Drainage Report

Basin 2-3 with exfiltration Proposed Basin 2-3 R3 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 10 Summary for Pond 44P: pond 2-3 Inflow Area = 2.259 ac, Inflow Depth = 2.30" for 2-Year event Inflow = 4.65 cfs @ 12.18 hrs, Volume= 0.434 af Outflow = 0.14 cfs @ 17.51 hrs, Volume= 0.434 af, Atten= 97%, Lag= 320.0 min Discarded = 0.14 cfs @ 17.51 hrs, Volume= 0.434 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= 0.05 hrs Peak Elev= 543.12' @ 17.51 hrs Surf.Area= 10,412 sf Storage= 11,645 cf Plug-Flow detention time= 836.6 min calculated for 0.434 af (100% of inflow) Center-of-Mass det. time= 836.2 min ( 1,630.8 - 794.6 ) Volume Invert Avail.Storage Storage Description #1 542.00' 41,648 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 10,412 0 0 546.00 10,412 41,648 41,648 Device Routing Invert Outlet Devices #1 Discarded 542.00' 0.450 in/hr Exfiltration over Horizontal area Conductivity to Groundwater Elevation = 538.00' #2 Primary 543.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 543.75' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.14 cfs @ 17.51 hrs HW=543.12' (Free Discharge) 1=Exfiltration ( Controls 0.14 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=542.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs)