Drainage Report

Basin 2-6 w/ exfiltration Proposed Basin 2-6 R5 infil 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 37P: Pond 2-6 Inflow Area = 1.842 ac, Inflow Depth = 3.21" for 2-Year event Inflow = 5.13 cfs @ 12.17 hrs, Volume= 0.492 af Outflow = 0.17 cfs @ 16.26 hrs, Volume= 0.492 af, Atten= 97%, Lag= 245.3 min Discarded = 0.17 cfs @ 16.26 hrs, Volume= 0.492 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= 541.71' @ 16.26 hrs Surf.Area= 10,782 sf Storage= 13,026 cf Plug-Flow detention time= 779.5 min calculated for 0.492 af (100% of inflow) Center-of-Mass det. time= 780.1 min ( 1,540.5 - 760.4 ) Volume Invert Avail.Storage Storage Description #1 540.50' 37,737 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 10,782 0 0 544.00 10,782 37,737 37,737 Device Routing Invert Outlet Devices #1 Discarded 540.50' 0.450 in/hr Exfiltration over Horizontal area Conductivity to Groundwater Elevation = 538.00' #2 Primary 541.80' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.17 cfs @ 16.26 hrs HW=541.71' (Free Discharge) 1=Exfiltration ( Controls 0.17 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=540.50' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs)