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24-4113 WEST SENECA EXCAHNGENY-WestSeneca_NOAA14 24-hr S1 25-yr Rainfall=4.10" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 46 Summary for Pond 18P: POND [44] Hint: Outlet device #1 is below defined storage Inflow Area = 48.355 ac, 79.40% Impervious, Inflow Depth = 3.45" for 25-yr event Inflow = 271.07 cfs @ 12.02 hrs, Volume= 13.907 af Outflow = 69.28 cfs @ 12.23 hrs, Volume= 13.907 af, Atten= 74%, Lag= 12.4 min Primary = 69.28 cfs @ 12.23 hrs, Volume= 13.907 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= 611.43' @ 12.23 hrs Surf.Area= 73,324 sf Storage= 223,774 cf Plug-Flow detention time= 119.2 min calculated for 13.906 af (100% of inflow) Center-of-Mass det. time= 119.4 min ( 893.6 - 774.2 ) 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=69.28 cfs @ 12.23 hrs HW=611.43' TW=606.95' (Dynamic Tailwater) 1=Culvert (Barrel Controls 69.28 cfs @ 7.99 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 781 of 1174