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E_App E_Post-Development Model NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 21 Summary for Pond CH-1: Chambers Inflow Area = 2.091 ac, 90.96% Impervious, Inflow Depth = 1.44" for 1-yr event Inflow = 4.80 cfs @ 12.04 hrs, Volume= 0.251 af Outflow = 1.18 cfs @ 12.29 hrs, Volume= 0.251 af, Atten= 75%, Lag= 15.4 min Primary = 1.18 cfs @ 12.29 hrs, Volume= 0.251 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= 592.38' @ 12.29 hrs Surf.Area= 0.127 ac Storage= 0.079 af Flood Elev= 598.32' Surf.Area= 0.127 ac Storage= 0.433 af Plug-Flow detention time= 60.5 min calculated for 0.251 af (100% of inflow) Center-of-Mass det. time= 60.2 min ( 847.2 - 787.0 ) Volume Invert Avail.Storage Storage Description #1A 591.25' 0.177 af 37.08'W x 149.10'L x 5.50'H Field A 0.698 af Overall - 0.256 af Embedded = 0.442 af x 40.0% Voids #2A 592.00' 0.256 af ADS_StormTech MC-3500 d +Cap x 100 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 100 Chambers in 5 Rows Cap Storage= 14.9 cf x 2 x 5 rows = 149.0 cf 0.433 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 591.25' 8.0" Round Culvert L= 25.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 591.25' / 591.00' S= 0.0100 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.35 sf Primary OutFlow Max=1.18 cfs @ 12.29 hrs HW=592.38' TW=0.00' (Dynamic Tailwater) 1=Culvert (Inlet Controls 1.18 cfs @ 3.38 fps) Page 217 of 849