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HomeMy WebLinkAboutSWP272786(1) i 1 STORM DRAINAGE REPORT 1 for OAKESDALE CENTER 1 BLACKRIVER-RIVERTECH L.L.C. ALPER NORTHWEST, INC., DEVELOPER BLACKRIVER CORPORATE PARK 1 RENTON, WA 1 1 i 1 0 . M OVA G'o lJ� r� 869 � �a ��SS ONALI 1 EXPIRES 12/24/00 1 ' Prepared By: WARNER ENGINEERING 1 5122 Olympic Drive NW, Suite B204 Gig Harbor, WA 98335 1 (253) 858-8577 CITY Of RENTON March 8, 1999 E(r E IV F'O 1 Job Number: 017006 MAR 1 01999 BUILDING DIVISION MAR 0 y 1999 LVJ 1 LPN Architects & Planners TABLE OF CONTENTS ' I. Project Overview II. Existing Conditions Summary ' III. Developed Conditions Summary ary ' IV. Discussion of Core Requirements ' V. Discussion of Special Requirements VI. Conveyance System Analysis and Design ' VII. Water Quality Analysis and Design ' VIII. Appendices Appendix A- Vicinity Map Appendix B - SCS Soil Map tAppendix C - Predeveloped Basin Map Appendix D - Postdeveloped Basin Map t Appendix E - Isopluvial Maps: 2-, 100-Year Appendix F -Runoff Coefficients Appendix G - Waterworks program Calculations Conveyance Water Quality Appendix H -F1owMaster Calculations ' Appendix I - Technical Information Report Worksheet Appendix J- Geotechnical Engineering Study ' IX. References 1 1 2 Oakesdale Center, Renton, WA 1 1 I. PROJECT OVERVIEW ' This project is for the development of five office buildings and associated parking lots. The 12.5 acre site, a portion of the Black River Corporate Park, is bounded on the southwest by Oakesdale Avenue SW, on the southeast by the SW 7`' Street, and on the ' northwest and northeast by the P-1 channel, wetlands and open space. The project encompasses development of the most of the 12.5 acre site. The work shall also include two driveway accesses, one from SW 7'' Street and one from Oakesdale Avenue SW, and landscaping areas. See Appendix A for a vicinity map. ' II. EXISTING CONDITIONS SUMMARY SOILS Soils on the site are identified by the SCS Soil Survey for King County' as Woodinville silt loam (Wo)- see Appendix B for SCS Soils information. The SCS description is as ' follows: Woodinville (Wo) is soil that is poorly drained and formed under grass and ' sedges, in alluvium, on stream bottoms. tThe erosion hazard is slight. Based upon the geotechnical data we will assume that a hydrologic soil group D soil is ' present on the site. EXISTING DEVELOPMENT AND DRAINAGE ' The site currently is comprised of trees and brush areas. The building area of the site is very flat, with a total vertical relief of about 2 to 3 feet, and some depressions. Surface drainage on site is sheet flow to the P-1 Channel. There are no existing drainage structures or developed swales on. See the Predeveloped Basin Map, Appendix C. ' OFF-SITE AND DOWNSTREAM DRAINAGE ' There is no off-site drainage onto this site. See the Predeveloped Basin Map, Appendix C. ' Stormwater from the site flows to the P-1 channel, a portion of Springbrook Creek. Springbrook Creek flows northwest to the Green River. 3 Oakesdale Center, Renton, WA 1 III. DEVELOPED CONDITIONS SUMMARY ' ON-SITE DEVELOPMENT AND DRAINAGE This parcel is exempt from detention requirements. Water quality, however, is still ' required. Storm drainage for the site will be as follows: The site will be graded to sheet flow to the centerline of the parking lot drives and flow into a series of catch basins. Underground pipes will collect the runoff and convey it to a wet pond located on the northwest side of the site adjacent to the P-1 Channel. The wet pond will discharge runoff to the north. Downspouts and ' foundation drains will be piped to the storm system. The wet pond will provide for water quality for those areas subject to vehicular traffic. tSee the Postdeveloped Basin Map, Appendix D. OFF-SITE IMPROVEMENTS AND DRAINAGE No off-site improvements are proposed. ' IV. DISCUSSION OF CORE REQUIREMENTS ' Core Requirement#1-Discharge at the Natural Location As discussed in EXISTING CONDITIONS SUMMARY above, the majority of the site drainage currently drains to the P-1 channel. The proposed storm system will discharge to the P-1 channel via a pipe located at the northwest corner of the property. ' Core Requirement#2- Off-Site Analysis No offsite drainage enters the site. See Appendix C- Predeveloped Basin Map. A Level ' One Downstream Analysis is described in the Existing Conditions Summary. There are no known drainage problems in this system. ' Core Requirement#3-Runoff Control This site is exempt from On-site Peak Rate Runoff Control because the parcel ' participated in the construction of Black River Corporate Park. r k t4 Oakesdale Center, Renton, WA 1 1 Core Requirement#4- Convey System 1 The project storm system will convey the site 100 year design storm. Core Requirement#5-Erosion/Sedimentation Control Plan 1 An Erosion and sedimentation plan will be developed for this site as outlined in the King County Surface Water Design Manual. Filter fences, CB inlet protection, CB inlet 1 sediment trap and construction entrances will be installed. ' Core Requirement#6-Maintenance and Operation Maintenance and operation of all of the stormwater system on this site will be the 1 responsibility of the Oakesdale Center Owner. Core Requirement#7-Bonds and Liability 1 Bonds and liability insurance will be provided by the Alper Northwest Inc. 1 V. DISCUSSION OF SPECIAL REQUIREMENTS 1 Special Requirement#1- Critical Drainage Areas The City has not indicated that this site is in a critical drainage basin. 1 Special Requirement#2- Compliance With Existing Master Drainage Plan 1 There is no existing known Master Drainage Plan that includes this site. Special Requirement#3- Conditions Requiring a Master Drainage Plan 1 This project site does not trigger any of the thresholds that require a Master Drainage p J 1 Plan. Special Requirement#4- Adopted Basin or Community Plans 1 The site is not in any known adopted basin or community plans. 1 1 5 Oakesdale Center, Renton, WA 1 1 1 ' Special Requirement#5- Special Water Quality Controls t A wet pond will be constructed to provide water quality for all impervious surfaces subject to vehicle traffic, since more than 1 acre of impervious surface is subject to vehicle traffic, that is designed per the King County Surface Water Design Manual. ' Special Requirement#6- Coalescing Plate Oil/Water Separators ' A coalescing plate oil/water separator is not required. Special Requirement#7- Closed Depression tThere are no closed depressions on the project site. ' Special Requirement #8- Use of Lakes Wetlands or Closed Depressions for Peak Runoff Control ' The project will not use a lake,wetland or closed depression for peak runoff control. ' Special Requirement#9- Delineation of 100 Year F000dplain The elevation of the 100-year flood plain is equal to 18.44 The 100-year floodplain is ' shown on the siteplan. Special Requirement#10- Flood Protection Facilities for Type 1 and 2 Streams ' This project is within 200 ft of the hi hwater line for the P-1 channel. The 200 ft line is P J g shown on the site plans. A shoreline permit will be required for this project. Special Requirement#11- Geotechnical Analysis and Report ' A geotechnical analysis and report is included as Appendix J. ' Special Requirement#12- Soils Analysis and Report Soils report is included as Appendix J. ' Special Requirement#13 - Aquifer Recharge and Protection Areas ' This site is not in an aquifer recharge or protection area. 1 6 Oakesdale Center, Renton, WA 1 VI. CONVEYANCE SYSTEM ANALYSIS AND DESIGN ' See Appendix G for basin information. Summarized below are the preliminary design data ' Constants P2 =2.0 in. Soil Type D P 10 =2.9 in. CN=90.0 short grass/landscaping P100=3.9 in. CN=98.0 impervious For ease of conveyance calculations basins were assumed to be 100% impervious. ' (See Appendix H for WaterWorks Printouts). ' VII. WATER QUALITY ANALYSIS AND DESIGN The wet pond is designed per City of Renton standards. The design volume (total of dead ' storage in three cells) is equal to 1.5 times the volume of the water quality storm. The water quality storm is 1/3 P2. See Appendix G and Appendix H for computer ' calculations. Vrequirea= 1.5(16,169 cf) =24,253 cf The required surface area is equal to 1%of the total impervious surface=4085 sf. ' 10% of the pond surface area is required for Cell A. 45%of the pond surface area is required for Cell B. 1 Surface Dead Storage Volume c Area(sf) g tCell A 1389.00 2348.00 Cell B 5669.00 13037.00 ' Cell C 4243.00 9110.00 ' Total 11301.00 24495.00 ' 7 Oakesdale Center, Renton, WA 1 1 ' V. APPENDICES Appendix A-Vicinity Map ' Appendix B - SCS Soil Map Appendix C - Predeveloped Basin Map Appendix D - Postdeveloped Basin Map ' Appendix E - Isopluvial Maps: 2-, 100-Year Appendix F -Runoff Coefficients Appendix G- Waterworks program Calculations ' Conveyance Water Quality Appendix H - Flowmaster Calculations Appendix I - Technical Information Report Worksheet Appendix J- Geotechnical Engineering Study 1 8 Oakesdale Center, Renton, WA 1 ' VI. REFERENCES Soil Survey of King County Area, Washington. United States Department of Agriculture, Soil Conservation Service. November 1973. ' II. Surface Water Design Manual King County, Washington. King County Department ' of Public Works. January 1990. Revised November 1995. Waterworks. Software for Hydrology. Version 4.12e. Engenious Systems, Inc. Seattle, Washington. ' IV. Flowmaster. Version 4.1. Haestad Methods, Inc. Waterbury, ' Connecticut. 9 Oakesdale Center, Renton, WA S 1124 1 ST s u,n F•�.' ^S t a 1 � s s r i S U�0 �.ran[+ua p s s: N - S 125 ST V SKYMAY r" 12tTN 5 ■ trtnr t r` u� 9 � 6TH zY' 5 d O S PARK�i FS LIB o St i rm.nm }x �t26 51 H FgCo 1 S�'� ` < R y� S� f>•1 Pwrt 2 2 NYC" N o i fir° a s nww R " y S 127TN P os � •+t. S `� � I <$ � �' <i ��> r z✓ 1 � $P h 128TH ST ]28TH � ST iienl I '� w TM '= SST <'1 6800 S,S129 POT S 129TH ST '< 8200 ST ' 'P IC 71 r 4O S iE 1AN`TON RD e� 1zTM ti Sr t g "' O REHTa1 _ -+ -a- AIRPORT.•. 4 ab y S w 5t 1 HD ST 1i.sr Cr Rf AON HST $ 9G I ! 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' S �� VICINITY MAP Geo l Engineers FIGU--APPENDIX A IVA•1IMN Z!)r .nviur. t122° 5' R.4 E. R.5 E. SEATTLE(CITY P.D.)io Mr.]2'30" 6 Mi. TO INTERSTATE 90 b05 AkF (Joins 17-3 0 ;t i r Suosta m 667 Ura ■ �'i y•: U. ' �,• i AgD ,I E T r AB B1a River . t• D.a A R 0 I ••: it i SM 4 I Athletic I r BM `Field rtc 3 EvD a • © � O = i AkF1 ' iL 77 900 ., •,BeD ■ .- I •��. D _ .y= Park Pc 254 .: ■ ♦ .fix\ an p BeD Hh ,BeC• NJ p �•.�. .•� t. Ir RSe I A ROADTu •.f� o F d ' ty• ��. ``., d� i ' i n� p obi Ng�) RgOf L \r—�/• ,� h ,^IO Rti PROJECT SITE co • • AkF I --- — --0 Ur ,I -d -f InC ---!-- U Fly �13 Pu r Ng BeC Golf). I + I _- sta I AmC � o I A W � PA IFS � i, ' � • I � � InC a\130 M= O �• Sew ge pRTHE 1 .- �' ' ♦ I u - ---.=i - GyO o�Disp salSubs Ld ,i • qgC y 2 Ng Ur Jr �' :i - ax i t _M 16 :12G •a. j G O AgD 20 �prJ 1 Ur •F F \� PU Longacre4:gg 515 O ••'�1 I Ryleu n:mm Py 1 ==-,I 1).BeCI ' l 405 _,v Ur i Ur 1 Wo BeD oil n i Y�i Ur •�i• .ii, I (AgD •'�, o 1 Track -'� z- r 1 i i 29 ::- IOU, ----- 6 Ur '� h u ' Ur I y 1 Ng I �O R s rvoir AgC - D • I 2 W Py Pu ° Sk 1 Wo I M r � I 25 0 -; IBM .29• Al ^Cy i 169. i 203 AgC Z o PY Sk 1 ■ �. ' I Wo "' Ur I o IAg • - s ■I ea - --- -- -- - :� aq,a µ- l t� 1Ur Tu 1 InC AeB Ili. �° APPENDIX B. a So ••- �, =I I �\ MI 1� ' GUIDE To MAPPING UNITS--Continued Woodland Described Capability unit group I on M s Y mbol Mapping unit page Symbol Page Symbol 26 IIIw-1 75 awl Re Renton silt loam---------------------""'---------- _ 27 VIIIw-1 78 --- Rh Riveiwash------------------------------------- ----------------------------- 27 IIw-1 74 2ol Sa Salal silt loam------------------------------ ____-- 27 IIw-2 75 3w1 Sh Sammamish silt loam----------------------------------------- 28 IIw-3 75 --- ' Sk Seattle muck------------------------------------------------ 29 IIw-3 75 --- SM Shalcar Shalcar muck-------------------------- 29 IIw-1 74 201 Sn Si silt loam------------- 30 IIw-2 75 3w2 --------------------------------- So Snohomish silt loam-------- 31 IIw-2 75 3w2 Sr Snohomish silt loam, thick surface variant----------- 31 IIw-1 74 awl ---------------------- Su Sultan silt loam--------------- ___ Tu Tukwila muck------------------------------------------------ 32 IIw-3 75 33 -------- -- --- Ur Urban land--------- - 33 IIw-2 75 3w2 Wo Woodinville silt loam-------------------------------------- 1/ The composition of these units is more variable than that of the others in the Area, but it has been controlled well enough to interpret for the expected use of the soils. 1 1 1 1 - r , fk v -44a ' STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN 1 —[ Hydrologic Soil Hydrologic Soil ' Group Soil Type Gr°up Soil Type B Spanaway TND Newberg ' Nisqually B Springdale C Suluvar Nooksack m Nora CID Sultan C Sultan variant ' Ogarty Olete ND Sunua C Swa=wn Oloo-,V c D Olympic B Tacoma D Tanwax ND 1 Orcas D Tulwhit ?r Orid'u ND Tenino C Oning co D O C Tisch C Tokul ND Oso C Townsend C Paatik ND Pheeoey C Triton ND Tukwila D Phelan C Tukey ND Pilchuck' C Urban n variable pocchub C Vailton B Poulsbo Verlot C Prather D Wapato ND Puget ND Warden B B tj Puyallup ND . Whidbey ND Quilc ' Wilkes-on cne A , B Winston Ragrur C Woodinville B ' - Rainier B Yclm C Raught B Reed ND Zynb+r t Hydrologic Soil Group Classifications ' A. (Low runoff poteatland.consistingvch Soils giefly high ofinfiltration deep, well—tot e excessivelydrained thoroughly wetted, . sands or gravels. These soils have a high rate of water transmission. B. (Moderately low runoff potential) . Soils having moderate infiltration rates ' when thoroughly wetted, and consisting chiefly of moderately fine to moderately coarse textures. These soils have a moderate rate of water transmission. C. (Moderately high runoff potential) . soils having slow infiltration rates when with layer that impedes thoroughly wetted, and consisting chiefly of soils ' downward movement of water, or soils with moderately finee to fine textures. These soils have a slow rate of water transmission. D. (High runoff potential) . Soils having very slow infiltration rates when thoroughly wetted and consisting chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a hardpan or clay layer at or near the surface, and shallow soils over nearly impervious material. These soils have a very slow rate of water transmission. ND Data not currently available for this soil type. *From SCS, TR-55, Secon Edition, June 1986, Exhibit A—l. Revisions made from SCS, Soil Interpretation Record, Form #5, September 1988 and various county soi _ surveys. III-1-10 FEBRUARY, 1992 1 X 13.8. ` /. ... •.� x. 7 N ,qvT x. xxx. •1� %x•x�, /� xt� x• Xx. F x. X. •i i '" liff 1 -1: 00� f^� , ^'M+�.-��.-,..�_��•---..� I. � �l X. x f3.� 7 // yy•� x. X •' f i /we f@. x x. x. x Xx.Kx. S 1 3 f!3 r e�2 x737 �, +`e ✓,,..''- 20 z• >sc. x x. xo + x �` �• ` a X 41 ' x tS3 f _ x. X x. x'4.35 X / e X• �e �� 3r y x ,q. x. x?2 F- -_-�. + 5� + ; o X• x' XX. X. x• q y X X 7 x f2 ,n� �.` X. ,i i♦ee, X••t. x xt +i X. �J}� i aS Oa x' DRIVr'NAY.._ t ryti°F. x 7 5 ff E ,yy Y a Vt t � } x 7 x. i x M1,yd! '1n . ,1w ' X' ,ia , -15' UTILITY x 2d`+'@ EASEMENT �, x. x 13.9 r PER PLAT i + �' fie' r x x.cr x. 1 y�.�,y ` f- STORM DRAIN MANHOLE \ EJB x t3d3 i A c4 i i x 1 1x• RtMX21.30 l yx ` $�• r w.1 q ' x 7M 6 3>5t3 �19 +�°' o f +7' i� x• I x. �e �, � X 1A, i t 1 t x X .}' 9 �V•p � t xr..ti � �' �• x?a4A .3 i } 7} 1 �:p j 1 1• 'V` O 1i X td.q 2 i EASEMENT FOR FLOOD CONTROL AND x tx , 14-:v RELATED PURPOSES, REC. NO. 6607884 �' \ �` _ ��` � _ x• �; t i x,'S. 1 x 73.4 � ' t 1 x1b i ` t � �� X. ! i t ��F kz.24jd sow{ a ,� �y6� i a ( � 1 ��`• '`, t �t. ) '41 _ x,K. �• 3.@ N i t t� 2 X 13A4 i 41p� CS�Y7 . r. '�i.. ' j1' tas ,55h► rra yam;8 20 A 13.8 y •` X 74.7 // o � 1 i•3 a 3l � "mot x. L1 ?i.. ' J r y t 5 1• ,3 ) + X ° +'O t} 1 v'.n zxcrk s fi /// L :X 13.5 1�ja3 ry, Ilryo 1P 0' /J�y.. 