Drainage Report

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 42 Summary for Pond 29P: Basin 1 Inflow Area = 7.230 ac, Inflow Depth = 7.30" for 100-Year event Inflow = 29.62 cfs @ 12.41 hrs, Volume= 4.400 af Outflow = 2.09 cfs @ 15.28 hrs, Volume= 2.848 af, Atten= 93%, Lag= 172.1 min Primary = 2.09 cfs @ 15.28 hrs, Volume= 2.848 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 544.77' @ 15.28 hrs Surf.Area= 42,071 sf Storage= 136,068 cf Plug-Flow detention time= 699.4 min calculated for 2.848 af (65% of inflow) Center-of-Mass det. time= 584.0 min ( 1,370.7 - 786.7 ) 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=2.09 cfs @ 15.28 hrs HW=544.77' (Free Discharge) 1=Orifice/Grate (Orifice Controls 2.09 cfs @ 5.98 fps)