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HomeMy WebLinkAbout5149 .:.....:...::.;::... .... ..... :...:::.:::..:. . .. >::>::>::>::: ;:: .:: .. .. ................:::.::.::::.: :...>::::>::::>::: 1 ::::: :::: :: .>;:::;::;:>:::::>::;:;: ::: R ... ................ ... T1/VltC►ULA t C311tfCUN1'Ty FEB 2.0 �°� DEVELOP of RAT OUR JOB NO. 5149 CITY OCTOBER 12, 1994 PAP. Gift/ REVISED NOVEMBER 4, 1994 (TMN) Of WASH�� 9 r. o ir 23975 �441 Prepared By: ExriRES bra- 9 s BARGHAUSEN CONSULTING ENGINEERS, INC. 18215 72ND AVENUE SOUTH KENT, WASHINGTON 98032 (206) 251 -6222 GH'4 G m9 j"r ��2 T i CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES % Nor h <r�NGG`N gyp' TABLE OF CONTENTS 1. TECHNICAL INFORMATION REPORT WORKSHEET AND PROJECT NARRATIVE 2. DESCRIPTION OF EXISTING AND PROPOSED ON-SITE DRAINAGE FEATURES 3. ANALYSIS OF CORE REQUIREMENT NOS. 1 THROUGH 5 FROM KING COUNTY SURFACE WATER MANUAL 4. ANALYSIS OF SPECIAL REQUIREMENTS FROM KING COUNTY SURFACE WATER MANUAL 5. PRELIMINARY RETENTION AND WET POND SIZING CALCULATIONS Page 1 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT(TIR) WORKSHEET PROJECTPART 1 PROJECT OWNER AND PART 2 PROJECT LOCATION • Project Owner '�'� q% Ah r- _ _ Project Name CGe%- C- Mr-A Address ro. &*-- S806,0 Location Phone Township - Project Engineer Yq4 /��n-66 P� Range J� Company 4^4rew ,, 4Nt p-;,-. s Section le 9K ;e Project Size 133 'cc.• - AC i Address Phone /SL/S` 7 2vt'. J: kw�7� Upstream Drainage Basin Size Z ac.. AC 5/_"G 2ZL PART 3 TYPE OF APPLICATION PART 4 OTHER y Subdivision 0 DOF/G HPA Shoreline Management Short Subdivision COE 404 Rockery Grading DOE Dam Safe Structural Vaults Q Commercial in 0 FEMA Floodplain ED Other ; 0 Other COE Wetlands HPA COMMUNITYPART 5 SITE Community Drainage Basin PART 6 SITE _ , E] River E] Fioodplain 0 Stream E:] Wetlands F--1 Critical Stream Reach Seeps/Springs 0 Depressions/Swales Q High Groundwater Table I 0 Lake Groundwater Recharge 0 Steep Slopes C.ther Lakeside/Erosion Hazard SOILSPART 7 Soil TyDe Slopes Erosion Potential Erosive Velocities AJ w 11 Additional Sheets Attatched l� Page 2 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET, REFERENCE LIMITATION/SITE CONSTRAINT 0 Ch.4-Downstream Analysis 0 0 a 0 a _ Additional Sheets Attatched PART 9 ESC REOUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION FOLLOWING CONSTRUCTION bKP Sedimentation Facilities Stabilize Exposed Surface ® Stabilized Construction Entrance Remove and Restore Temporary ESC Facilities [Xr Perimeter Runoff Control Clean and Remove All Silt and Debris 0 Clearing and Grading Restrictions Ensure Operation of Permanent Facilities 0 Cover Practices 0 Flag Limits of NGPES Construction Sequence Other 0 Other Grass Lined Channel 0 Tank Infiltration Method of Analysis 1 Pipe System [:D Vault Depression S73 iUft/ Open Channel 0 Energy Dissapator =1 Flow Dispersal Compensation/Mitigation Dry Pond Wetland 0 Waiver of Eliminated Site Storage Wet Pond Stream 0 Regional Detention Brief Description of System Operation 5`�1'� water �sd�s� %�' 2' A 417k76,J, Facility Related Site Limitations 0 Additional Sheets Attatched Reference Facility Limitation PART I I STRUCTURAL ANALYSIS PART 12 EASEMENTS/TRACTS (May require special structural review) 0 Drainage Easement ED Cast in Place Vault 0 Other F-] Access Easement 0 Retaining Wall 0 Native Growth Protection Easement 0 Rockery>4'High 0 Tract 0 Structural on Steep Slope Other • - • • I or a civil engineer under my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the 7� attatchments. To the best of my knowledge the information provided here is accurate. slpn.cvD.r. 1/90 1. TECHNICAL INFORMATION REPORT WORKSHEET AND PROJECT NARRATIVE The proposed project is located on a 133-acre site in east Renton. While approximately 96 of