Drainage Report

Basin 5 w/ exfiltration Proposed basin 5 R5 infilt 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 2 Summary for Pond 24P: Infiltration basin 5 Inflow Area = 2.275 ac, Inflow Depth = 2.46" for 2-Year event Inflow = 4.83 cfs @ 12.19 hrs, Volume= 0.466 af Outflow = 0.10 cfs @ 21.56 hrs, Volume= 0.466 af, Atten= 98%, Lag= 562.6 min Discarded = 0.10 cfs @ 21.56 hrs, Volume= 0.466 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.03 hrs Peak Elev= 571.63' @ 21.56 hrs Surf.Area= 12,410 sf Storage= 13,994 cf Plug-Flow detention time= 1,329.6 min calculated for 0.466 af (100% of inflow) Center-of-Mass det. time= 1,330.2 min ( 2,112.3 - 782.2 ) 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 Discarded 570.50' 0.320 in/hr Exfiltration over Wetted area Conductivity to Groundwater Elevation = -2.00' #2 Primary 572.40' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.10 cfs @ 21.56 hrs HW=571.63' (Free Discharge) 1=Exfiltration ( Controls 0.10 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=570.50' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs)