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 40 Summary for Pond 11FT: 12x6 FT Inflow Area = Inflow = Outflow = Primary = 14,814 sf, 45.12% Impervious, Inflow Depth = 0.56" for WQ event 0.60 cfs @ 1.09 hrs, Volume= 694 cf 0.50 cfs @ 1.02 hrs, Volume= 681 cf, Atten= 17%, Lag= 0.0 min 0.50 cfs @ 1.02 hrs, Volume= 681 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.24' @ 1.10 hrs Surf.Area= 72 sf Storage= 17 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.1 min ( 68.6 - 68.5 ) 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 @ 1.02 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.50 cfs @ 0.01 fps) Pond 11FT: 12x6 FT Hydrograph 0.65 0.60 cfs 0.6 0.55 0.50 cfs 0.5 Flow (cfs) 0.45 Inflow Primary Inflow Area=14,814 sf Peak Elev=0.24' Storage=17 cf 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)