Drainage Report

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 29 Summary for Pond 29P: Basin 1 Inflow Area = 7.230 ac, Inflow Depth = 4.04" for 10-Year event Inflow = 16.45 cfs @ 12.41 hrs, Volume= 2.435 af Outflow = 0.75 cfs @ 17.63 hrs, Volume= 0.891 af, Atten= 95%, Lag= 312.9 min Primary = 0.75 cfs @ 17.63 hrs, Volume= 0.891 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.44' @ 17.63 hrs Surf.Area= 35,635 sf Storage= 84,135 cf Plug-Flow detention time= 838.1 min calculated for 0.891 af (37% of inflow) Center-of-Mass det. time= 660.0 min ( 1,454.5 - 794.5 ) 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=0.75 cfs @ 17.63 hrs HW=543.44' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.75 cfs @ 2.49 fps)