Drainage Report

Basin 5 witout exfiltration Proposed basin 5 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 28 Summary for Pond 24P: Infiltration basin 5 Inflow Area = 2.275 ac, Inflow Depth = 4.08" for 10-Year event Inflow = 8.00 cfs @ 12.19 hrs, Volume= 0.773 af Outflow = 0.35 cfs @ 15.15 hrs, Volume= 0.231 af, Atten= 96%, Lag= 177.6 min Primary = 0.35 cfs @ 15.15 hrs, Volume= 0.231 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.03 hrs Peak Elev= 572.57' @ 15.15 hrs Surf.Area= 12,410 sf Storage= 25,739 cf Plug-Flow detention time= 580.4 min calculated for 0.231 af (30% of inflow) Center-of-Mass det. time= 376.7 min ( 1,152.6 - 775.9 ) Volume Invert Avail.Storage Storage Description #1 570.50' 43,435 cf Custom Stage Data (Conic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 570.50 12,410 0 0 12,410 574.00 12,410 43,435 43,435 13,792 Device Routing Invert Outlet Devices #1 Primary 572.40' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.35 cfs @ 15.15 hrs HW=572.57' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.35 cfs @ 1.34 fps)