the acres will be developed as a 400 site manufactured/modular home community, approximately 30 acres will remain native, and 7 acres located at the southwest corner of the site will be developed in the future as 20 single family homes in conjunction with the adjacent property to the west. Vehicular access will be via N.E. 3rd Street which runs along the northern boundary of the property. The site is a gravel pit which has been mined of most of the useful coarse gravel materials. The underlying foundation material is primarily sand which allows for good infiltration of surface water. Stormwater from the proposed paved surfaces and roofs will be controlled through the use of a series of retention/infiltration ponds. Stormwater will pass through three-cell wet ponds for water quality enhancement prior to discharge into the retention/infiltration ponds. Page 1 5149.002 [HPG/kr/sdcl 2. DESCRIPTION OF EXISTING AND PROPOSED ON-SITE DRAINAGE FEATURES There is a small upstream basin to the northeast of the proposed project site of approximately 17 acres. The stormwater from this site infiltrates into the ground. A majority of the stormwater from the project site also infiltrates into the ground. The remainder is conveyed, via manmade channels which were created during the previous gravel mining operation, to a water control structure. This structure is located approximately 500 feet south of the northwest corner of the site. Water from this structure flows through a 12-inch buried pipe to an open basin just outside the extreme northwest corner of the site. The water from this basin overflows into a 48-inch diameter corrugated metal pipe at roughly a 5 percent slope for a distance of approximately 113 feet. From that point, it discharges into a drainage channel traveling in a westerly direction. This drainage channel is extremely well defined, heavily vegetated, and the water travels approximately 300 feet where it discharges into an open pond approximately 100 feet by 50 feet. This pond is approximately 3 to 5 feet deep and is located along the south margin of N.E. 3rd Street, and east of Blaine Avenue N.E, near the entrance into the Mount Olivet Cemetery. From this pond, the water enters into a pipe system that runs along the southern margin of N.E. 3rd Street, and then travels westerly approximately 1,200 feet eventually discharging into a system near I-405. Along this course there are no noticeable erosion or flooding problems. The methodology in handling the developed stormwater from the pavement areas, as well as the roofs and yards, will utilize combination of wet ponds and retention/infiltration ponds. There are three facilities which are conceptually shown in the attached drainage map located within this drainage report. All of the surface water will be routed through a wet pond facility and then discharged directly into a retention/infiltration pond. Detailed subsurface soils investigation has been conducted, and the information has been incorporated in the design of the retention/infiltration ponds (see Geoengineers report, dated October 24, 1994). All of the pond facilities are designed in accordance with the King Page 2 5149.002 [HPG/kr/sdc] County Surface Water Design Manual. The infiltration ponds are sized to accommodate a 100-year storm event; in addition, an emergency overflow spillway is provided. One hundred percent (100%) of the stormwater is discharged via the infiltration ponds, and consequently, no storm related discharge is anticipated off site. The soils subsurface analysis shows that this water migrates to the west in the direction of the downstream system described above. If an emergency overflow ever occurs from the proposed system, the direction of the flow will also be to the west. Page 3 5149.002 [HPG/kr/sdc] 3. ANALYSIS OF CORE REQUIREMENT NOS. 1 THROUGH 5 FROM KING COUNTY SURFACE WATER MANUAL The following core requirements required by the King County Storm Water Manual will be met by the design of this system. These include the following: 1. Discharge at Natural Location. This project will discharge at its natural location via subsurface soils. The water quality enhancement/disposal facility utilizes biofiltration wet ponds and disposal by infiltration. This system will be designed by qualified hydrological and civil engineers. The system as designed will closely replicate the existing predevelopment conditions. 2. Off-Site Analysis. As stated in the project narrative, the downstream system from this project has been analyzed. In the event of any malfunction of the disposal facility, emergency overflow spillways will be designed in conformance with the King County manual and will discharge at the natural location. 3. Runoff Control. The retention/infiltration ponds and wet ponds sized for this project are in conformance with King County's manual. The preliminary calculations are enclosed within this report. 4. Conveyance System. All the conveyance systems to be constructed within this project will be designed in conformance with the King County Storm Manual. These will be designed to the 25-year storm event. A backwater pipe sizing analysis will be done as part of the final design for construction permits. Page 4 5149.002 [HPG/kr/sdc] 5. Erosion/Sedimentation Control Plan. A detailed erosion and sedimentation control plan is being submitted as part of the grading permit application. Page 5 5149.002 [HPG/kr/sdc] 4. ANALYSIS OF SPECIAL REQUIREMENTS The final design of this project will be in detailed compliance with all of the special requirements. The special requirements which might apply to this project include the following: • Special Requirement No. 2, Compliance with Existing Master Drainage Plan • Special Requirement No. 5, Special Water Quality Controls • Special Requirement No. 12, Soils Analysis and Report The above-mentioned special requirements will be further analyzed, if necessary, during the final design for construction permits. Analysis of these items has already been commenced for use in the preliminary design of the drainage facilities. Page 6 5149.002 [HPG/kr/sdcl 5. PRELIMINARY RETENTION AND WET POND SIZING CALCULATIONS The enclosed are calculations used for the sizing of the retention/infiltration ponds and wet pond facilities for this project. The biofiltration wet ponds proposed for this project will be used in lieu of biofiltration swales to provide better water quality control. The calculations showing the methodology, sizing and exact volume required for each of the ponds are enclosed within this report. Page 7 5149.002 [HPG/kr/sdc] Storm Detention Calculations Segale Mobile Home Park BCE Job#5149 T. Nelson 10-4-94 NORTH BASIN (Pond 1) Total Basin Area = 51.25 ac. = 205 DU/51.25 ac. = 4.0 DU/ac. = 42% impervious area Impervious Area = 21.53 ac Pervious Area = 29.72 ac. Existing Conditions: 51.25 ac. @ CN 68 SOUTH BASIN (Pond 3A and 3B w/overflow to Pond 2) Total Basin Area = 45.0 ac. Mobile Home Area = 208 DU /38 ac. = 5.5 DU/ac. = 50% impervious area Impervious Area = 19.0 ac. Pervious Area = 19.0 ac. Future Development Area = 7.0 ac. c@ 4.5 DU/ac. = 46% impervious area Impervious Area = 3.22 ac. Pervious Area = 3.78 ac. TOTALS Ex conditions: 45.0 ac @ CN 68 Proposed conditions: 22.22 ac. CN 98 22.78 ac. CN 68 POND DATA Infiltration Rate = 4 in/hr=0.00009259 ft/sec Pond Bottom Areas (so Discharge rate (ft/sec) 1 28,700 2.66 2B 3,250 0.30 3A + 3B 12,826 1.19 WET POND DATA Pond Impervious Area (so Wet Pond Area Req'd (so (1.0% of Impervious Area) 1 952,657 9,527 3 967,903 9,679 • og i rare �th - •� VIP �► _ • ate...,..