ------- ------- ------- ------- 78 63 12 ------- ------- ------- ------- ------- ------- ------- ------- 81 61 ------- ------- ------- ------- ------- ------- ------- ------- ------- 84 56 9 ------- ------- ------- ------- ------- ------- ------- ------- 87 53 6 ------- ------- ------- ------- ------- ------- ------- ------- 90 50 4 ------- ------- ------- ------- ------- ------- ------- ------- 93 46 ------- ------- ------- ------- ------- ------- ------- ------- ------- 96 40 ------- ------- ------- ------- ------- ------- ------- ------- ------- 99 39 ------- ------- ------- ------- ------- ------- ------- ------- ------- 102 35 ------- ------- ------- ------- ------- ------- ------- ------- ------- 105 33 ------- ------- ------- ------- ------- ------- ------- ------- ------- 108 32 2 ------- ------- ------- ------- ------- ------- ------- ------- ill29 ------- ------- ------- ------- ------- ------- ------- ------- ------- 114 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 117 25 ------- ------- ------- ------ ------- ------- ------- ------- ------- 120 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 123 23 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 22 ------- ------- ------- ------- ------- ------- ------- ------- ------- 129 20 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 19 ------- ------- ------- ------- ------- ------- ------- ------- ------- 135 17 ------- ------- ------- ------- ------- ------- ------- ------- ------- 150 15 ------- ------- ------- ------- ------- ------- ------- ------- ------- 159 ------- ------- 1 ------- ------- ------- ------- ------- ------- ------- 168 13 ------- ------- ------- ------- ------- ------- ------- ------- ------- 171 11 ------- ------- ------- ------- ------- ------- ------- ------- ------- 174 10 ------- ------- ------- ------- ------- ------- ------- ------- ------- 177 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 180 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 189 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 195 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 4 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 3 to 5 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 14.417 5.821 2.820 1.292 0.459 0.207 0.130 0.091 0.030 0.000 t >= Critical 9550 3856 1868 856 304 137 86 60 20 0 Total Events 354 283 181 89 23 11 5 2 2 0 Duration(hr) Events 3 349 273 167 83 22 9 5 ------- 2 ------- 6 329 222 122 56 18 6 4 ------- ------- ------- 9 291 155 70 32 11 ------- ------- ------- ------- ------- 12 246 108 46 22 7 4 ------- ------- ------- ------- 15 200 73 32 15 5 ------- ------- ------- 1 ------- 18 167 52 24 10 ------- ------- ------- 2 ------- ------- 21 139 43 21 6 ------- ------- ------- ------- ------- ------- 24 121 34 14 ------- ------- ------- 2 ------- ------- ------- 27 106 27 10 4 ------- ------- ------- ------- ------- ------- 30 95 25 7 ------- ------- 2 ------- ------- ------- ------- 33 84 21 5 ------- ------- ------- ------- ------- ------- ------- 36 74 17 ------- ------- 3 ------- ------- ------- ------- ------- 39 67 ------- ------- ------- 