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X.. 49 X,.4. � ' t,^� 0.4 • 0.45 ♦ xx 1 �lj 9.50 X 6.32 IN v it Da\ X 8.29 x -1163 x 11 x 6.35 X.- i -4--� , - x . Al 1 161 . 1 110 1 X 6.25 117 v fL 3.20 241 Ck ' x+ ,+. i � t a /• Ot .. -`� / ! n._J° .M1pt� •"'"" � x 6.34 5 5 10 t All <8.29 xis oor AsiN..-46- T K d, ,2"k co :Tiu x 18! 15 +EASEMENT PER PLAT ♦ A NV Ap -;p x. 'Si 61D X.. x + X.. CATCH R M. 80 RE 'N -W 13AS,N CONCREM WALK ,x STO T4A,!N MANHOLE ST;a Rig t T .8 qV LIG 11 liI5 ffl?IAC. N E X. gg' `Rax �,, t°� __`5 4 R OF 2.7 3O"CQNS.,3k.A.j TX- r •tl CH BAN X 3.34 RIM ;w 15.9 (8*pvc W.) • &10 �Vx VIC X. CATCH BASN- i-!YD X t 1 -�, LL 21 x 3.3jK 3. X. RI .8A x AN m 2102 IN 18.2 (SP%IC N.E. �KF TCH IN -Y..34 POSTIDEVELOPED VAff x 3.3, x R, X STORM RAIN MANHOLE z RIM 21.34. 0 BASIN MAP X 1.34 X INV"l 11411 11 S.E.) .3. x 0.72 INV X. 17.8 S'PYC S.W.) ELEClRIC T VAULT X 19.02 RFAPPENDIX D X. CATCH 8'-qN X 3.34 1p N I,-r, T -/,/ \em ER x 3-231 AJx a-li�- ALD'- • � . ' t V N ���- �! ice" ��Iri�7•',. ��• �, `� .� G • e WMA �r$ G _ r . �► . i STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN ' Table III-1.3 SCS Western Washington Runoff Curve Numbers (Published by SCS in 1982) Runoff curve numbers for selected agricultural, ' suburban and urban land use for Trpe lA rainfall distribution, 24-hour storm duration. LAND USE DESCRIPTION CURVE NUMBERS BY HYDROLOGIC SOIL GROUP ' A B C D Cultivated land(1) : winter condition 86 91 94 95 ' Mountain open areas low growing brush & grasslands 74 82 89 92 : 65 78 85 89 Meadow or pasture: ' 42 64 76 81 Wood or forest land: undisturbed second growth or brush 55 72 81 86 Wood or forest land: young ' Orchard: with cover crop 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. 68 80 86 90 ' Good condition: grass cover on z75$ of the area 77 85 90 92 Fair condition: grass cover on 50-75% of the area ' Gravel roads & parking lots: 76 85 89 91 72 82 87 89 Dirt roads & parking lots: ' Impervious surfaces, pavement, roofs etc. 98 98 98 98 Open water bodies: lakes, wetlands, ponds etc. 100 100 100 100 tSingle family residential(2) : Separate curve number Dwelling Unit/Gross Acre %Imp15vious(3) shall be selected for ' 1.0 DU/GA 20 pervious & impervious 1.5 DU/GA 25 portions of the site 2.0 DU/GA 30 or basin 2.5 DU/GA ' 3.0 DU/GA 34 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 ' 5.0• DU/GA 4$ 5:5•DU/GA 50 6.0 DU/GA 52 6.5 DU/GA 54 ' 7.0 DU/GA 56 PUD's,- condos; apartments, %impervious commercial businesses ,& must be industrial. .areas computed. (1) For a-more o£.: agriculturdrolQ land_ Cse curve numbers 1972r to National Engineering. Handbook Sec.. Hy . gy, hap ' (2) Assumes roof.'. and driveway runoff is directed into .str,eet/storm system. {3). The remaining pervious areas .( .awn)' are considered to be in good condition for these curve numbers. III-1-22 _ FEBRUARY, 1992 APPENDIX F 3/5/99 1: 0:44 pm Warner Engineering page 1 ' BLACKRIVER CORPORATE PARK WATER QUALITY CALCS PREPARED BY: CAROL MODJESKI _____________________________________________________________ BASIN SUMMARY ' BASIN ID: WQ-PRELM NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 9. 38 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 0. 67 inches AREA. . : 0. 00 Acres 9 .38 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98 . 00 ' TC. . . . . 0. 00 min 5. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 1. 26 cfs VOL: 0. 37 Ac-ft TIME: 470 min 1 1 APPENDIX G t3/5/99 12 : 44: 6 am Warner Engineering page 1 BLACKRIVER CORPORATE PARK ' CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI BASIN SUMMARY BASIN ID: CB002 NAME: ' SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 34 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0. 34 Acres TIME INTERVAL. . . . . 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 35 cfs VOL: 0. 10 Ac-ft TIME: 470 min BASIN ID: CB003 NAME: ' SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 33 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP ' PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0. 33 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 34 cfs VOL: 0. 10 Ac-ft TIME: 470 min BASIN ID: CB004 NAME: ' SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 11 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 11 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98 . 00 TC. . . . . 0. 00 min 5. 00 min ABSTRACTION COEFF: 0. 20 ' PEAK RATE: 0. 11 cfs VOL: 0. 03 Ac-ft TIME: 470 min BASIN ID: CB005 NAME: ' SBUH METHODOLOGY . TOTAL AREA. . . . . . . • 0. 26 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP ' PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0. 26 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ABSTRACTION COEFF: 0. 20 ' PEAK RATE: 0. 26 cfs VOL: 0. 08 Ac-ft TIME: 470 min 3/5/99 12 : 44 : 6 am Warner Engineering page 2 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' BASIN SUMMARY ' BASIN ID: CB006 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 32 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 32 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98 . 00 TC. . . . . 0. 00 min 5. 00 min t ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 32 cfs VOL: 0. 10 Ac-ft TIME: 470 min ' BASIN ID: CB007 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 57 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0.57 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 58 cfs VOL: 0. 17 Ac-ft TIME: 470 min ' BASIN ID: CB008 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 37 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 37 Acres TIME INTERVAL. . . . . 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 38 cfs VOL: 0. 11 Ac-ft TIME: 470 min ' BASIN ID: CB009 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 15 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 15 Acres TIME INTERVAL. . . . . 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 15 cfs VOL: 0. 05 Ac-ft TIME: 470 min 3/5/99 12 :44 : 6 am Warner Engineering page 3 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' BASIN SUMMARY=====_______________________ ' BASIN ID: CBO10 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 00 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 00 cfs VOL: 0. 00 Ac-ft TIME: 0 min ' BASIN ID: CBO11 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1. 18 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 1. 18 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . . 0. 00 98. 00 TC. . . . . 0. 00 min 5.00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 1. 21 cfs VOL: 0. 36 Ac-ft TIME: 470 min ' BASIN ID: CB012 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.56 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0.56 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . . 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 58 cfs VOL: 0. 17 Ac-ft TIME: 470 min ' BASIN ID: CB013 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 31 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP ' PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 31 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5.00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 31 cfs VOL: 0. 09 Ac-ft TIME: 470 min 1 1 3/5/99 12 :44 : 6 am Warner Engineering page 4 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' BASIN SUMMARY=====_______________________ ' BASIN ID: CB014 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.40 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0.40 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 41 cfs VOL: 0. 12 Ac-ft TIME: 470 min ' BASIN ID: CB015 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.47 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0. 47 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0.48 cfs VOL: 0. 14 Ac-ft TIME: 470 min ' BASIN ID: CB016 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 32 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 32 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . . 0. 00 98. 00 TC. . . . . 0. 00 min 5.00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 33 cfs VOL: 0. 10 Ac-ft TIME: 470 min ' BASIN ID: CB017 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 35 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 35 Acres TIME INTERVAL. . . . . 10. 00 min CN. . . . : 0. 00 98 . 00 TC. . . . . 0. 00 min 5.00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 36 cfs VOL: 0. 11 Ac-ft TIME: 470 min 1 3/5/99 12 :44: 6 am Warner Engineering page 5 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI BASIN SUMMARY ' BASIN ID: CB018 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.28 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0.28 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0.20 PEAK RATE: 0.29 cfs VOL: 0. 09 Ac-ft TIME: 470 min ' BASIN ID: CB019 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.94 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0.94 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 ' TC. . . . . 0. 00 min 5. 00 min ABSTRACTION COEFF: 0. 20 . PEAK RATE: 0.96 cfs VOL: 0. 29 Ac-ft TIME: 470 min ' BASIN ID: CB020 . NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 10 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98 . 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 10 cfs VOL: 0. 03 Ac-ft TIME: 470 min ' BASIN ID: CB021 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.27 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0.27 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 27 cfs VOL: 0. 08 Ac-ft TIME: 470 min 3/5/99 12 :44 : 6 am Warner Engineering page 6 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' BASIN SUMMARY=====_______________________ ' BASIN ID: CB022 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 14 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . . 3 . 90 inches AREA. . : 0. 00 Acres 0. 14 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 ' TC. . . . : 0. 00 min 5. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 14 cfs VOL: 0. 04 Ac-ft TIME: 470 min ' BASIN ID: CB023 NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.57 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0. 57 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 ' TC. . . . : 0. 00 min 5. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 58 cfs VOL: 0. 17 Ac-ft TIME: 470 min ' BASIN ID: CB024 . NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.42 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0.42 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98.00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 43 cfs VOL: 0. 13 Ac-ft TIME: 470 min BASIN ID: CB025 . NAME: SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.23 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0. 