- �� � _ %� Id `w � pow. �� �ILIlIIIIII��III�6.�,�,�� ii�l � h 11_ ( AMF Aggi�l ���� '"':� '� yak '7 � '• 0 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL -kBLE 3.5.2B SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type to rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY- HYDROLOGIC SOIL GROUP LAND USE DESCRIPTION A B C D Cultivated tand(1): winter condition 86 91 94 95 Mountain open areas: low growing brush and grasslands . 74 82 \•, 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed 42 64 76 61 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with cover crop 81 88 92 94 Open spaces. lawns. parks, golf courses, cemeteries, landscaping. good condition: grass cover on 75% or more of the area 80 8& 90 fair condition: grass cover on 50% 0 to 75%of the area 77 85 90 92 Gravel roads and parking lots 76 85 89 91 Dirt roads and parking lots 72 82 87 89 Impervious surfaces, pavement, roots, etc. 0,981198 98 98 Open water bodies: lakes,wetlands, ponds, etc. 1 100 100 100 Single Family Residential (2) Dwelling Unit/Gross Acre % Impervious (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 50 6.0 DU/GA 52 6.5 DU/GA 54 7.0 DU/GA S6 r Planned unit developments, % impervious condominiums, apartments, must be computed commercial business and industrial areas. (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9, August 1972. (2) Assumes root and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers 3.5.2-3 1/90 POND 1 11/ 4/94 Barghausen Engineers page 1 SEGALE MOBILE HOME PARK INFILTRATION POND 1 BCE #5149 ------------- BASIN SUMMARY BASIN ID: lA NAME: 100YR POSTDEV. RUNOFF SBUH METHODOLOGY TOTAL AREA. . . . . . . : 51. 25 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 29 .72 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 68. 00 TIME OF CONC. . . . . : 7. 23 min IMPERVIOUS AREA ABSTRACTION COEFF: 0. 20 AREA. . : 21.53 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 .00 s: 0. 0150 TcReach - Channel L: 1700. 00 kc:42 . 00 s: 0. 0150 PEAK RATE: 22 . 63 cfs VOL: 9 . 41 Ac-ft TIME: 480 min BASIN ID: 2A NAME: WET POND CALCULATION SBUH METHODOLOGY TOTAL AREA. . . . . . . : 51.25 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 0. 67 inches AREA. . : 29 . 72 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 68 . 00 TIME OF CONC. . . . . : 7. 23 min IMPERVIOUS AREA ABSTRACTION COEFF: 0. 20 AREA. . : 21.53 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0. 0150 TcReach - Channel L: 1700. 00 kc: 42 . 00 s: 0. 0150 PEAK RATE: 2 . 33 cfs VOL: 0.85 Ac-ft TIME: 480 min 11/ 4/94 Barghausen Engineers page 2 SEGALE MOBILE HOME PARK INFILTRATION POND 1 BCE #5149 -------------- HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf-AcFt Acres 1 22 . 631 480 409686 cf 51. 25 /00 y,- P-5+ y, 2 2 . 329 480 36909 cf 51.25 WJ P,,,,d C� I at" 3 2 . 307 1150 36232 cf 0. 00 Overf)ow PoAd 2- 4 22 . 631 480 459744 cf 51. 25 HIA. / S3 5 2 . 660 270 457231 cf 51.25 7r �v� o'oI►C- I-I� l �� D�TENTICW PoNJ SIZING % /UL 159^ TXF- Sl 41 G�LCV LAT►nn�5 o - 7 -9 4 ��►�N 0 Aj Po N r7 L AA?C4 (5�� VOA-UME (c-F) iEVOL 32 Z 8,-70O 35 35' 3�0 9G� o(o 96, oGo LU WWW ^CI w`� 7 __= 35 ) �3 ,7�f IA4n� Po„d 000 1 Sa, 18 8 ^as 30 �p�p � 3-7 27b IZ�B va Aevr cr a er o i l 11/ 4/94 Barghausen Engineers page 3 SEGALE MOBILE HOME PARK INFILTRATION POND 1 BCE #5149 ----------- STAGE STORAGE TABLE CUSTOM STORAGE ID No. 1 Description: RETENTION POND STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- ----------------------------- 32.00 0.0000 0.0000 34.80 89656 2.0582 37.60 252223 5.7902 40.40 420398 9.6510 32.20 6404 0.1470 35.00 96060 2.2052 37.80 264235 6.0660 40.60 432411 9.9268 32.40 12808 0.2940 35.20 108073 2.4810 38.00 276248 6.3418 40.80 444423 10.203 32.60 19212 0.4410 35.40 120085 2.7568 38.20 288261 6.6176 41.00 456436 10.478 32.80 25616 0.5881 35.60 132098 3.0325 38.40 300273 6.8933 41.20 468449 10.754 33.00 32020 0.7351 35.80 144110 3.3083 38.60 312286 7.1691 41.40 480461 11.030 33.20 38424 0.8821 36.00 156123 3.5841 38.80 324298 7.4449 41.60 492474 11.306 33.40 44828 1.0291 36.20 168135 3.8599 39.00 336311 7.7206 41.80 504486 11.581 33.60 51232 1.1761 36.40 180148 4.1356 39.20 348323 7.9964 42.00 516499 11.857 33.80 57636 1.3231 36.60 192160 4.4114 39.40 360336 8.2722 42.20 528511 12.133 34.00 64040 1.4702 36.80 204173 4.6872 39.60 372348 8.5479 42.40 540524 12.409 34.20 70444 1.6172 37.00 216185 4.9629 39.80 384361 8.8237 42.60 552536 12.684 34.40 76848 1.7642 37.20 228198 5.2387 40.00 396373 9.0995 42.80 564549 12.960 34.60 83252 1.9112 37.40 240210 5.5145 40.20 408386 9.3752 43.00 576561 13.236 11/ 4/94 Barghausen Engineers page 4 SEGALE MOBILE HOME PARK INFILTRATION POND 1 BCE #5149 STAGE DISCHARGE TABLE DISCHARGE LIST ID No. 1 Description: INFILTRATION POND STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---CfS-- ------- (ft) ---CfS-- ------- (ft) ---CfS-- 32.00 2.6600 34.80 2.6600 37.60 2.6600 40.40 2.6600 32.10 2.6600 34.90 2.6600 37.70 2.6600 40.50 2.6600 32.20 2.6600 35.00 2.6600 37.80 2.6600 40.60 2.6600 32.30 2.6600 35.10 2.6600 37.90 2.6600 40.70 2.6600 32.40 2.6600 35.20 2.6600 38.00 2.6600 40.80 2.6600 32.50 2.6600 35.30 2.6600 38.10 2.6600 40.90 2.6600 32.60 2.6600 35.40 2.6600 38.20 2.6600 41.00 2.6600 32.70 2.6600 35.50 2.6600 38.30 2.6600 41.10 2.6600 32.80 2.6600 35.60 2.6600 38.40 2.6600 41.20 2.6600 32.90 2.6600 35.70 2.6600 38.50 2.6600 41.30 2.6600 33.00 2.6600 35.80 2.6600 38.60 2.6600 41.40 2.6600 33.10 2.6600 35.90 2.6600 38.70 2.6600 41.50 2.6600 33.20 2.6600 36.00 2.6600 38.80 2.6600 41.60 2.6600 33.30 2.6600 36.10 2.6600 38.90 2.6600 41.70 2.6600 33.40 2.6600 36.20 2.6600 39.00 2.6600 41.80 2.6600 33.50 2.6600 36.30 2.6600 39.10 2.6600 41.90 2.6600 33.60 2.6600 36.40 2.6600 39.20 2.6600 42.00 2.6600 33.70 2.6600 36.50 2.6600 39.30 2.6600 42.10 2.6600 33.80 2.6600 36.60 2.6600 39.40 2.6600 42.20 2.6600 33.90 2.6600 36.70 2.6600 39.50 2.6600 42.30 2.6600 34.00 2.6600 36.80 2.6600 39.60 2.6600 42.40 2.6600 34.10 2.6600 36.90 2.6600 39.70 2.6600 42.50 2.6600 34.20 2.6600 37.00 2.6600 39.80 2.6600 42.60 2.6600 34.30 2.6600 37.10 2.6600 39.90 2.6600 42.70 2.6600 34.40 2.6600 37.20 2.6600 40.00 2.6600 42.80 2.6600 34.50 2.6600 37.30 2.6600 40.10 2.6600 42.90 2.6600 34.60 2.6600 37.40 2.6600 40.20 2.6600 43.00 2.6600 34.70 2.6600 37.50 2.6600 40.30 2.6600 43.00 2.6600 11/ 4/94 Barghausen Engineers page 5 SEGALE MOBILE HOME PARK INFILTRATION POND 1 BCE #5149 LEVEL POOL TABLE SUMMARY MATCH INFLOW -STO- -D1S- <-PEAK-> STORAGE <--------DESCRIPTION---------> (cfs) (cfs) --id- --id- <-STAGE> id VOL (cf) 100YR ROUTING ................ 3.34 22.63 1 1 37.46 5 243667 Je9aiZMob�lt /jo�°t�/�cril WF-T PoNP 5/Z/A/ 6 j. /Je_ 1so.- G SI LJq GAL CUI-A 71 OAJ S - - 1 4 P OIAJ j / vo) V^f- L EA ✓o LymE: (cF) coo N N N If00 �r PI a aver C/N M C1 cI N �a n e J� t POND 2 ll/ 4/94 Barghausen Engineers page 1 SEGALE MOBILE HOME PARK INFILTRATION POND 2 BCE JOB #5149 HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf-AcFt Acres 1 3 . 500 800 110193 cf 0. 00 ovgrr-/-- 3A 2 2 . 607 1150 90052 cf 0. 00 IOo yr /2akfri+ 3 0. 300 20 53820 cf 0. 00 4 2 . 307 1150 36232 cf 0. 00 1'0 P",Io( + IV-, /-tD"' IIL, tlor'c (ui►� PeT&4rloN paNt7 sIZ►NG 1, /JL�sor 13( �E- CALC.VL.4►ions to -Io -g4 P D nJ 0 2 3 B 31 L, 00 41 2-78 1 44 W W W xxx V1%n Nf 000 w20 �N c+a aaa evric+ N CIN �0 6 Q 1 i ll/ 4/94 Barghausen Engineers page 2 SEGALE MOBILE HOME PARK INFILTRATION POND 2 BCE JOB #5149 STAGE STORAGE TABLE CUSTOM STORAGE ID No. 1 Description: RETENTION POND STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- 38.00 0.0000 0.0000 39.60 13141 0.3017 41.20 26282 0.6033 42.80 39422 0.9050 38.20 1643 0.0377 39.80 14783 0.3394 41.40 27924 0.6411 43.00 41065 0.9427 38.40 3285 0.0754 40.00 16426 0.3771 41.60 29567 0.6788 43.20 42708 0.9804 38.60 4928 0.1131 40.20 18069 0.4148 41.80 31209 0.7165 43.40 44350 1.0181 38.80 6570 0.1508 40.40 19711 0.4525 42.00 32852 0.7542 43.60 45993 1.0558 39.00 8213 0.1885 40.60 21354 0.4902 42.20 34495 0.7919 43.80 47635 1.0936 39.20 9856 0.2263 40.80 22996 0.5279 42.40 36137 0.8296 44.00 49278 1.1313 39.40 11498 0.2640 41.00 24639 0.5656 42.60 37780 0.8673 11/ 4/94 Barghausen Engineers page 3 SEGALE MOBILE HOME PARK INFILTRATION POND 2 BCE JOB #5149 STAGE DISCHARGE TABLE DISCHARGE LIST ID No. 1 Description: INFILTRATION POND 2 STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE -DISCHARGE---> (ft) ---CfS-- ------- (ft) ---CfS-- ------- (ft) ---CfS-- ------- (ft) ---CfS-- ------- 38.00 0.3000 39.80 0.3000 41.60 0.3000 43.40 0.3000 38.10 0.3000 39.90 0.3000 41.70 0.3000 43.50 0.3000 38.20 0.3000 40.00 0.3000 41.80 0.3000 43.60 0.3000 38.30 0.3000 40.10 0.3000 41.90 0.3000 43.70 0.3000 38.40 0.3000 40.20 0.3000 42.00 0.3000 43.80 0.3000 38.50 0.3000 40.30 0.3000 42.10 0.3000 43.90 0.3000 38.60 0.3000 40.40 0.3000 42.20 0.3000 44.00 0.3000 38.70 0.3000 40.50 0.3000 42.30 0.3000 44.10 0.3000 38.80 0.3000 40.60 0.3000 42.40 0.3000 44.20 0.3000 38.90 0.3000 40.70 0.3000 42.50 0.3000 44.30 0.3000 39.00 0.3000 40.80 0.3000 42.60 0.3000 44.40 0.3000 39.10 0.3000 40.90 0.3000 42.70 0.3000 44.50 0.3000 39.20 0.3000 41.00 0.3000 42.80 0.3000 44.60 0.3000 39.30 0.3000 41.10 0.3000 42.90 0.3000 44.70 0.3000 39.40 0.3000 41.20 0.3000 43.00 0.3000 44.80 0.3000 39.50 0.3000 41.30 0.3000 43.10 0.3000 44.90 0.3000 39.60 0.3000 41.40 0.3000 43.20 0.3000 45.00 0.3000 39.70 0.3000 41.50 0.3000 43.30 0.3000 45.00 0.3000 11/ 4/94 Barghausen Engineers page 4 SEGALE MOBILE HOME PARK INFILTRATION POND 2 BCE JOB 15149 STAGE DISCHARGE TABLE RISER DISCHARGE ID No. 2 Description: RISER STRUCTURE Riser Diameter (in) : 18. 00 elev: 43 . 65 ft Weir Coefficient. . . : 3 . 782 height: 45.00 ft Orif Coefficient. . . : 9 .739 increm: 0. 10 ft STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE -DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---CfS-- ------- (ft) CfS-- (ft) ---Cfs- --- ------- ------------------------------- 43.65 0.0000 44.00 3.0249 44.40 7.3694 44.80 9.1254 43.70 0.1633 44.10 4.4099 44.50 7.8454 44.90 9.5139 43.80 0.8487 44.20 5.9587 44.60 8.2940 45.00 9.8871 43.90 1.8261 44.30 6.8606 44.70 8.7196 45.00 9.8871 ll/ 4/94 Barghausen Engineers page 5 SEGALE MOBILE HOME PARK INFILTRATION POND 2 BCE JOB #5149 STAGE DISCHARGE TABLE COMBINATION DISCHARGE ID No. 3 Description: COMBINATION 1 AND 2 Structure: 1 Structure: Structure: 2 Structure: Structure: STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---cfs-- ------- (ft) ---cfs-- ------- (ft) ---cfS-- ------- (ft) ---cfs-- ------- 38.00 0.3000 39.30 0.3000 40.60 0.3000 41.90 0.3000 38.10 0.3000 39.40 0.3000 40.70 0.3000 42.00 0.3000 38.20 0.3000 39.50 0.3000 40.80 0.3000 42.10 0.3000 38.30 0.3000 39.60 0.3000 40.90 0.3000 42.20 0.3000 38.40 0.3000 39.70 0.3000 41.00 0.3000 42.30 0.3000 38.50 0.3000 39.80 0.3000 41.10 0.3000 42.40 0.3000 38.60 0.3000 39.90 0.3000 41.20 0.3000 42.50 0.3000 38.70 0.3000 40.00 0.3000 41.30 0.3000 42.60 0.3000 38.80 0.3000 40.10 0.3000 41.40 0.3000 42.70 0.3000 38.90 0.3000 40.20 0.3000 41.50 0.3000 42.80 0.3000 39.00 0.3000 40.30 0.3000 41.60 0.3000 42.90 0.3000 39.10 0.3000 40.40 0.3000 41.70 0.3000 43.00 0.3000 39.20 0.3000 40.50 0.3000 41.80 0.3000 45.00 0.3000 11/ 4/94 Barghausen Engineers page 6 SEGALE MOBILE HOME PARK INFILTRATION POND 2 BCE JOB #5149 LEVEL POOL TABLE SUMMARY MATCH INFLOW -STO- -DIS- <-PEAK-> STORAGE <--------DESCRIPTION---------> (cfs) (cfs) --id- --id- <-STAGE> id VOL (cf) 100YR ROUTING ................ 0.30 3.50 1 3 43.94 2 48786.23 POND 3A+3B 10/10/94 Barghausen Engineers page 1 SEGALE MOBILE HOME PARK INFILTRATION POND 3A AND 3B (SOUTH BASIN) BCE JOB #5149 BASIN SUMMARY BASIN ID: 1A NAME: 100YR POSTDEV. RUNOFF (SOUTH) SBUH METHODOLOGY TOTAL AREA. . . . . . . : 45. 00 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 22 . 78 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 68 . 00 TIME OF CONC. . . . . : 7 . 63 min IMPERVIOUS AREA ABSTRACTION COEFF: 0. 20 AREA. . : 22 . 22 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0. 0100 TcReach - Channel L: 2000. 00 kc: 42 . 00 s: 0. 0200 PEAK RATE: 21. 87 cfs VOL: 8 . 96 Ac-ft TIME: 480 min BASIN ID: 2A NAME: WET POND CALCULATION SBUH METHODOLOGY TOTAL AREA. . . . . . . : 45. 00 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERVIOUS AREA PRECIPITATION. . . . : 0. 67 inches AREA. . : 22 . 78 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 68 . 00 TIME OF CONC. . . . . : 7 . 63 min IMPERVIOUS AREA ABSTRACTION COEFF: 0. 20 AREA. . : 22 . 22 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0. 0100 TcReach - Channel L: 2000. 00 kc:42 . 00 s: 0. 0200 PEAK RATE: 2 . 41 cfs VOL: 0. 88 Ac-ft TIME: 480 min 10/10/94 Barghausen Engineers page 2 SEGALE MOBILE HOME PARK INFILTRATION POND 3A AND 3B (SOUTH BASIN) BCE JOB #5149 HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf-AcFt Acres 1 21. 871 480 390092 cf 45. 00 00 IrI�oS� 2 2 . 408 480 38320 cf 45. 00 WJ- PW 3 4 . 749 800 323679 cf 45 . 00 joo I Rout;n� 4 1. 190 20 213486 cf 0 . 00 J7,-r; 14'ratio 2t3 5 3 . 500 800 110193 cf 0. 00 5 Ov2/ r�ow fo �a Jt�aI f- /rlani 1C r-Io-�t -rsE 1T/av PaND SIZING -T PIL�Sor� CALCVLATI /o -94 pETENToIJ PolVD it 3A + 3B EL A&OC-A VOLUMF— (crr) j VO 40 /z, 82G -13 I y /V 26 45, �1� �~� inGl• W�l __= q 3 Pond 3�,2g1 YI 1A%n 138� 282- 0or q S,/ 947 / 18 �aa ava N C C; CV CIN O \®a I I . 10/10/94 Barghausen Engineers page 3 SEGALE MOBILE HOME PARK INFILTRATION POND 3A AND 3B (SOUTH BASIN) BCE JOB #5149 STAGE STORAGE TABLE CUSTOM STORAGE ID No. 1 Description: INFILTRATION POND 3A + 3B STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- 40.00 0.0000 0.0000 41.80 27551 0.6325 43.60 66660 1.5303 45.40 128887 2.9588 40.20 3061 0.0703 42.00 30612 0.7028 43.80 73574 1.6890 45.60 135801 3.1176 40.40 6122 0.1406 42.20 33673 0.7730 44.00 80489 1.8478 45.80 142715 3.2763 40.60 9184 0.2108 42.40 36734 0.8433 44.20 87403 2.0065 46.00 149630 3.4350 40.80 12245 0.2811 42.60 39796 0.9136 44.40 94317 2.1652 46.20 156544 3.5937 41.00 15306 0.3514 42.80 42857 0.9839 44.60 101231 2.3239 46.40 163458 3.7525 41.20 18367 0.4217 43.00 45918 1.0541 44.80 108145 2.4827 46.60 170372 3.9112 41.40 21428 0.4919 43.20 52832 1.2129 45.00 115059 2.6414 46.80 177286 4.0699 41.60 24490 0.5622 43.40 59746 1.3716 45.20 121973 2.8001 47.00 184200 4.2287 10/10/94 Barghausen Engineers page 4 SEGALE MOBILE HOME PARK INFILTRATION POND 3A AND 3B (SOUTH BASIN) BCE JOB #5149 STAGE DISCHARGE TABLE DISCHARGE LIST ID No. 1 Description: INFILTRATION POND 3a + 3b STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---CfS-- ------- (ft) ---CfS-- ------- (ft) ---CfS-- ------- (ft) ---CfS-- ------- 40.00 1.1900 42.10 1.1900 44.20 1.1900 46.30 1.1900 40.10 1.1900 42.20 1.1900 44.30 1.1900 46.40 1.1900 40.20 1.1900 42.30 1.1900 44.40 1.1900 46.50 1.1900 40.30 1.1900 42.40 1.1900 44.50 1.1900 46.60 1.1900 40.40 1.1900 42.50 1.1900 44.60 1.1900 46.70 1.1900 40.50 1.1900 42.60 1.1900 44.70 1.1900 46.80 1.1900 40.60 1.1900 42.70 1.1900 44.80 1.1900 46.90 1.1900 40.70 1.1900 42.80 1.1900 44.90 1.1900 47.00 1.1900 40.80 1.1900 42.90 1.1900 45.00 1.1900 47.10 1.1900 40.90 1.1900 43.00 1.1900 45.10 1.1900 47.20 1.1900 41.00 1.1900 43.10 1.1900 45.20 1.1900 47.30 1.1900 41.10 1.1900 43.20 1.1900 45.30 1.1900 47.40 1.1900 41.20 1.1900 43.30 1.1900 45.40 1.1900 47.50 1.1900 41.30 1.1900 43.40 1.1900 45.50 1.1900 47.60 1.1900 41.40 1.1900 43.50 1.1900 45.60 1.1900 47.70 1.1900 41.50 1.1900 43.60 1.1900 45.70 1.1900 47.80 1.1900 41.60 1.1900 43.70 1.1900 45.80 1.1900 47.90 1.1900 41.70 1.1900 43.80 1.1900 45.90 1.1900 48.00 1.1900 41.80 1.1900 43.90 1.1900 46.00 1.1900 48.00 1.1900 41.90 1.1900 44.00 1.1900 46.10 1.1900 42.00 1.1900 44.10 1.1900 46.20 1.1900 10/10/94 Barghausen Engineers page 5 SEGALE MOBILE HOME PARK INFILTRATION POND 3A AND 3B (SOUTH BASIN) BCE JOB #5149 STAGE DISCHARGE TABLE RISER DISCHARGE ID No. 2 Description: RISER OVERFLOW Riser Diameter (in) : 24 . 00 elev: 46 . 65 ft Weir Coefficient. .. : 3 . 782 height: 48 . 00 ft Orif Coefficient. . . : 9 . 739 increm: 0 . 10 ft STAGE <--DISCHARGE---> STAGE —DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---cfs-- ------- (ft) ---cfs-- ------- (ft) ---cfs-- ------- (ft) ---cfs-- ------- --------------------- 46.65 0.0000 47.00 4.0332 47.40 12.651 47.80 16.223 46.70 0.2178 47.10 5.8798 47.50 13.947 47.90 16.914 46.80 1.1316 47.20 7.9449 47.60 14.745 48.00 17.577 46.90 2.4347 47.30 10.207 47.70 15.502 48.00 17.577 10/10/94 Barghausen Engineers page 6 SEGALE MOBILE HOME PARK INFILTRATION POND 3A AND 3B (SOUTH BASIN) BCE JOB #5149 ----------- STAGE DISCHARGE TABLE COMBINATION DISCHARGE ID No. 3 Description: COMBINATION 1 AND 2 Structure: 1 Structure: Structure: 2 Structure: Structure: STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---cfs-- ------- (ft) ---cfs-- ------- (ft) ---cfs-- ------ (ft) ---cfs-- ------- ------------------------------- 40.00 1.1900 42.10 1.1900 44.20 1.1900 46.30 1.1900 40.10 1.1900 42.20 1.1900 44.30 1.1900 46.40 1.1900 40.20 1.1900 42.30 1.1900 44.40 1.1900 46.50 1.1900 40.30 1.1900 42.40 1.1900 44.50 1.1900 46.60 1.1900 40.40 1.1900 42.50 1.1900 44.60 1.1900 46.70 1.4078 40.50 1.1900 42.60 1.1900 44.70 1.1900 46.80 2.3216 40.60 1.1900 42.70 1.1900 44.80 1.1900 46.90 3.6247 40.70 1.1900 42.80 1.1900 44.90 1.1900 47.00 5.2232 40.80 1.1900 42.90 1.1900 45.00 1.1900 47.10 7.0698 40.90 1.1900 43.00 1.1900 45.10 1.1900 47.20 9.1349 41.00 1.1900 43.10 1.1900 45.20 1.1900 47.30 11.397 41.10 1.1900 43.20 1.1900 45.30 1.1900 47.40 13.841 41.20 1.1900 43.30 1.1900 45.40 1.1900 47.50 15.137 41.30 1.1900 43.40 1.1900 45.50 1.1900 47.60 15.935 41.40 1.1900 43.50 1.1900 45.60 1.1900 47.70 16.692 41.50 1.1900 43.60 1.1900 45.70 1.1900 47.80 17.413 41.60 1.1900 43.70 1.1900 45.80 1.1900 47.90 18.104 41.70 1.1900 43.80 1.1900 45.90 1.1900 48.00 18.767 41.80 1.1900 43.90 1.1900 46.00 1.1900 41.90 1.1900 44.00 1.1900 46.10 1.1900 42.00 1.1900 44.10 1.1900 46.20 1.1900 10/10/94 Barghausen Engineers page 7 SEGALE MOBILE HOME PARK INFILTRATION POND 3A AND 3B (SOUTH BASIN) BCE JOB #5149 LEVEL POOL TABLE SUMMARY MATCH INFLOW -STO- -DIS- <-PEAK-> STORAGE <--------DESCRIPTION---------> (cfs) (cfs) --id- --id- <-STAGE> id VOL (cf) 100 YR ROUTING ............... 1.19 21.87 1 3 46.97 3 183174 /VI 14r, t"(eti[, �w/I� WrT PDND S/ZINC T AlG/So'1 CAL COLA rloAJs two�l a P 9A 4 3 e VA I,4 ,1-c ro-td. = 381320 of �S�e. klyd. 2) L A/Z EA �s{� V O w.14 C (c� N N N H F F 40 /221-5 , 2�5 41 "'� 43 17, 285 aaa C/M!V N N N 0 P I I I r 9 I i i i t I �g �; � •' � a .• � �� y ' A�<S ��InAIN i'r`SI ��:.. w �'#; J IIL 2HIf _..J . r��e Ii roam ....--'s \�.r• �� � � r, � - - ')UNION t� S �- lis N �Q /Eca1R a tttJJJ ///tt/ r _ 2Nb Si y r JC t'\ C� Ro S r I S 3 < 5 � PARK r Aril \ ,_... 1 �. $ ,sa s(94'{ � 3j :,.. ...� '� .rY -•? �' ,,,,, \i yu, ..,9 �' ,�sy" �`( - ® (r - RrH\ .rr:s.w t Hp� 'r-i.::` ra'.y •" 11 .#.? {� > £. if,r_-�.,... 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