2 ------- ------- 1 ------- ------- 42 64 12 ------- ------- ------- ------- 1 ------- ------- ------- 45 54 11 ------- 3 ------- ------- ------- ------- ------- ------- 48 50 ------- 4 2 ------- ------- ------- ------- ------- ------- 51 45 ------- ------- ------- ------- 1 ------- ------- ------- ------- 54 41 10 3 ------- ------- ------- ------- ------- ------- ------- 57 39 9 ------- ------- ------- ------- ------- ------- ------- ------- 60 35 7 ------- ------- 1 ------- ------- ------- ------- ------- 63 34 ------- 2 ------- ------- ------- ------- ------- ------- ------- 66 32 ------- ------- ------- ------- ------- ------- ------- ------- ------- 69 27 ------- ------- ------- ------- ------- ------- ------- ------- ------- 72 25 ------- ------- 1 ------- ------- ------- ------- ------- ------- 75 24 ------- ------- ------- ------- ------- ------- ------- ------- ------- 78 21 6 ------- ------- ------- ------- ------- ------- ------- ------- 81 ------- 5 ------- ------- ------- ------- ------- ------- ------- ------- 84 20 ------- 1 ------- ------- ------- ------- ------- ------- ------- 87 17 ------- ------- ------- ------- ------- ------- ------- ------- 96 16 3 ------- ------- ------- ------- ------- ------- ------- ------- 99 12 2 ------- ------- ------- ------- ------- ------- ------- ------- 105 ------- 1 ------- ------- ------- ------- ------- ------- ------- ------- 108 11 ------- ------- ------- ------- ------- ------- ------- ------- 123 9 ------- ------- ------- ------- ------- ------- ------- ------- ------- 126 8 ------- ------- ------- ------- ------- ------- ------- ------- ------- 132 7 ------- ------- ------- ------- ------- ------- ------- ------- ------- 138 6 ------- ------- ------- ------- ------- ------- ------- ------- ------- 141 5 ------- ------- ------- ------- ------- ------- ------- ------- 147 4 ------- ------- ------- ------- ------- ------- ------- ------- ------- 186 3 ------- ------- ------- ------- ------- ------- ------- ------- ------- 198 2 0 0 0 0 0 0 0 0 0 Table 5 Event-Stage-Duration Analysis Future Land-use With Mitigation Bank WDM filename: d:\wetbank\wetbank.wdm Data Set number: 691 ..Elevation GREATER than or equal Critical Total Hours Analysed: 66240 Period of Analysis :10/ 1/1961 - 9/30/1991 using months: 7 to 9 Critical Depths 6.000 7.000 8.000 9.000 10.000 11.000 12.000 13.000 14.500 16.000 %t >= Critical 4.173 1.869 1.004 0.530 0.243 0.104 0.017 0.008 0.000 0.000 t >= Critical 2764 1238 665 351 161 69 11 5 0 0 Total Events 151 113 75 39 20 11 2 1 0 0 Duration(hr) Events 3 149 108 68 36 18 10 ------- 1 ------- ------- 6 138 90 49 26 13 4 ------- ------- ------- ------- 9 122 58 29 18 6 2 1 ------- ------- ------- 12 96 35 19 11 5 ------- ------- ------- ------- ------- 15 70 25 12 6 3 ------- ------- ------- ------- ------- 18 51 20 7 4 ------- 1 ------- ------- ------- ------- 21 40 16 4 ------- ------- ------- ------- 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Prob. ) HSPF Simulations ■ User Defined Positions Springbrook Creek at 5% and 95% Confidence Limits SW 34th Street r FREQUENCY STATISTICS