Drainage Report

basin 2-1 eith exfil WQ Proposed Basin 2-1 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 2 Summary for Pond 41P: Pond 2-1 Inflow Area = 0.599 ac, Inflow Depth = 1.36" for 2-Year event Inflow = 0.79 cfs @ 12.18 hrs, Volume= 0.068 af Outflow = 0.02 cfs @ 19.47 hrs, Volume= 0.068 af, Atten= 97%, Lag= 437.2 min Discarded = 0.02 cfs @ 19.47 hrs, Volume= 0.068 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= 546.93' @ 19.47 hrs Surf.Area= 2,020 sf Storage= 1,883 cf Plug-Flow detention time= 848.3 min calculated for 0.068 af (100% of inflow) Center-of-Mass det. time= 848.0 min ( 1,709.6 - 861.6 ) Volume Invert Avail.Storage Storage Description #1 546.00' 4,040 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 546.00 2,020 0 0 548.00 2,020 4,040 4,040 Device Routing Invert Outlet Devices #1 Discarded 546.00' 0.450 in/hr Exfiltration over Horizontal area Conductivity to Groundwater Elevation = 538.00' #2 Primary 546.95' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 547.20' 10.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.02 cfs @ 19.47 hrs HW=546.93' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=546.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs)