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 41 Summary for Pond 12FT: 6x4 FT Inflow Area = Inflow = Outflow = Primary = 2,694 sf,100.00% Impervious, Inflow Depth = 1.03" for WQ event 0.19 cfs @ 1.08 hrs, Volume= 232 cf 0.17 cfs @ 0.97 hrs, Volume= 237 cf, Atten= 12%, Lag= 0.0 min 0.17 cfs @ 0.97 hrs, Volume= 237 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.35' @ 1.10 hrs Surf.Area= 24 sf Storage= 9 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.3 min ( 66.6 - 66.4 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 18 cf Invert 0.00' Storage Description 6.00'W x 4.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.17 cfs @ 0.97 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.17 cfs @ 0.01 fps) Pond 12FT: 6x4 FT Hydrograph 0.21 0.19 cfs 0.2 0.19 0.18 0.17 cfs 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 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) Flow (cfs) Inflow Area=2,694 sf Peak Elev=0.35' Storage=9 cf Inflow Primary