Future LU W/Bank LOG TRANSFORM OF FLOW, CFS NUMBER OF EVENTS MEAN 2.7330 HISTORIC EVENTS D WATER YEARS IN RECORD STANDARD DEV .1239 HIGH OUTLIERS o 1 9 6 2—1 9 9 1 SKEW .3206 LOW OUTLIERS 0 REGIONAL MAP SKEW -- ZERO OR MISSING 0 ADOPTED SKEW .3000 SYSTEMATIC EVENTS 30 10000 + Without Mitigation Bank x _____ With Mitigation Bank 1000 C_ - O � l a 100 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) East Side Green River — Wetland Mitigation Bank 2 Analyses Current Land—use Simulated Peak Flows in Mill Creek at SW 34th Street 10000 + Without Mitigation Bank With Mitigation Bank -63 v 1000 C_ + -' 90 0 CD a � 100 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) East Side Green River - Wetland Mitigation Bank 2 Analyses Future Land-use Simulated Peak Flows in Mill Creek at SW 34th Street 20 + Without Mitigation Bank With Mitigation Bank , 15 o � CD --- + + z + (D 4-J 10 0- 5 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) East Side Green River - Wetland Mitigation Bank 2 Analyses Current Land-use Simulated Peak Stages in Mill Creek at SW 34th Street 20 + Without Mitigation Bank With Mitigation Bank , -I# CD # # CD ,- 10cn a 5 .001 .01 . 10 .50 .90 .99 .999 Cumulative Probability (P) East Side Green River - Wetland Mitigation Bank 2 Analyses Future Land-use Simulated Peak Stages in Mill Creek at SW 34th Street Appendix A HSPF User Control Input Files Date: 03/22/95 File name: SBRK CUR.INP Page 1 Date: 03/22/95 File name: SBRK CUR.INP Page 2 RUN 5 5 0.1 4.7 .5 GLOBAL 6 6 0.1 .5 `•` HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 7 7 0.1 4.2 .5 Input sequence (UCI) for current land-use conditions END HYDR-PARM2 Without Wetland Mitigation Bank Site 2 SPRINGBROOK CREEK - Current Conditions - HSPF Model for Long Runs HYDR-INIT START 1961/10/01 00:00 END 1991/09/30 24:00 RCHRES Initial conditions for HYDR `•` RUN INTERP OUTPUT LEVEL 0 # - # VOL Initial value of COLIND *" Initial value of OUTDGT RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 (ac-ft) for each possible exit ++' for each possible exit END GLOBAL EX1 EX2 EX3 EX4 EX5 ++' EX1 EX2 EX3 EX4 EX5 OPN SEQUENCE 1 15 0.1 INGRP INDELT 1:00 END HYDR-INIT RCHRES 5 END RCHRES RCHRES 6 RCHRES 7 FTABLES END INGRP END OPN SEQUENCE FTABLE 6 FILES ROWS COLS +•` <FILE> <UN#>'•'<----FILE NAME-------------------------------------------------> 15 4 WDM 21 d:\wetbank\wetbank.wdm DEPTH AREA VOLUME OUTFLOW ••• MESSU 22 sbrk_cur.OUT (FT) (ACRES) (AC-FT) (CFS) +" INFO 23 c:\hspfl0\HSPINF.DA 0.00 0.00 0.00 0.00 ERROR 24 c:\hspfl0\HSPERR.DA 0.45 0.01 0.02 0.60 WARN 25 c:\hspfl0\HSPWRN.DA 0.90 0.01 0.08 3.60 END FILES 1.35 0.01 0.15 9.00 1.80 0.01 0.23 15.60 2.25 0.01 0.30 24.00 RCHRES 2.70 0.01 0.37 33.00 ACTIVITY 3.15 0.01 0.45 42.00 RCHRES Active Sections (1=Active; O=Inactive) +*+ 3.60 0.01 0.52 51.60 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ++* 4.05 0.01 0.58 57.00 1 162 1 4.50 0.01 0.60 60.00 END ACTIVITY 5.00 0.10 0.63 61.00 6.00 2.00 1.68 62.00 PRINT-INFO 10.00 4.00 13.68 66.00 Print-flags ... 