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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 100-yr Rainfall=5.22" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 86 Summary for Pond CH-1: Chambers Inflow Area = 2.286 ac, 90.30% Impervious, Inflow Depth = 4.81" for 100-yr event Inflow = 14.93 cfs @ 12.04 hrs, Volume= 0.916 af Outflow = 2.37 cfs @ 12.58 hrs, Volume= 0.869 af, Atten= 84%, Lag= 32.5 min Primary = 2.37 cfs @ 12.58 hrs, Volume= 0.869 af Routed to Reach DP-1 : Design Point Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 595.88' @ 12.58 hrs Surf.Area= 6,598 sf Storage= 22,228 cf Flood Elev= 598.32' Surf.Area= 13,198 sf Storage= 26,499 cf Plug-Flow detention time= 299.4 min calculated for 0.869 af (95% of inflow) Center-of-Mass det. time= 269.4 min ( 1,025.7 - 756.3 ) Volume Invert Avail.Storage Storage Description #1A 590.50' 9,166 cf 44.25'W x 149.10'L x 5.50'H Field A 36,287 cf Overall - 13,373 cf Embedded = 22,914 cf x 40.0% Voids #2A 591.25' 13,373 cf ADS_StormTech MC-3500 d +Cap x 120 Inside #1 Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap 120 Chambers in 6 Rows Cap Storage= 14.9 cf x 2 x 6 rows = 178.8 cf #3 596.00' 3,960 cf Custom Stage Data (Prismatic)Listed below (Recalc) 26,499 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 596.00 6,600 0.0 0 0 597.50 6,600 40.0 3,960 3,960 Device Routing Invert Outlet Devices #1 Primary 590.50' 8.0" Round Culvert L= 120.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 590.50' / 589.25' S= 0.0104 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.35 sf #2 Device 1 591.25' 4.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 594.35' 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=2.37 cfs @ 12.58 hrs HW=595.88' TW=0.00' (Dynamic Tailwater) 1=Culvert (Barrel Controls 2.37 cfs @ 6.78 fps) 2=Orifice/Grate (Passes < 0.89 cfs potential flow) 3=Sharp-Crested Rectangular Weir (Passes < 22.91 cfs potential flow) Page 553 of 1174