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24-4113 WEST SENECA EXCAHNGE NY-WestSeneca_NOAA14 24-hr S1 1-yr Rainfall=1.87" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 18 Summary for Pond 18P: POND [44] Hint: Outlet device #1 is below defined storage Inflow Area = 48.355 ac, 79.40% Impervious, Inflow Depth = 1.31" for 1-yr event Inflow = 106.67 cfs @ 12.03 hrs, Volume= 5.283 af Outflow = 20.20 cfs @ 12.36 hrs, Volume= 5.283 af, Atten= 81%, Lag= 20.0 min Primary = 20.20 cfs @ 12.36 hrs, Volume= 5.283 af Routed to Pond 16P : OUTLET PIPE Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-150.00 hrs, dt= 0.01 hrs Peak Elev= 609.62' @ 12.36 hrs Surf.Area= 64,897 sf Storage= 99,248 cf Plug-Flow detention time= 185.3 min calculated for 5.283 af (100% of inflow) Center-of-Mass det. time= 185.5 min ( 983.8 - 798.3 ) Volume Invert Avail.Storage Storage Description #1 608.00' 471,250 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 608.00 57,300 0 0 614.50 87,700 471,250 471,250 Device Routing Invert Outlet Devices #1 Primary 607.95' 48.0" Round Culvert L= 685.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 607.95' / 604.56' S= 0.0049 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 12.57 sf #2 Secondary 614.00' 50.0' long + 3.0 '/' SideZ x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=20.20 cfs @ 12.36 hrs HW=609.62' TW=604.95' (Dynamic Tailwater) 1=Culvert (Barrel Controls 20.20 cfs @ 5.98 fps) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=608.00' (Free Discharge) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Page 753 of 1174