12.00 20.00 37.68 70.00 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PH PIVL PYR *`* END FTABLE 6 1 162 6 9 END PRINT-INFO FTABLE 7 GEN-INFO •*` STCORR 4.20 RCHRES<-------Name------->Nexit Unit Systems Printer `+• +*' HEC2 - Springbrook Creek at SW34th Street # - # User t-series Engl Metr LKFG `+` ROWS COLS ••+ in out *`• 13 4 5 Sub-Basin S5 1 1 1 1 0 0 0 DEPTH AREA VOLUME OUTFLOWI 6 Sub-Basin S6 1 1 1 1 0 0 0 (FT) (ACRES) (AC-FT) (CPS) '*+ 7 Sub-Basin S7 1 1 1 1 0 0 0 0.0 0.00 0.00 0.0 END GEN-INFO 1.6 1.37 1.69 20.0 2.1 1.42 2.42 40.0 HYDR-PARM1 2.5 1.47 3.01 60.0 RCHRES Flags for HYDR section *`+ 2.9 1.50 3.55 80.0 I - # VC Al A2 A3 ODFVFG for each ODGTFG for each +•* FUNCT for each 4.3 1.82 5.86 159.0 FG FG FG FG possible exit possible exit *+* possible exit 6.7 2.38 10.88 318.0 1 2 3 1 2 3 4 5 1 2 3 4 5 ••+ 8.6 2.84 15.76 477.0 10.4 3.26 21.16 636.0 5 0 1 0 0 4 11.4 4.75 24.75 795.0 6 0 0 0 0 4 13.3 72.22 88.48 1193.0 7 0 1 0 0 4 13.9 117.12 156.97 1590.0 END HYDR-PARM1 13.9 117.74 166.84 1749.0 END FTABLE 7 HYDR-PARM2 RCHRES - FTABLE 5 # - # DSN FTBN LEN DELTH STCOR KS +++ +•• STCORR 4.70 Date: 03/22/95 File name: SBRK CUR.INP Page 3 Date: 03/22/95 File name: SBRK CUR.INP Page 4 `++ HEC2 - Springbrook Creek at Oakesdale Ave MASS-LINK 1 ROWS COLS °iy <Srce> <-Grp> <-Member-><--Mult--> <Targ> <-Grp;, <-Member-> +++ 13 4 <Name> <Name> <Name> 4 #<-factor-> <Name> <Name> <Name> 8 M a++ DEPTH AREA VOLUME OUTFLOWI +aa RCHRES ROFLOW RCHRES INFLOW (FT) (ACRES) (AC-FT) (CFS) °+• END MASS-LINK 1 0.0 0.00 0.00 0.0 1.8 0.94 1.10 18.0 END MASS-LINK 2.4 0.96 1.66 36.0 2.9 0.98 2.12 54.0 END RUN 3.3 1.01 2.53 72.0 4.7 1.28 4.19 145.0 7.2 1.77 7.91 290.0 9.4 2.35 12.30 434.0 11.6 2.95 18.04 579.0 12.9 11.48 22.92 724.0 14.1 35.57 59.22 1086.0 14.8 40.87 84.55 1448.0 15.0 42.06 93.33 1593.0 6ND FTABL6 5 END FTABLES EXT SOURCES <Volume-> [Member). 5'YsSgap<,-Mult-_>Tran <-Target v01s7 <-Grp> t-Member-7 +++ (Name). k tName> # Gem sttgvfactor->Sirg <Name2 4 {{ /Name> p !) a++ E9TERNAL REACHES ++. SPRING8p00K CREED TO REACT♦ 5 AND F64 S-4 y1DN 204 FLOW ENGL 0.082645 RCHR55 5 EXTNL fVOL �„^ MILL CF6EK TO REACH 5 AND FEQ M-19 wof 219 FLOW ENGL 0.082645 RCHRES 5 EXTNL fVOL ,.a UPPER S?RINGBROOt WETLAND OVERFLOW TO REACH 6 wvo 232 FLOW ENGL 01082645 RCHRES 6 EXTNL fVOL ' BASINS St)OBASIN _e S5 W WOO W 195 yURO ERO ENGL 1•S657 RCHRES 5 EXTNL fVOL SNOBASIN +r' S6 W"o 140 QERO ENGL 1.2500 RCHe65 6 EXTNL fVOL W 144 QERO ONGL 8.6710 RCHRES 6 EXTNL %VOL ZW 145 ORO ENGL 16.1873 RCHR5y 6 EXTNL fVOL B e S7 S �I14SaPROa ENGL 1.2895 R HRdy 7 EXTNL fVOL ENO EXT S,jj1CPS TARG � Jolumee).SG-Gcp> <-f)ember,><i"lilt„).?yan <,yoljme-> <M®Aer> T., T9ap Pfd + ° <�gme). A <NOme> p 8<ifact,r . (,rg <Name9 # <N8Jae> t1m strg g40rga++ RG�RES 5 r, DR RO WOM Zo9 FLOC ENG6 PLO LR p'p RG�RES 7 t)YDR RO WpM 29p PLO ENGL AIR`,,W RG0RES EXT 7 BEDS STAGE WDM 29I STAG ENGL AGGR A D Eo TAF S60EMATIC +++ <•�ource Fe,> <�_pa--> <,Tat�et-> <P�� > ++ <rfgE> k <_fp R `tOc,). <MamaF A RG�RES S RCHR6, 7 1 + R60 SC 6 C RCHR6y 7 1 Er�0 HEMA'fS �ys,LINK Date: 03/22/95 File name: SBRK FUT.INP Page 1 Date: 03/22/95 File name: SBRK FUT.INP Page 2 RUN 6 6 0.1 .5 GLOBAL 7 7 0.1 4.2 .5 '++ HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 END HYDR-PARM2 +++ Input sequence (UCI) for future land-use conditions Without Mitigation Bank Site 2 HYDR-SNIT SPRINGBROOK CREEK - Future Conditions - HSPF Model for Long Runs RCHRES Initial conditions for HYDR ... START 1961/10/01 00:00 END 1991/09/30 24:00 # - # VOL Initial value of COLIND +.. Initial value of OUTDGT RUN INTERP OUTPUT LEVEL 0 (ac-ft) for each possible exit "' for each possible exit RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 EX1 EX2 EX3 EX4 EX5 - EX1 EX2 EX3 EX4 EX5 END GLOBAL 1 15 0.1 OPN SEQUENCE END HYDR-INIT INGRP INDELT 1:00 END RCHRES RCHRES 5 RCHRES 6 FTABLES RCHRES 7 END INGRP END OPN SEQUENCE FTABLE 6 ROWS COLS ++' FILES 15 4 <FILE> <UN#>`"<----FILE NAME-------------------------------------------------> DEPTH AREA VOLUME OUTFLOW +'+ WDM 21 d:\wetbank\wetbank.wdm (FT) (ACRES) (AC-FT) (CFS) MESSU 22 sbrk_FUT.OUT 0.00 0.00 0.00 0.00 INFO 23 c:\hspfl0\HSPINF.DA 0.45 0.01 0.02 0.60 ERROR 24 c:\hspfl0\HSPERR.DA 0.90 0.01 0.08 3.60 WARN 25 c:\hspfl0\HSPWRN.DA 1.35 0.01 0.15 9.00 END FILES 1.80 0.01 0.23 15.60 2.25 0.01 0.30 24.00 RCHRES 2.70 0.01 0.37 33.00 ACTIVITY 3.15 0.01 0.45 42.00 RCHRES Active Sections (1=Active; O=Inactive) `*+ 3.60 0.01 0.52 51.60 # - # HYFG ADFG CNFG HTFG SDFG GQ£G OXFG NUFG PKFG PHFG +" 4.05 0.01 0.58 57.00 1 162 1 4.50 0.01 0.60 60.00 END ACTIVITY 5.00 0.10 0.63 61.00 6.00 2.00 1.68 62.00 PRINT-INFO 10.00 4.00 13.68 66.00 Print-flags `+` 12.00 20.00 37.68 70.00 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PINK PH PIVL PYR `++ END FTABLE 6 1 162 6 9 FTABLE 7 END PRINT-INFO +" STCORR 4.20 '•+ HEC2 - Springbrook Creek at SW34th Street GEN-INFO ROWS COLS +`+ RCHRES<-------Name------->Nexit Unit Systems Printer '•+ 13 4 # - # User t-series Engl Metr LKFG +++ DEPTH AREA VOLUME OUTFLOWI in out "+ (FT) (ACRES) (AC-FT) (CFS) 5 Sub-Basin S5 1 1 1 1 0 0 0 0.0 0.00 0.00 0.0 6 Sub-Basin S6 1 1 1 1 0 0 0 1.6 1.37 1.71 21.0 7 Sub-Basin S7 1 1 1 1 0 0 0 2.1 1.42 2.45 41.0 END GEN-INFO 2.5 1.47 3.03 62.0 2.8 1.50 3.55 82.0 HYDR-PARM1 4.2 1.82 5.83 164.0 RCHRES Flags for HYDR section `.. 6.7 2.37 10.80 328.0 # - # VC Al A2 A3 ODFVFG for each ODGTFG for each `+' FUNCT for each 8.6 2.84 15.76 493.0 FG FG FG FG possible exit possible exit +++ possible exit 10.4 3.27 21.26 657.0 1 2 3 1 2 3 4 5 1 2 3 4 5 +++ 11.4 5.38 24.98 821.0 13.1 68.64 79.11 1232.0 5 0 1 0 0 4 13.9 117.17 158.50 1642.0 6 0 0 0 0 4 13.9 117.75 168.00 1806.0 7 0 1 0 0 4 END FTABLE 7 END HYDR-PARM1 FTABLE 5 HYDR-PARM2 "` STCORR 4.70 RCHRES "' +++ HEC2 - Springbrook Creek at Oakesdale Ave # - # DSN FTBN LEN DELTH STCOR KS +++ ROWS COLS •+` 5 5 0.1 4.7 .5 13 4 Date: 03/22/95 File name: SBRK FUT.INP Page 3 Date: 03/22/95 File name: SBRK FUT.INP Page 4 DEPTH AREA VOLUME OUTFLOWI +*+ END MASS-LINK 1 (FT) (ACRES) (AC-FT) (CPS) `** 0.0 0.00 0.00 0.0 END MASS-LINK 1.9 0.94 1.15 20.0 2.5 0.97 1.70 39.0 END RUN 2.9 0.99 2.17 59.0 3.3 1.02 2.59 78.0 4.7 1.28 4.28 156.0 7.2 1.78 8.04 312.0 9.5 2.39 12.64 469.0 11.9 3.00 18.76 625.0 13.0 16.01 24.55 781.0 14.2 36.31 61.78 1172.0 14.9 41.84 90.16 1562.0 15.1 54.33 100.30 1718.0 END FTABLE 5 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # - EXTERNAL REACHES *** `** SPRINGBROOK CREEK TO REACH 5 WDM 304 FLOW ENGL 0.082645 RCHRES 5 EXTNL IVOL `*• MILL CREEK TO REACH 5 WDM 319 FLOW ENGL 0.082645 RCHRES 5 EXTNL IVOL *** BASINS SUBBASIN *** S5 WDM 144 PERO ENGL 1.7400 RCHRES 5 EXTNL IVOL WDM 145 SURO ENGL 2.4933 RCHRES 5 EXTNL IVOL SUBBASIN *** S6 WDM 140 PERO ENGL 0.0750 RCHRES 6 EXTNL IVOL WDM 141 PERO ENGL 1.3038 RCHRES 6 EXTNL IVOL WDM 144 PERO ENGL 4.4385 RCHRES 6 EXTNL IVOL WDM 145 SURO ENGL 20.1578 RCHRES 6 EXTNL IVOL SUBBASIN *`* S7a WDM 144 PERO ENGL 2.2754 RCHRES 7 EXTNL IVOL WDM 145 SURD ENGL 5.4329 RCHRES 7 EXTNL IVOL END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 5 HYDR RO WDM 389 FLOW ENGL AGGR ADD RCHRES 6 HYDR RO WDM 306 FLOW ENGL AGGR ADD RCHRES 7 HYDR RO WDM 390 FLOW ENGL AGGR ADD RCHRES 7 HYDR STAGE WDM 391 STAG ENGL AGGR ADD END EXT TARGETS SCHEMATIC <-Source-> <--Area--> <-Target-> <ML-> ++* <Name> # <-factor-> <Name> # # RCHRES 5 RCHRES 7 1 RCHRES 6 RCHRES 7 1 END SCHEMATIC MASS-LINK MASS-LINK 1 <Srce> <-Grp> <-Member-><--Mult--> <Targ> <-Grp> <-Member-> **` <Name> <Name> <Name> # #<-factor-> <Name> <Name> <Name> # # *`* RCHRES ROFLOW RCHRES INFLOW Date: 03/22/95 File name: BANK CUR.INP Page 1 Date: 03/22/95 File name: BANK CUR.INP Page 2 RUN (ac-ft) for each possible exit +++ for each possible exit GLOBAL EX1 EX2 EX3 EX4 EX5 "` EX1 EX2 EX3 EX4 EX5 +•+ HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 1 15 0.1 +++ Input sequence (UCI) for current land-use conditions END HYDR-INIT ••+ With Wetland Mitigation Bank Site 2 END RCHRES SPRINGBROOK CREEK - Current Conditions - HSPF Model for Long Runs START 1961/10/01 00:00 END 1991/09/30 24:00 FTABLES RUN INTERP OUTPUT LEVEL 0 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 END GLOBAL FTABLE 7 OPN SEQUENCE •+• STCORR 4.20 INGRP INDELT 1:00 +++ HEC2 - Springbrook Creek at SW34th Street with Bank Volume RCHRES 7 ROWS COLS +++ END INGRP 13 4 END OPN SEQUENCE DEPTH AREA VOLUME OUTFLOWI ••• (FT) (ACRES) (AC-FT) (CFS) •++ FILES 0.0 0.00 0.00 0.0 <FILE> <UN#>++•<----FILE NAME-------------------------------------------------> 1.6 1.37 1.69 20.0 WDM 21 d:\wetbank\wetbank.wdm 2.1 1.42 2.82 40.0 MESSU 22 bank_cur.OUT 2.5 1.47 3.91 60.0 INFO 23 c:\hspfl0\HSPINF.DA 2.9 1.50 5.05 80.0 ERROR 24 c:\hspfl0\HSPERR.DA 4.3 1.82 11.56 159.0 WARN 25 c:\hspfl0\HSPWRN.DA 6.7 2.38 31.68 318.0 END FILES 8.6 2.84 56.76 477.0 10.4 3.26 83.56 636.0 11.4 4.75 100.15 795.0 RCHRES 13.3 72.22 190.08 1193.0 ACTIVITY 13.9 117.12 265.47 1590.0 RCHRES Active Sections (1=Active; O=Inactive) ++• 13.9 117.74 275.34 1749.0 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG +++ END FTABLE 7 1 162 1 END ACTIVITY END FTABLES PRINT-INFO Print-flags +++ EXT SOURCES # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PH PIVL PYR +++ <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> +++ 1 162 6 9 <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # +•• END PRINT-INFO EXTERNAL REACHES ••• •+• SPRINGBROOK CREEK TO REACH 7 GEN-INFO WDM 269 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL RCHRES<-------Name------->Nexit Unit Systems Printer +•+ •`• REACH 6 # - # User t-series Engl Metr LKFG ++` WDM 206 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL in out +++ +++ BASINS 7 Sub-Basin S7 1 1 1 1 0 0 0 SUBBASIN ••* S7a END GEN-INFO WDM 144 PERO ENGL 3.2795 RCHRES 7 EXTNL IVOL WDM 145 SURO ENGL 1.2895 RCHRES 7 EXTNL IVOL HYDR-PARM1 END EXT SOURCES RCHRES Flags for HYDR section +++ # - # VC Al A2 A3 ODFVFG for each ODGTFG for each ++• FUNCT for each FG FG FG FG possible exit possible exit ••• possible exit EXT TARGETS 1 2 3 1 2 3 4 5 1 2 3 4 5 +`• <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ••• <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg••• 7 0 1 0 0 4 RCHRES 7 HYDR RO WDM 590 FLOW ENGL AGGR ADD END HYDR-PARMl RCHRES 7 HYDR STAGE WDM 591 STAG ENGL AGGR ADD END EXT TARGETS HYDR-PARM2 `•• RCHRES •+• END RUN # - # DSN FTBN LEN DELTH STCOR KS ++* 7 7 0.1 4.2 .5 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for HYDR ••• # - # VOL Initial value of COLIND +++ Initial value of OUTDGT Date: 03/22/95 File name: BANK FUT.INP Page 1 Date: 03/22/95 File name: BANK FUT.INP Page 2 RUN EX1 EX2 EX3 EX4 EX5 '+` EX1 EX2 EX3 EX4 EX5 GLOBAL 1 15 0.1 HSPF Version 10.10 Lower Springbrook Creek NHC 2/22/1995 END HYDR-INIT '+* Input sequence (UCI) for future land-use conditions END RCHRES With Mitigation Bank Site 2 SPRINGBROOK CREEK - Future Conditions - HSPF Model for Long Runs FTABLES START 1961/10/01 00:00 END 1991/09/30 24:00 RUN INTERP OUTPUT LEVEL 0 FTABLE 7 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 ++• STCORR 4.20 END GLOBAL "• HEC2 - Springbrook Creek at SW34th Street OPN SEQUENCE ROWS COLS ++` INGRP INDELT 1:00 13 4 RCHRES 7 DEPTH AREA VOLUME OUTFLOWI "' END INGRP (FT) (ACRES) (AC-FT) (CPS) - END OPN SEQUENCE 0.0 0.00 0.00 0.0 1.6 1.37 1.71 21.0 FILES 2.1 1.42 2.85 41.0 <FILE> <UN#>'*'<----FILE NAME--------------------------------------------> 2.5 1.47 3.93 62.0 WDM 21 d:\wetbank\wetbank.wdm 2.8 1.50 4.85 82.0 MESSU 22 bank_FUT.OUT 4.2 1.82 11.13 164.0 INFO 23 c:\hspfl0\HSPINF.DA 6.7 2.37 31.60 328.0 ERROR 24 c:\hspfl0\HSPERR.DA 8.6 2.84 56.76 493.0 WARN 25 c:\hspfl0\HSPWRN.DA 10.4 3.27 83.66 657.0 END FILES 11.4 5.38 100.38 821.0 13.1 68.64 177.91 1232.0 RCHRES 13.9 117.17 267.00 1642.0 ACTIVITY 13.9 117.75 276.50 1806.0 RCHRES Active Sections (1=Active; 0=Inactive) '+• END FTABLE 7 # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG "' END FTABLES 1 162 1 END ACTIVITY EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> '+• PRINT-INFO <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # "' Print-flags "' '" SPRINGBROOK CREEK TO REACH 7 # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PH PIVL PYR +'+ WDM 389 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL 1 162 6 9 "' SUbBasi.n S6 TO REACH 7 END PRINT-INFO WDM 306 FLOW ENGL 0.082645 RCHRES 7 EXTNL IVOL - BASINS GEN-INFO SUBBASIN '•• S7a RCHRES<-------Name------->Nexit Unit Systems Printer "' WDM 144 PERO ENGL 2,2754 RCHRES 7 EXTNL IVOL # - # User t-series Engl Metr LKFG +" WDM 145 SURD ENGL 5.4329 RCHRES 7 EXTNL IVOL in out "' END EXT SOURCES 7 Sub-Basin S7 1 1 1 1 0 0 0 END GEN-INFO EXT TARGETS HYDR-PARM1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ... RCHRES Flags for HYDR section `•' <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg"` # - # VC Al A2 A3 ODFVFG for each ODGTFG for each +" FUNCT for each RCHRES 7 HYDR RO WDM 690 FLOW ENGL AGGR REPL FG FG FG FG possible exit possible exit "` possible exit RCHRES 7 HYDR STAGE WDM 691 STAG ENGL AGGR REPL 1 2 3 1 2 3 4 5 1 2 3 4 5 "' END EXT TARGETS 7 0 1 0 0 4 END HYDR-PARM1 END RUN HYDR-PARM2 RCHRES +'+ # - # DSN FTBN LEN DELTH STCOR KS +'+ 7 7 0.1 4.2 .5 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for HYDR ... # - # VOL Initial value of COLIND ++' Initial value of OUTDGT (ac-ft) for each possible exit "' for each possible exit Date: 03/22/95 File name: DUR ANN.INP Page 1 Date: 03/22/95 File name: DUR ANN.INP Page 2 RUN WDM 391 STAG ENGL 1.00 DURANL 3 INPUT TIMSER GLOBAL WDM 691 STAG ENGL 1.00 DURANL 4 INPUT TIMSER '+' ESG Wetland Existing Conditions Stage Duration NHC INC. 3/31/95 END EXT SOURCES ESG Wetland Existing Conditions Stage Duration NHC INC. 3/31/95 START 1961/10/01 00:00 END 1991/09/30 24:00 END RUN RUN INTERP OUTPUT LEVEL 0 RESUME 0 RUN 1 TSSFL 15 WDMSFL 16 END GLOBAL OPN SEQUENCE INGRP INDELT 1:00 DURANL 1 DURANL 2 DURANL 3 DURANL 4 END INGRP END OPN SEQUENCE FILES <FILE> <UN#>+aa<----FILE NAME-------------------------------------------------> WDM 21 d:\wetbank\wetbank.wdm MESSU 22 dur_ann.OUT 52 dur_ann.drl 53 dur_ann.dr2 54 dur_ann.dr3 55 dur_ann.dr4 INFO 23 c:\hspfl0\HSPINF.DA ERROR 24 c:\hspfl0\HSPERR.DA WARN 25 c:\hspfl0\HSPWRN.DA END FILES DURANL GEN-DURDATA 123456789012345678901234567890123456789012345678901234567890 +++ #thru#< title > ndur nlev prfg punt 6tr' 1 Stage in Wetland C No bank(Annual) 1 20 1 52 2 Stage in Wetland C W/bank (Annual) 1 20 1 53 3 Stage in Wetland F No bank(Annual) 1 20 1 54 4 Stage in Wetland F w/bank (Annual) 1 20 1 55 END GEN-DURDATA SEASON ++' Start End #thru#''s mo da hr mn mo da hr mn 5 11 2 6 3 10 1 4 10 01 00 9 30 24 END SEASON DURATIONS #thru#0b.< --- durations ---> 1 4 1 END DURATIONS LEVELS #thru#'" 1 2 3 4 5 6 7 8 9 10 11 12 13 14 #thru#++' 15 16 17 18 19 20 1 4 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 1 4 11.5 12.0 13.0 14.0 15.0 16.0 END LEVELS END DURANL EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> °bd <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # '++ WDM 291 STAG ENGL 1.00 DURANL 1 INPUT TIMSER WDM 591 STAG ENGL 1.00 DURANL 2 INPUT TIMSER THE CITY OF RENTON DEPARTMENT OF I PL A N NING/BU ILDING/PURL C WORKS FOURTH FLOOR 200 MILL AVENUE SOUTH <; = RENTON, WASHINGTON 98055-2189 FAX: 235-2541 To: Company: Phone: Fax: From: Scar- L3oo o3,)kti Company: Phone: Fax: Cate: Pages including this cover page: L Comments: 7^aL-k ,,� ��s�� tw� �� sn Li C •06 JI 6 '�5 h t •U7 L h f N N N N 000 �L 6 CAulCA ___ MI Mf!M (AWFA ire/ O Q Z MAC r/0 "lA/1 n1.1/0 70 /c- 9N J:i1) w� 316 4TI ow l �[-A c—,r Cew,f txT,4,�r+onl i uR L G fr— /j�4r�/C 4JA/ n 4 L r--,,j G j f/(d ry(j i f..cn, /S YC,vA-�6o 70 ,o:FC �v /2(N6v*) . 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