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HomeMy WebLinkAboutSWP272236(2) c�V j V E® C G p1VlS10N 8�1�p�N BONNELL PROPERTY PROPOSED RETAIL Renton, Washington Stormwater Management Report January 29, 1996 'j p 67CPi r c Prepared By: Washington Land Design 10700 Meridian Avenue N, Suite 503 Seattle, WA 98133 (206) 365-9510 FAX: (206) 365-0225 Pagc 1 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET PART I PROJECT OWNER AND PART 2 PROJECT LOCATION PROJECT ENGINEER AND DESCRIPTION ProjectOwner F alk :-o�4*lF c-- Project Name Address lq6 a>✓ _.�F 7TH BCt,L r Vl1L _ Location Phone f S4- 9 2-�Z - _-_ Township Project Engineer =ct GE r v_E rr Range - -- Company WASH Section r� ro �q.p ,�E -- — — /2e6 Project Size �9. AC _ Address Phone 6S S_-_.______- Upstream Drainage Basin Size _-_ AC IJ Subdivision DOF/GHPA J Shc:eSneManagement ^ Short SubdivisionI COE 404 Rca<ery ,n Grading — DOE Dam Safety = Structural Vaults ��Cemmercial FEMAFloodplain J Other Other — -`- COE Wetlands ---- .- HPA -- Community Drainage Basin - — -- River Flcodp:ain - - Stream -- -- -- — Wetlands — -- - _- Cr!,cal Stream Reac Sroas S Js r r, :nl r'E3Si0'>iSh2 e> •-i.gll G,o ndwaler Ia--ie Lake _ _-_ _ _ Grc..r,c.•:ater Recharge Steep Slopes Other _ -. Lakeside/Erosion Ha=d -i rf- So:! S'c;Fs EresionPoienual E ro sive Veloc lies l � Additional Sheets Attatched Irf' I Page 2 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET t PARTS DEVELOPMENT LIMITATIONS REFERENCE I IMITATION/SITE CONSTRAINT 4-Downstream Analysis- -L o ------ ----- - Additional Sheets Atiatched 7Cover ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS ONSTRUCTION FOLLOWING CONSTRUCTION tion Facilities Stabilize Exposed Surface Construction Enhance Remove and Restore Temporary ESC Facilities Runoff Control ,[ Clean and Remove All Silt and Debris nd Grading Restrictions Ensure Operation of Permanent Facilities ctices (] Flag Limits of NGPES Construction Sequence Other Other Grass Lined Channel Tank = Infiltration Method of Analysis Pipe System a Vault n Depression UGH yD Open Channel Energy DSsapator = Flow Dispersal Compensaticn/Mitgat:on Dry Pond Wetland = Waiver of Eliminated Site Storage 0 Wet Pond �. Stream 0 Regional Detention Brief Description ofSys'emOperation _ Uzi , p tpE Q EK/TlorJ ✓ALE GTE t. 2�P_,. ''. Yr - � .•. � _ A 1- ' F c } Re'ated S Li m^s a: —Addtional Sr E.s [� Drainage Easement Cast in Place Vaal; i Other I--] Access Easement ED Retaining Wall Native Growth Protection Easement r—) Rookery>4'High i- 1 Tract %._) Structural on Stccp Slope I I Olher PART 14 SIGNATURE OF PROFESSIONAL ENIGINEER I or a civil engineer under my supervision have visited the site. Actual site conditions as observed were incorporated into this worflsheel and th attalchments. To the best or my knowledge the Information provided here is accurate. syoror• i Construction Description: This project proposes to demolish an existing vacant retail store and grocery store (approximately 101,000 square feet) and construct a new shopping center (approximately 133,300 square feet). The project also includes pads for future development of two other retail buildings (approximately 26,000 and 4,000 square feet). Much of the existing on-site infrastructure will be utilized for the new development. Portions of the existing water lines, sanitary sewer system, and pavement are among the items identified to remain. Additional pavement and storm drainage systems to the west of the proposed building will be constructed to accommodate the increased size of the retail development. Proposed construction includes construction of the following elements: • Storm drainage detention pipe • Earthwork to adjust grades on west portion of site • Water Quality Swale • Utilities for building (water, sanitary sewer, gas, power, telephone) • Stormwater conveyance system consisting of catch basins and buried pipe • Asphalt pavement including overlay of existing pavement to remain Existing On-site Drainage Features: The existing site is approximately 75% developed with pavement and buildings. These improvements drain to a series of catch basins and underground pipe discharging to a city storm drain system in 7th Street SW. The on-site drainage area is bounded to the east by Hardie Avenue, to the West by an exiting commercial development, to the South by the Renton Honda property line, and to the north by 7th Street SW. A fast food restaurant (Burger King) at the northeast corner of the site and a Tire & Gas station at the southeast corner of the site drain to a storm drainage system located in Hardie Avenue. Other areas within the confines described above contribute to the on-site storm drainage system. Proposed On-site Drainage Features: The development proposes to construct a new storm drainage system to collect surface water run-off and detain increased run-off associated with the increased impervious areas on-site. Run-off from the increase in impervious surface area subject to vehicular traffic will be treated through a biofiltration swale designed in accordance with King County Surface Water Design Manual. The run-off from the existing parking lot will also be routed through the biofiltration swale for water quality enhancement. The project proposes to utilize underground corrugated metal pipe for detention storage. Storm drain pipe will be smooth walled corrugated plastic pipe or reinforced concrete pipe with a Manning roughness coefficient of n-0.012. Catch basins will have a sump at the base to collect silts. o P crs- S��SE el :604-I3 ✓� 1, `yI i 4SH F. sv a , — 7-3 sr a i.- s a-s t0)x S� t£� aoe b \ � . . . _ ... _ . . . �_. :. �'L rNGT�y ace-• u.ca-o Ib.:=-> �s-, NORrHRN ,a-e� Qygd• ad'7z��ob ,�ME -t M 1� 0 ,,A%ft a,7�r�a7 . �tf �, ':sal �.�,� ►, ,1 :e.:, 7TH 16.:5-e :c.0e-5 ,6cJ ta.x-a b: tart-s $W 7TH ��LL I z¢rz-z 7.212T °r am �1��e H vs i ..J� Q' sJ� 3 1 �� / j/ -z � a n •\ lafiy C.:. • r zao u! Ole °�y¢ i 8� J. .sod b-+3 ►£,a7 5319 NW 1/4 16 1 LO j, V W t .cre,wn�T PLANT I 1 fl __ ~ c? �`+ Core and Special Requirements: King County Surface Water Design Manual Core requirements 1-5 have been addressed as follows: Core Requirement Proposed Compliance 1- Discharge at the natural location The project proposes to discharge at the existing city storm system in 7th Street SW. 2-Off-site analysis This report includes a Level 1 downstream analysis. 3- Runoff control Project proposes to match the existing peak discharge rate of release for the 2 and 10 year storm event. Buried pipe detention is utilized to achieve peak run-off control. Biofiltration is provided for water quality treatment of the 6- month storm event. 4- Conveyance system On-site storm system is designed to convey the 25-year storm event. 5-Temporary Erosion Control An erosion control plan and narrative will be provided to minimize the impacts of construction activities on storm water run-off. A brief narrative of some erosion control measures likely to be utilized are included in the attached narrative. Special Requirement Proposed Compliance 1-Critical Drainage Area City stated the final discharge point for the city storm drainage system is to the P-1 Forebay which is a natural area and subject to the City of Renton Critical Drainage requirements. Discharge to this location will meet requirements of the City requirements. Detention Calculation: On-site detention is provided in accordance with King County Surface Water Design Manual Core Requirement #3. This requires that the peak rate of run-off for the site match the existing peak run- off for the 2 and 10 year storm. Conveyance of the post developed 100 year storm event is also required. "Existing Condition" refers to the current site condition as the on-site development contains an approved existing on-site storm drainage system. The Santa Barbara Urban Hydrograph/ Soil Conservation Service (SBUH) hydrograph methodology is used to compute on-site detention. The SBUH software provided by King County is utilized to model rainfall events for the 2, 10 and 100 year 24 hour design storms for existing and proposed conditions. The attached appendix illustrates calculations for the inputs for the SBUH model. The following table summarizes the data used as inputs for the model: Existing Proposed Design Rainfall Pervious Curve Impervious Curve Time of Pervious Curve Impervious Curve Time of Storm (in.) Area(AC) Number Area(AC) Number Conc.(min) Area(AC1 Number Area(AC) Number Conc.(min) 2-yr 2.0 10-yr 2.9 3.91 89 15.50 98 9.0 1 86 18.41 98 11.4 25•yr 3.4 100-yr 3.9 The attached hydrographs model the rainfall events for the design storm events. The following summarizes the peak rates associated with the models: Design Storm: Existing Peak Rate Existing Total Run- Developed Peak Proposed Peak Proposed Tot (cfs) off (c9 Rate w/o Rate with Run-off(cf) Detention (cfs) Detention 2-yr 8.09 114384 8.36 8.09 121563 10-yr 12.37 175780 12.52 12.37 183.939 25-yr 14.76 210257 14.81 14.76 218762 100-yr 17.14 244889 17.11 17.11 253674 Based on this analysis, and the RDFAC buried pipe detention sizing routine outlined by KCSWM, the preliminary sizing of the detention tank is as follows: Pipe Diameter: 4 Feet 10 Year Detention Volume: 2380 cubic feet (1700 cf increased by 40%) Pipe Length: 190 Feet Orifice Diameter: 0.090 feet (i inch) Biofiltration Design Calculations: The proposed biofiltration swale is located at the northwest corner of the site. The swale is 200 feet long, as required by KCSWM, and has a slope of 1.5%. In accordance with 1990 KCSWM Core requirement #3, the design flow rate for biofiltration is equal to the 6-month, 24 hour peak discharge rate. This rate is estimated at 0.64 times the 2 year, 24 hour discharge rate. The peak rate of run-off associated with the area of the site to be treated is 1.5 cfs for the 6-month design storm as outlined by the 1990 KCSWM. Length Depth Slope Manning W Design Flow 200 feet 0.25 feet 0.02 ft/ft 0.35 1.5 cfs Based on this data, a width is established utilizing Manning's equation (see appendix notes for calculation). The swale width is 25.9 feet. Since roof drainage is not subject to vehicular traffic and is regarded to generally be clean, flows from the roof run-off will by-pass the