Drainage Report

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 16 Summary for Pond 29P: Basin 1 Inflow Area = 7.230 ac, Inflow Depth = 2.43" for 2-Year event Inflow = 9.88 cfs @ 12.42 hrs, Volume= 1.466 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 542.84' @ 25.80 hrs Surf.Area= 32,964 sf Storage= 63,856 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 540.50' 191,393 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 21,047 0 0 542.00 29,152 37,649 37,649 544.00 38,188 67,340 104,989 546.00 48,216 86,404 191,393 Device Routing Invert Outlet Devices #1 Primary 542.90' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=540.50' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs)