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24-4113 WEST SENECA EXCAHNGENY-WestSeneca_NOAA14 24-hr S1 10-yr Rainfall=3.39" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 32 Summary for Pond 18P: POND [44] Hint: Outlet device #1 is below defined storage Inflow Area = 48.355 ac, 79.40% Impervious, Inflow Depth = 2.76" for 10-yr event Inflow = 218.75 cfs @ 12.02 hrs, Volume= 11.119 af Outflow = 53.90 cfs @ 12.25 hrs, Volume= 11.119 af, Atten= 75%, Lag= 13.3 min Primary = 53.90 cfs @ 12.25 hrs, Volume= 11.119 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= 610.89' @ 12.25 hrs Surf.Area= 70,836 sf Storage= 185,425 cf Plug-Flow detention time= 131.1 min calculated for 11.118 af (100% of inflow) Center-of-Mass det. time= 131.3 min ( 910.8 - 779.5 ) 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=53.90 cfs @ 12.25 hrs HW=610.89' TW=606.37' (Dynamic Tailwater) 1=Culvert (Barrel Controls 53.90 cfs @ 7.58 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 767 of 1174