biofiltration swale in order to provide more effective treatment to water subject to vehicular traffic. Conveyance Velocity Calculations: The main on-site storm system has a slope of approximately 0.5 %. Calculations based on Manning's equation indicates a velocity of approximately 4.0 fps for a flow rate of 2.44 cfs (see appendix calculations). Conveyance Capacity Calculations: Pipes have been sized to convey the 25 year design storm for their respective catchment areas. Refer to the Conveyance Calculations section of this report. Level l Downstream Analysis: On-site run-off discharges to a 36' public storm drain in 7th Street SW which increases to 54' diameter approximately 221 feet downstream along 7th. This trunk line increases to 60, diameter approximately 308 feet further to the west where it remains at this diameter to the discharge point at the P-1 Forebay. The P-1 Forebay collects run-off from drainage basins to the south and east of the bay, which includes the proposed development. One of the main collector trunk lines is located within 7th Street adjacent to the project site. The City of Renton indicated no problem areas downstream of the proposed development. There is a problem area near the site to the southeast of the project site, but in a different drainage basin. This project would have no contributing impact on the existing problem. A map of the City storm drainage system is attached. Stormwater Runoff Hydrographs Existing: 2 Year Storm Event 10 Year Storm Event 25 Year Storm Event 100 Year Storm Event Proposed: 2 Year Storm Event 10 Year Storm Event 25 Year Storm Event 100 Year Storm Event Discharge Rate(c/s) � - O Q 1 2 3 4 5 6 7 12 x, e 13 N 14 N 15 m m 16 17 - t a 16 o i 19 y 21 Z 22 I w m 23 - X 24 25 _. I d n i 1 6 r RN10EX Existing 10 Year Hydrograph 13 i 12 I 10 N C I � V " i —� —Discharge Rate rs V p O i a Tme(hours) Iwo I do AN i Discharge Rate(cls) 0 j 1 2 3 4 6 7 8 9 10 m � n y 12 c 13 n N N 14 N 15 _ m d 16 = ,C 18LO 0 19 m v 20 21 nZi 22 cn ' m 23 �'� X 24 III 25 I I I N J n A i o RN100EX I Existing 100 Year Hydrograph 14 r ,F Ir N V d r r� —Discharge Rate(cfs) as 3 r � c 4 y p O - .r..rV rr • W)v b!n r ¢i .^Oi �.�i- u^ M� m 0 Ca t�1' vW Time(hours) i i i i Discharge Rate(cfs) j D o n w A fn Or Oo b 2 i 3 4 $ 6 7 8 10 -qqI 11 b O 12 0 O 0 73 N 14 a 16 W 17 a 16 O 19 20 21 - A Z 22 ro 23 A 24 _ 25 li I ) I _o n i � ry n w RN10PR Proposed 10 Year Hydrograph 12 10 i 8 m —D'scharge Rate J f 2 0 � — — -N O� — -N A�- � - �- N N N N N N lr a(hours) ' i RN25PR Proposed 25 Year Hydrograph ' 15 14 12 j 10 a r T _ C 8 a --❑:scharge Sate V E r m o N 17 a in co n m rn o N m Time(hours( �r RN100PR Proposed 100 Year Hydrograph 16 i 16 1 14 12 y m 10 —Discharge Rate a -- 7-7 in a N_ 5 r 4 2 O Time (hours) Washington Land Design Planning • Fngineering Project: +-JTOI-� t'Y+�>v E c- • Date: IO�IB�I Description: +2Arti7 FhL-c_ 1/4T-EI-�,, ry ' r20MA K LS- ti- Al to- Y Z . 9 loo- `• ` 3 9 � < LTrtiJif� : /'�q eS i PPo��p y,�NpS: •tr,� � d'j �P +4 CA �X'STrrJCs XISTI 1..�� \/.!S U NZ (O.Olt ✓ f(oo )— = -Z wf.0 IZCC> L F V/ 6.41T 1. v Fe r Zc� '* t5 MtN PICrOr. -ro 2;✓,•J -OFF . c 9 , 0 MrN 10700 Meridian Avenue North, Suite 503, Seattle, Washington 98133 (206) 365-9510 fax: (206) 365-0225 Washington Land Design Planning • Engineering Project: ge!-+rp j - golJkJ E c-- c_ Date: Description: cJD l%AeLG _ B�' �U 14C0 L-F = Z. 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Washington Land Design page 1 renton --------------------------------------------------------------------- ------------------------------------------------------------ BASIN SUMMARY BASIN ID: pipel NAME : dev 25-year storm basin SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 27 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 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 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc:42 . 00 s : 0 . 0046 PEAK RATE: 0 . 19 cfs VOL: 0 . 07 Ac-ft TIME: 480 min BASIN ID: pipe10 NAME : dev 25-year, CA=2 . 56 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 84 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 2 . 84 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 7 . 35 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 1 . 99 cfs VOL: 0 . 75 Ac-ft TIME: 480 min BASIN ID: pipell NAME: dev 25-year, CA=6 . 14 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 6 . 82 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 6 . 82 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 9 . 20 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 4 . 70 cfs VOL: 1 . 80 Ac-ft TIME : 480 min Washington Land Design page 2 renton --------------------------------------------------------------------- ------------------------------------------------- BASIN SUMMARY BASIN ID: pipe12 NAME: dev 25-year, CA=6 . 34 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 04 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 7 . 04 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 10 . 20 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc:42 . 00 s : 0 . 0046 PEAK RATE: 4 . 