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E_App E_Post-Development Model NY-West Seneca 24-hr S1 10-yr Rainfall=3.14" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 36 Summary for Pond BIO-2: Filtration Bioretention Inflow Area = 0.649 ac, 33.49% Impervious, Inflow Depth = 1.78" for 10-yr event Inflow = 1.75 cfs @ 12.04 hrs, Volume= 0.096 af Outflow = 1.06 cfs @ 12.13 hrs, Volume= 0.096 af, Atten= 39%, Lag= 5.6 min Primary = 0.02 cfs @ 12.13 hrs, Volume= 0.048 af Routed to Reach DP-1 : Design Point Secondary = 1.04 cfs @ 12.13 hrs, Volume= 0.048 af Routed to Reach DP-1 : Design Point Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 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= 597.12' @ 12.13 hrs Surf.Area= 1,941 sf Storage= 1,319 cf Flood Elev= 598.00' Surf.Area= 2,630 sf Storage= 3,339 cf Plug-Flow detention time= 339.7 min calculated for 0.096 af (100% of inflow) Center-of-Mass det. time= 339.9 min ( 1,162.0 - 822.1 ) Volume Invert Avail.Storage Storage Description #1 596.00' 3,339 cf Above Mulch Surface (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 596.00 348 0 0 597.00 1,850 1,099 1,099 598.00 2,630 2,240 3,339 Device Routing Invert Outlet Devices #1 Primary 596.00' 0.500 in/hr Exfiltration Through Media over Surface area #2 Device 3 597.00' 24.0" x 24.0" Horiz. Overflow Grate C= 0.600 Limited to weir flow at low heads #3 Secondary 592.58' 12.0" Round Culvert L= 132.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 592.58' / 591.92' S= 0.0050 '/' Cc= 0.900 n= 0.012 Corrugated PE, smooth interior, Flow Area= 0.79 sf #4 Tertiary 597.50' 10.0' long x 3.0' breadth Emergency Overflow Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32 Primary OutFlow Max=0.02 cfs @ 12.13 hrs HW=597.12' TW=0.00' (Dynamic Tailwater) 1=Exfiltration Through Media (Exfiltration Controls 0.02 cfs) Secondary OutFlow Max=1.04 cfs @ 12.13 hrs HW=597.12' TW=0.00' (Dynamic Tailwater) 3=Culvert (Passes 1.04 cfs of 5.54 cfs potential flow) 2=Overflow Grate (Weir Controls 1.04 cfs @ 1.11 fps) Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=596.00' TW=0.00' (Dynamic Tailwater) 4=Emergency Overflow Weir ( Controls 0.00 cfs) Page 236 of 1493