00 Acres 0. 23 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 5. 00 min ' ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 23 cfs VOL: 0.07 Ac-ft TIME: 470 min 1 3/5/99 12 :44 : 6 am Warner Engineering page 7 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' BASIN ID: CB026 NAME: SBUH METHODOLOGY TOTAL AREA. . .. . . . : 0.43 Acres BASEFLOWS: 0. 00 cfs ' RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0.43 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 t TC. . . . . 0. 00 min 5. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0.44 cfs VOL: 0. 13 Ac-ft TIME.• 470 min 1 1 1 1 1 1 1 3/5/99 12 : 44 : 6 am Warner Engineering page 8 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' REACH SUMMARY=====_______________________ ' Network Reach N1 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ' =D====`Ac)===(ft)=====(ft)-_ft/ft =========(cfs) (ft) `fps)===(fPs'====___ P007 0.27 0.67 102.00 0.0049 0.0120 0.27 27.49 0.25 37.27 2.29 2.91 CB021 t P006 0.84 0.67 127.00 0.0050 0.0120 0.86 85.74 0.50 75.75 3.02 2.94 CB007 P005 1.16 1.00 175.00 0.0050 0.0120 1.18 40.12 0.46 45.91 3.36 3.85 CB006 ' Network Reach N2 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) ' P004 1.70 1.00 142.00 0.0050 0.0120 1.74 58.96 0.58 57.81 3.69 3.85 CB005 P003 1.80 1.00 70.00 0.0050 0.0120 1.84 62.60 0.60 60.09 3.74 3.85 CB004 ' P002 2.13 1.00 211.00 0.0060 0.0120 2,18 67.60 0.63 63.26 4.16 4.21 CB003 Network Reach N3 ' REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ID (Ac) (ft) (ft) ft/ft -- - (cfs) - (ft) (fps) (fps) ' P012 0.56 0.67 356.00 0.0074 0.0120 0.58 47.5-2 0.34 50.66 3.25 3.57 CB012 P011 1.75 1.00 108.00 0.0050 0.0120 1:78 60.56 0.59 58.81 3.71 3.85 CB011 ' Network Reach N4 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) ' P014 0.35 0.67 50.00 0.0050 0.0120 0.36 35.61 0.29 42.93 2.48 2.94 CB017 P013 0.67 0.67 76.00 0.0464 0.0120 0.68 22.47 0.22 33.48 6.67 8.94 CB016 Network Reach N5 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C Area ID====(Ac)===(ft)=====(ft)--ft/ft =========(cfs) (ft) (fps)===(fps)====___ P017 0.47 0.67 102.00 0.0050 0.0120 0.48 47.99 0.34 50.95 2.68 2.94 CB015 P016 0.87 0.67 147.00 0.0050 0.0120 0.89 88.71 0.52 78.13 3.03 2.94 CB014 P015 1.17 1.00 46.00 0.0050 0.0120 1.20 40.71 0.46 46.30 3.37 3.85 CB013 1 1 3/5/99 12 : 44 : 6 am Warner Engineering page 9 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI REACH SUMMARY ' Network Reach N6 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C Area ID====(Ac)===`ft)=====(ft)_-ft/ft =========(cfs) (ft) (fps)===(fps)====___ P010 3.59 1.25 92.00 0.0040 0.0120 3.66 76.76 0.87 69.26 4.04 3.99 C8010 ' P009 3.74 1.25 85.00 0.0040 0.0120 3.82 79.95 0.89 71.47 4.07 3.99 CB009 ' Network Reach N7 - - -- - REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ID (Ac) (f't) (ft) ft/ft - (cfs) (ft) (fps) (fps) ' P023 1.08 1.00 158.00 0.0050 0.0120 1.10 37.30 0.44 44.06 3.29 3.85 CB024 P022 1.64 1.00 100.00 0.0050 0.0120 1.68 56.98 0.57 56.58 3.66 3.85 CB023 P021 1.78 1.00 104.00 0.0050 0.0120 1.82 61.80 0.60 59.59 3.73 3.85 CB022 P020 2.05 1.00 118.00 0.0050 0.0120 2.09 71.04 0.65 65.47 3.84 3.85 CB021 ' P019 2.15 1.00 151.00 0.0050 0.0120 2.19 74.47 0.68 67.73 3.87 3.85 CB020 P018 3.08 1.25 205.00 0.0041 0.0120 3.15 65.12 0.77 61.68 3.96 4.04 CB019 ' PIPE REACH ID No. P001 From: To: Pipe Diameter: 1. 2500 ft n: 0. 0120 ' Pipe Length 76. 0000 ft s: 0. 0047 Up invert 12 . 1100 ft down invert: 11. 7528 ft t Collection Area: 2 . 4730 Ac. Design Flow 2 . 5263 cfs Dsgn Depth: 0. 64 ft Pipe Capacity 5. 1748 cfs Design Vel 3 . 9681 fps Travel Time: 0. 32 min Pipe Full Vel 4 . 3276 fps PIPE REACH ID No. P002 ' From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length ,: 211. 0000 ft s: 0. 0060 Up invert 13 . 3700 ft down invert: 12 . 1040 ft ' Collection Area: 2 . 1340 Ac. Design Flow 2 . 1800 cfs Dsgn Depth: 0. 63 ft ' Pipe Capacity 3 . 2247 cfs Design Vel 4 . 1628 fps Travel Time: 0. 84 min Pipe Full Vel 4 . 2137 fps 1 3/5/99 12 : 44: 6 am Warner Engineering page 10 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' REACH SUMMARY=====_______________________ ' PIPE REACH ID No. P003 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 ' Pipe Length 70. 0000 ft s: 0. 0050 Up invert 13 .7200 ft down invert: 13 . 3700 ft ' Collection Area: 1.8040 Ac. Design Flow 1.8429 cfs Dsgn Depth: 0. 60 ft Pipe Capacity 2 . 9437 cfs Design Vel 3 .7387 fps Travel Time: 0. 31 min ' Pipe Full Vel 3 . 8466 fps PIPE REACH ID No. P004 ' From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length 142 . 0000 ft s: 0.0050 ' Up invert 14 .4300 ft down invert: 13 .7200 ft Collection Area: 1. 6990 Ac. Design Flow 1. 7356 cfs Dsgn Depth: 0.58 ft Pipe Capacity 2 . 9437 cfs Design Vel 3 . 6890 fps Travel Time: 0. 64 min Pipe Full Vel 3 . 8466 fps ' PIPE REACH ID No. P005 ' From: To: ' Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length : 175. 0000 ft s: 0. 0050 Up invert 15. 3100 ft down invert: 14 .4350 ft ' Collection Area: 1. 1560 Ac. Design Flow 1. 1809 cfs Dsgn Depth: 0.46 ft Pipe Capacity 2 . 9437 cfs ' Design Vet 3 . 3562 fps Travel Time: 0.87 min Pipe Full Vel 3 . 8466 fps PIPE REACH ID No. P006 From: To: Pipe Diameter: 0. 6667 ft n: 0.0120 Pipe Length 127 . 0000 ft s: 0. 0050 ' Up invert 15. 