80 cfs VOL : 1 . 86 Ac-ft TIME : 480 min BASIN ID: pipe13 NAME : dev 25-year, CA=6 . 44 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 16 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 7 . 16 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 10 . 70 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L : 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 4 . 85 cfs VOL: 1 . 89 Ac-ft TIME: 480 min BASIN ID: pipe14 NAME : dev 25-year, CA=0 . 144 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 16 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 16 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 11 cfs VOL: 0 . 04 Ac-ft TIME : 480 min Washington Land Design page 3 renton --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe15 NAME: dev 25-year, CA=0 . 216 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 24 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 0 . 24 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 30 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 17 cfs VOL: 0 . 06 Ac-ft TIME : 480 min BASIN ID: pipe16 NAME: dev 25-year, CA=0 . 316 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 35 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 0 . 35 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 50 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L : 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L:1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 25 cfs VOL: 0 . 09 Ac-ft TIME : 480 min BASIN ID: pipe17 NAME: dev 25-year, CA=0 . 10 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 11 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 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 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 08 cfs VOL: 0 . 03 Ac-ft TIME: 480 min Washington Land Design page 4 renton --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe18 NAME: dev 25-year, CA=7 . 09 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 88 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 7 . 88 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 11 . 50 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 0.0 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 5 . 29 cfs VOL: 2 . 08 Ac-ft TIME: 480 min BASIN ID : pipe19 NAME : dev 25-year, CA=0 . 12 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 13 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 13 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 0 . 09 cfs VOL: 0 . 03 Ac-ft TIME : 480 min BASIN ID : pipe2 NAME: dev 25-year, CA=0 . 42 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 .47 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 47 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 80 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L : 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE : 0 . 33 cfs VOL: 0 . 12 Ac-ft TIME: 480 min Washington Land Design page 5 renton --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe20 NAME: dev 25-year, CA=0 . 25 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 28 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 28 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 20 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L : 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 0 . 20 cfs VOL: 0 . 07 Ac-ft TIME: 480 min BASIN ID : pipe2l NAME : dev 25-year, CA=11 . 50 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 12 . 78 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 12 . 78 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 14 . 80 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 8 . 25 cfs VOL: 3 . 37 Ac-ft TIME: 480 min BASIN ID: pipe22 NAME : dev 25-year, CA=8 . 74 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 9 . 71 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 9 . 71 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 14 . 80 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE: 6 . 27 cfs VOL : 2 . 56 Ac-ft TIME : 480 min Washington Land Design page 6 renton --------------------------------------------------------------------- -------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe23 NAME : dev 25-year, CA=2 . 76 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 3 . 07 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 3 . 07 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 70 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 2 . 17 cfs VOL: 0 . 81 Ac-ft TIME : 480 min BASIN ID: pipe24 NAME : dev 25-year, CA=2 . 76 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 3 . 07 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 3 . 07 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 2 . 17 cfs VOL: 0 . 81 Ac-ft TIME : 480 min BASIN ID : pipe27 NAME : dev 25-year, CA=8 . 60 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 9 . 56 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 9 . 56 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 11 . 80 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE: 6 .40 cfs VOL: 2 . 52 Ac-ft TIME: 480 min Washington Land Design page 7 renton ------------ --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe28 NAME : dev 25-year, CA=1 . 51 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 68 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 1 . 68 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 9 . 60 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 1 . 15 cfs VOL: 0 .44 Ac-ft TIME : 480 min BASIN I➢: pipe29 NAME : dev 25-year, CA=2 . 66 from detn SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 96 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 2 . 96 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 2 . 09 cfs VOL: 0 . 78 Ac-ft TIME : 480 min BASIN ID: pipe3 NAME : dev 25-year, CA=0 . 6 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 83 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 83 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 50 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L : 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE : 0 . 59 cfs VOL: 0 . 22 Ac-ft TIME : 480 min Washington Land Design page 8 renton ------------------ ------------------------------------------------------------------ BASIN SUMMARY BASIN ID: pipe30 NAME: dev 25-year, CA=0 . 018 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 02 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 02 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC . . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 0 . 01 cfs VOL: 0 . 01 Ac-ft TIME : 480 min BASIN ID: pipe3l NAME: dev 25-year, CA=1 . 37 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 52 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 1 . 52 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 8 . 80 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 1 . 05 cfs VOL: 0 . 40 Ac-ft TIME: 480 min BASIN ID: pipe32 NAME : dev 25-year, CA=1 . 26 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 .40 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 1 .40 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 8 . 00 min ABSTRACTION COEFF : 0 .20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE : 0 . 98 cfs VOL: 0 . 37 Ac-ft TIME: 480 min Washington Land Design page 9 renton ---------------------------------------------------- - BASIN SUMMARY BASIN ID: pipe33 NAME : dev 25-year, CA=1 . 14 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 .27 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 1 . 27 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . . 0 . 00 min 7 . 20 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 0 . 89 cfs VOL: 0 . 34 Ac-ft TIME: 480 min BASIN ID : pipe34 NAME: dev 25-year, CA=1 . 02 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 13 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 1 . 13 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 6 . 60 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 80 cfs VOL: 0 . 30 Ac-ft TIME : 480 min BASIN ID: pipe35 NAME : dev 25-year, CA=0 . 72 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 80 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 0 . 80 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 6 . 20 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 0 . 56 cfs VOL: 0 . 21 Ac-ft TIME: 480 min ♦ Washington Land Design page 10 renton --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe36 NAME : dev 25-year, CA=0 . 65 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 72 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 72 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 6 . 10 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE: 0 . 51 cfs VOL: 0 . 19 Ac-ft TIME : 480 min BASIN ID: pipe37 NAME : dev 25-year, CA=0 . 59 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 90 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 90 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 0 . 00 TC. . . . : 5 . 00 min 0 . 00 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns ; 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE: 0 .41 cfs VOL: 0 . 15 Ac-ft TIME : 480 min BASIN ID: pipe38 NAME : dev 25-year, CA=2 . 66 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 96 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 2 . 96 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE: 2 . 09 cfs VOL : 0 . 78 Ac-ft TIME : 480 min • Washington Land Design page 11 renton --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe39 NAME: dev 25-year, CA=1 . 31 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 .46 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 1 . 46 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE: 1 . 03 cfs VOL: 0 . 39 Ac-ft TIME : 480 min BASIN ID: pipe4 NAME : dev 25-year, CA=0 . 15 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 17 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 17 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF : 0 .20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE: 0 . 12 cfs VOL: 0 . 04 Ac-ft TIME : 480 min BASIN ID: pipe40 NAME : dev 25-year, CA=0 . 