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 37 Summary for Pond 4FT: 12x6 FT Inflow Area = Inflow = Outflow = Primary = 16,388 sf, 43.94% Impervious, Inflow Depth = 0.55" for WQ event 0.66 cfs @ 1.09 hrs, Volume= 753 cf 0.50 cfs @ 1.00 hrs, Volume= 740 cf, Atten= 25%, Lag= 0.0 min 0.50 cfs @ 1.00 hrs, Volume= 740 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.49' @ 1.10 hrs Surf.Area= 72 sf Storage= 35 cf Plug-Flow detention time= 1.1 min calculated for 740 cf (98% of inflow) Center-of-Mass det. time= 0.2 min ( 68.5 - 68.3 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 54 cf Invert 0.00' Storage Description 12.00'W x 6.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.50 cfs @ 1.00 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.50 cfs @ 0.01 fps) Pond 4FT: 12x6 FT Hydrograph 0.7 0.66 cfs 0.65 0.6 0.55 0.5 0.50 cfs Inflow Primary Inflow Area=16,388 sf Peak Elev=0.49' Storage=35 cf Flow (cfs) 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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)