complete drainage report rev 9

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 47 Summary for Pond 18FT: 8x6 FT Inflow Area = Inflow = Outflow = Primary = 6,259 sf, 73.21% Impervious, Inflow Depth = 0.80" for WQ event 0.35 cfs @ 1.08 hrs, Volume= 419 cf 0.33 cfs @ 1.04 hrs, Volume= 414 cf, Atten= 5%, Lag= 0.0 min 0.33 cfs @ 1.04 hrs, Volume= 414 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.05' @ 1.09 hrs Surf.Area= 48 sf Storage= 2 cf Plug-Flow detention time= 0.7 min calculated for 414 cf (99% of inflow) Center-of-Mass det. time= 0.0 min ( 66.8 - 66.8 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 36 cf Invert 0.00' Storage Description 8.00'W x 6.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.33 cfs @ 1.04 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.33 cfs @ 0.01 fps) Pond 18FT: 8x6 FT Hydrograph 0.38 0.35 cfs 0.36 0.33 cfs 0.34 0.32 0.3 0.28 Flow (cfs) 0.26 Inflow Primary Inflow Area=6,259 sf Peak Elev=0.05' Storage=2 cf 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)