2 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 22 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 22 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 6 . 00 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L : 200 . 00 ns : 0 .4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 16 cfs VOL : 0 . 06 Ac-ft TIME : 480 min Washington Land Design page 12 renton ------------------------------------------------------- - BASIN SUMMARY BASIN ID: pipe4l NAME : dev 25-year, CA=0 . 14 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 16 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 16 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 50 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 0 . 11 cfs VOL : 0 . 04 Ac-ft TIME : 480 min BASIN ID: pipe42 NAME : dev 25-year, CA=0 . 063 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 07 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 07 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 05 cfs VOL : 0 . 02 Ac-ft TIME : 480 min BASIN ID: pipe43 NAME : dev 25-year, CA=11 . 50 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 12 . 78 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 12 . 78 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 15 . 20 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L : 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L : 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 8 . 21 cfs VOL : 3 . 37 Ac-ft TIME: 480 min Washington Land Design page 13 renton --------------------------- --------------------------------- -- -- BASIN SUMMARY BASIN ID : pipe44 NAME: dev 25-year, CA=0 . 045 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 05 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 0 . 05 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 04 cfs VOL: 0 . 01 Ac-ft TIME: 480 min BASIN ID: pipe49 NAME : dev 25-year, CA=0 . 072 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 08 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 08 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . . 0 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 06 cfs VOL: 0 . 02 Ac-ft TIME: 480 min BASIN ID: pipes NAME: dev 25-year, CA=2 . 42 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 67 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 2 . 67 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 7 . 00 min ABSTRACTION COEFF : 0 .20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 1 . 87 cfs VOL: 0 . 70 Ac-ft TIME: 480 min Washington Land Design page 14 renton --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: pipe50 NAME : dev 25-year, CA=0 . 072 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 08 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 08 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 00 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L : 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE : 0 . 06 cfs VOL: 0 . 02 Ac-ft TIME: 480 min BASIN ID: pipe6 NAME : dev 25-year, CA=2 . 86 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 3 . 18 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 3 . 18 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 8 . 20 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 2 . 21 cfs VOL: 0 . 84 Ac-ft TIME : 480 min BASIN ID: pipe7 NAME : dev 25-year, CA=0 . 31 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 34 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 40 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 TcReach - Sheet L: 200 . 00 ns : 0 . 4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L : 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L : 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE : 0 . 24 cfs VOL: 0 . 09 Ac-ft TIME : 480 min r Washington Land Design page 15 renton ---------------------------------------------------- BASIN SUMMARY BASIN ID: pipe8 NAME : dev 25-year, CA=0 . 81 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 90 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0 . 00 Acres 0 . 90 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 60 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE: 0 . 64 cfs VOL: 0 . 24 Ac-ft TIME: 480 min BASIN ID: pipe9 NAME: dev 25-year, CA=1 . 56 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 73 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 1 . 73 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 6 . 35 min ABSTRACTION COEFF : 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc : 42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc : 42 . 00 s : 0 . 0046 PEAK RATE : 1 . 22 cfs VOL: 0 . 46 Ac-ft TIME : 480 min BASIN ID: stub NAME: dev 25-year, CA=0 . 34 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 38 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0 . 00 Acres 0 . 38 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 0 . 00 98 . 00 TC. . . . : 0 . 00 min 5 . 70 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 200 . 00 ns : 0 .4000 p2yr : 2 . 00 s : 0 . 0125 impTcReach - Channel L: 210 . 00 kc :42 . 00 s : 0 . 0043 impTcReach - Channel L: 1110 . 00 kc :42 . 00 s : 0 . 0046 PEAK RATE : 0 . 27 cfs VOL: 0 . 10 Ac-ft TIME : 480 min