9500 ft down invert: 15. 3150 ft Collection Area: 0. 8380 Ac. ' Design Flow 0. 8561 cfs Dsgn Depth: 0.50 ft Pipe Capacity 0.9984 cfs Design Vel 3 . 0177 fps Travel Time: 0.70 min Pipe Full Vel 2 . 9355 fps 1 3/5/99 12 :44 :6 am Warner Engineering page 11 ' BLACKRIVER CORPORATE PARK CONVEYANCE .CALCS PREPARED BY: CAROL MODJESKI REACH SUMMARY ' PIPE REACH ID No. P007 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 ' Pipe Length 102 . 0000 ft s: 0. 0049 Up invert. 16.4500 ft down invert: 15. 9502 ft ' Collection Area: 0. 2660 Ac. Design Flow 0. 2717 cfs Dsgn Depth: 0.25 ft Pipe Capacity 0.9884 cfs Design Vel 2 .2920 fps Travel Time: 0.74 min ' Pipe Full Vel 2 .9060 fps PIPE REACH ID No. P008 ' From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 99 . 0000 ft s: 0.0050 ' Up invert • 14 . 9300 ft down invert: 14 . 4350 ft Collection Area. 0. 2840 Ac. Design Flow 0. 2901 cfs Dsgn .Depth: 0.26 ft Pipe Capacity 0. 9984 cfs Design Vel 2 . 3510 fps Travel Time: 0.70 min Pipe Full Vel 2 . 9355 fps ' PIPE REACH ID No. P009 From: To: ' Pipe Diameter: 1. 2500 ft n: 0. 0120 Pipe Length 85. 0000 ft s: 0. 0040 Up invert 12 . 4500 ft down invert: 12 . 1100 ft ' Collection Area: 3 .7360 Ac. Design Flow 3 .8165 cfs Dsgn Depth: 0.89 ft Pipe Capacity 4 .7739 cfs ' Design Vel 4 . 0667 fps Travel Time: 0.35 min Pipe Full Vel 3 . 9923 fps PIPE REACH ID No. P010 ' From: To: Pipe Diameter: 1. 2500 ft n: 0. 0120 Pipe Length 92 . 0000 ft s: 0. 0040 ' Up invert 12 .8200 ft down invert: 12 . 4520 ft Collection Area: 3 . 5870 Ac. ' Design Flow 3 . 6643 cfs Dsgn Depth: 0.87 ft Pipe Capacity 4 . 7739 cfs Design Vel 4 . 0401 fps Travel Time: 0. 38 min Pipe Full Vel 3 . 9923 fps 1 1 3/5/99 12 :44: 6 am Warner Engineering page 12 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI REACH SUMMARY ' PIPE REACH ID No. P011 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 ' Pipe Length 108 . 0000 ft s: 0. 0050 Up invert 13 . 3600 ft down invert: 12 . 8200 ft ' Collection Area: 1. 7450 Ac. Design Flow 1.7826 cfs Dsgn Depth: 0. 59 ft Pipe Capacity 2 .9437 cfs Design Vel 3 .7112 fps Travel Time: 0.49 min ' Pipe Full Vel 3 . 8466 fps PIPE REACH ID No. P012 ' From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 356. 0000 ft s: 0. 0074 ' Up invert 16. 0000 ft down invert: 13 . 3656 ft Collection Area: 0. 5650 Ac. Design Flow 0. 5772 cfs Dsgn Depth: 0.34 ft ' Pipe Capacity 1. 2147 cfs Design Vel 3 .2523 fps Travel Time: 1. 82 min Pipe Full Vel 3 . 5712 fps tPIPE REACH ID No. P013 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 ' Pipe Length 76. 0000 ft s: 0. 0464 Up invert 16. 3500 ft down invert: 12 .8236 ft ' Collection Area: 0. 6690 Ac. Design Flow 0. 6834 cfs Dsgn Depth: 0. 22 ft Pipe Capacity 3 . 0416 cfs ' Design Vet 6. 6691 fps Travel Time: 0. 19 min Pipe Full Vel 8. 9424 fps PIPE REACH ID No. P014 ' From: To: Pipe Diameter: 0. 6667 ft n: 0.0120 Pipe Length 50. 0000 ft s: 0. 0050 ' Up invert 16. 6000 ft down invert: 16. 3500 ft Collection Area: 0. 3480 Ac. ' Design Flow 0. 3555 cfs Dsgn Depth: 0. 29 ft Pipe Capacity 0. 9984 cfs Design Vel 2 . 4826 fps Travel Time: 0. 34 min Pipe Full Vel 2 . 9355 fps 1 3/5/99 12 : 44 : 6 am Warner Engineering page 13 ' BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' REACH SUMMARY=====_______________________ ' PIPE REACH ID No. P015 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 ' Pipe Length 46. 0000 ft s: 0. 0050 Up invert 13 . 0500 ft down invert: 12 . 8200 ft ' Collection Area: 1. 1730 Ac. Design Flow 1. 1983 cfs Dsgn Depth: 0. 46 ft Pipe Capacity 2 . 9437 cfs Design Vel 3 . 3686 fps Travel Time: 0. 23 min ' Pipe Full Vel 3 . 8466 fps PIPE REACH ID No. P016 ' From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 147 . 0000 ft s: 0. 0050 Up invert 15. 1300 ft down invert: 14 . 3950 ft ' Collection Area: 0. 8670 Ac. Design Flow 0. 8857 cfs Dsgn Depth: 0 . 52 ft ' Pipe Capacity 0. 9984 cfs Design Vel 3 . 0270 fps Travel Time: 0.81 min Pipe Full Vel 2 . 9355 fps ' PIPE REACH ID No. P017 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 102 . 0000 ft s: 0. 0050 Up invert 15 . 6400 ft down invert: 15. 1300 ft ' Collection Area: 0. 4690 Ac. Design Flow 0 . 4791 cfs Dsgn Depth: 0. 34 ft Pipe Capacity 0. 9984 cfs Design Vel 2 . 6805 fps Travel Time: 0. 63 min Pipe Full Vel 2 . 9355 fps PIPE REACH ID No. P018 ' From: To: Pipe Diameter: 1. 2500 ft n: 0. 0120 Pipe Length 205 . 0000 ft s: 0. 0041 ' Up invert 12 . 6000 ft down invert: 11. 7595 ft Collection Area: 3 . 081.0 Ac. Design Flow 3 . 1474' cfs Dsgn Depth: 0.77 ft Pipe Capacity 4 . 8332 cfs Design Vel 3 . 9621 fps Travel Time: 0. 86 min Pipe Full Vel 4 . 0419 fps 3/5/99 12 :44: 6 'am Warner Engineering page 14 BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI t REACH ' PIPE REACH ID No. P019 From: To: Pipe Diameter: 1. 0000 ft n: 0.0120 ' Pipe Length 151. 0000 ft s: 0. 0050 Up invert 13 . 3600 ft down invert: 12 . 6050 ft ' Collection Area: 2 . 1460 Ac. Design Flow 2 . 1922 cfs Dsgn Depth: 0. 68 ft Pipe Capacity 2 .9437 cfs Design Vel 3 .8721 fps Travel Time: 0. 65 min ' Pipe Full Vel 3 .8466 fps PIPE REACH ID No. P020 ' From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length 118 . 0000 ft s: 0. 0050 Up invert 13 .9500 ft down invert: 13 . 3600 ft Collection Area: 2 . 0470 Ac. Design Flow 2 . 0911 cfs Dsgn Depth: 0. 65 ft ' Pipe Capacity 2 . 9437 cfs Design Vel 3 . 8378 fps Travel Time: 0.51 min Pipe Full Vel 3 . 8466 fps ' PIPE REACH ID No. P021 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 ' Pipe Length : 104 . 0000 ft s: 0. 0050 Up invert 14 .4700 ft down invert: 13 .9500 ft ' Collection Area: 1. 7810 Ac. Design Flow 1. 8194 cfs Dsgn Depth: 0. 60 ft Pipe Capacity 2 . 9437 cfs Design Vel 3 .7279 fps Travel Time: 0. 46 min tPipe Full Vel 3 . 8466 fps PIPE REACH ID No. P022 ' From: To: Pipe Diameter: 1. 0000 ft n: 0.0120 Pipe Length 100. 0000 ft s: 0. 0050 ' Up invert 14 .9700 ft down invert: 14 . 4700 ft Collection Area: 1. 6420 Ac. Design Flow 1. 6774 cfs Dsgn Depth: 0. 57 ft ' Pipe Capacity 2 .9437 cfs Design Vel 3 . 6600 fps Travel Time: 0.46 min Pipe Full Vel 3 .8466 fps 1 3/5/99 12 : 44:6 am Warner Engineering page 15 BLACKRIVER CORPORATE PARK CONVEYANCE CALCS PREPARED BY: CAROL MODJESKI ' REACH SUMMARY=====_______________________ ' PIPE REACH ID No. P023 From: - To: Pipe Diameter: 1. 0000 ft n: 0. 0120 ' Pipe Length 158 . 0000 ft s: 0. 0050 Up invert 15.7600 ft down invert: 14 .9700 ft ' Collection Area: 1. 0750 Ac. Design Flow 1.0982 cfs Dsgn Depth: 0.44 ft Pipe Capacity 2 .9437 cfs Design Vel 3 .2932 fps Travel Time: 0.80 min Pipe Full Vel 3 .8466 fps PIPE REACH ID No. P024 ' From•• To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 63 . 0000 ft s: 0. 0050 Up invert 16. 0800 ft down invert: 15. 7650 ft ' Collection Area: 0. 2260 Ac. Design Flow 0. 2309 cfs Dsgn Depth: 0.23 ft Pipe Capacity 0.9984 cfs Design Vel 2 . 2072 fps Travel Time: 0.48 min Pipe Full Vel 2 .9355 fps ' PIPE REACH ID No. P025 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 ' Pipe Length 139 . 0000 ft s: 0. 0050 Up invert 16.4600 ft down invert: 15.7650 ft Collection Area: 0.4270 Ac. Design Flow 0.4362 cfs Dsgn Depth: 0. 32 ft Pipe Capacity 0.9984 cfs Design Vel 2 . 6181 fps Travel Time: 0.88 min Pipe Full Vel 2 .9355 fps OUTFALL PIPE Worksheet for Circular Channel ' Project Description Project File d:\017c\006j\storm\project1.fm2 Worksheet OUTFALL PIPE ' Flow Element Circular Channel Method Manning's Formula Solve For Discharge Input Data ' Mannings Coefficient 0.012 Channel Slope 0.005000 ft/ft Depth 1.41 ft Diameter 1.50 ft ' Results Discharge 8.66 ft'/s Flow Area 1.72 ft2 ' Wetted Perimeter 3.97 ft Top Width 0.71 ft Critical Depth 1.14 ft ' Percent Full 94.00 % Critical Slope 0.006761 ft/ft Velocity 5.02 ft/s ' Velocity Head 0.39 ft Specific Energy 1.80 ft Froude Number 0.57 Maximum Discharge 8.66 ft'/s Full Flow Capacity 8.05 ft'/s Full Flow Slope 0.005785 ft/ft ' Flow is subcritical. ' Mar 5, 1999 Your Company FlowMaster v4.1 12:50:51 Haestad Methods, Inc. 37 Brookside Road Waterbury,CT 06708 (203)755-1666 Page 1 of 1 APPENDIX H ' Page 1 of 2 tKing County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET ' PROJECT• • • ' LOCATION• PROJECT t 0c,1<���atz 'e.,{ er- ProjectOwner NRer Inc. Project Name Location Address Township ' Phone Range Project Engineer Section Company Project Size AC Address Phone Upstream Drainage Basin Size AC • . PART 4 OTHER PERMITS ' - Subdivision = DOF/G HPA Shoreline Management 0 Rockery � Short Subdivision � COE 404' Structural Vaults C] Grading � DOE Dam Safety Q Commercial El FEMA Floodplain 0 Other � Other [] COE Wetlands HPA 1 ' Community �.o✓� ' Drainage Basin PART 6 SITE CHARACTERISTICS Floodplain ' River Wetlands 0 Stream 0 Wetlands [] Critical Stream Reach (� Seeps/Springs ' � Depress ions/Swales �] High Groundwater Table � Lake � Groundwater Recharge L� Steep Slopes — 0 Other Lakeside/Erosion Hazard SOILSPART 7 Soil Type Slopes Erosion Potential Erosive Velocities �,Ik IOC.m i [� Additional Sheets Attatched APPENDIX ' Page 2 of 2 King County Building and Land Development Division ' TECHNICAL INFORMATION REPORT (TIR) WORKSHEET PART 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT [] Ch.4-Downstream Analysis 40 P-1 Chen e. > � nc- nv 0 o — ' Additional Sheets Attatched PART 9 ESC REQUIREMENTS ' MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION FOLLOWING CONSTRUCTION Sedimentation Facilities 0 Stabilize Exposed Surface ' © Stabilized Construction Entrance EE Remove and Restore Temporary ESC Facilities F71 Perimeter Runoff Control 0 Clean and Remove All Silt and Debris Clearing and Grading Restrictions Ensure Operation of Permanent Facilities ' [ Cover Practices 0 Flag Limits of NGPES Construction Sequence Other 1 � Other t PART 10 SURFACE WATER SYSTEM ' Grass Lined Channel E:1 Tank = Infiltration Method of Analysis Depression Sbut4 �e 5 ® Pipe System = Vault 0 pr Open Channel F-1 Energy Dissapator = Flow Dispersal Compensation/Mitigation Wetland 0 Waiver of Eliminated Site Storage � Dry Pond ��,�� Wet Pond 0 Stream = Regional Detention Brief Description of System Operation ( a�c�. bns .s ire c� emu^ l Facility Related Site Limitations Additional Sheets Attatched ' Reference Facility Limitation PART 12 EASEMENTS/TRACTS PART11 STRUCTURAL ANALYSIS ' •' = Drainage Easement Cast in Place Vault Other F--j Access Easement Retaining Wall = Native Growth Protection Easement ' Rockery>4'High = Tract 0 Structural on Steep Slope [� Other PART 14 SIGNATURE OF - • • I or a civil engineer under my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and then attatchments. To the best of my knowledge the information provided here is accurate. 1/90