Drainage Report

Basin 2-2 with exfil Proposed Basin 2-2 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 42P: Pond 2-2 Inflow Area = 1.412 ac, Inflow Depth = 2.51" for 2-Year event Inflow = 3.19 cfs @ 12.17 hrs, Volume= 0.295 af Outflow = 0.09 cfs @ 17.29 hrs, Volume= 0.295 af, Atten= 97%, Lag= 306.9 min Discarded = 0.09 cfs @ 17.29 hrs, Volume= 0.295 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= 543.11' @ 17.29 hrs Surf.Area= 7,112 sf Storage= 7,908 cf Plug-Flow detention time= 825.9 min calculated for 0.295 af (100% of inflow) Center-of-Mass det. time= 825.5 min ( 1,611.8 - 786.3 ) Volume Invert Avail.Storage Storage Description #1 542.00' 28,448 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 7,112 0 0 546.00 7,112 28,448 28,448 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=0.09 cfs @ 17.29 hrs HW=543.11' (Free Discharge) 1=Exfiltration ( Controls 0.09 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)