Drainage Report

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 25 Summary for Pond 43P: pond 2-4 Inflow Area = 2.205 ac, Inflow Depth = 3.46" for 10-Year event Inflow = 7.12 cfs @ 12.17 hrs, Volume= 0.636 af Outflow = 0.62 cfs @ 13.56 hrs, Volume= 0.403 af, Atten= 91%, Lag= 83.3 min Primary = 0.62 cfs @ 13.56 hrs, Volume= 0.403 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.52' @ 13.56 hrs Surf.Area= 11,090 sf Storage= 16,883 cf Plug-Flow detention time= 442.1 min calculated for 0.402 af (63% of inflow) Center-of-Mass det. time= 327.7 min ( 1,132.3 - 804.5 ) Volume Invert Avail.Storage Storage Description #1 542.00' 44,360 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 11,090 0 0 546.00 11,090 44,360 44,360 Device Routing Invert Outlet Devices #1 Primary 542.90' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 543.40' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.62 cfs @ 13.56 hrs HW=543.52' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.58 cfs @ 2.94 fps) 2=Orifice/Grate (Orifice Controls 0.04 cfs @ 1.19 fps)