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 42 Summary for Pond 13FT: 10x6 FT Inflow Area = Inflow = Outflow = Primary = 8,844 sf, 62.80% Impervious, Inflow Depth = 0.71" for WQ event 0.45 cfs @ 1.08 hrs, Volume= 526 cf 0.42 cfs @ 1.04 hrs, Volume= 517 cf, Atten= 7%, Lag= 0.0 min 0.42 cfs @ 1.04 hrs, Volume= 517 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.07' @ 1.09 hrs Surf.Area= 60 sf Storage= 4 cf Plug-Flow detention time= 0.9 min calculated for 517 cf (98% of inflow) Center-of-Mass det. time= 0.0 min ( 67.0 - 67.0 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 45 cf Invert 0.00' Storage Description 10.00'W x 6.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.42 cfs @ 1.04 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.42 cfs @ 0.01 fps) Pond 13FT: 10x6 FT Hydrograph Flow (cfs) 0.45 cfs 0.48 0.46 0.44 0.42 cfs 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 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) Inflow Area=8,844 sf Peak Elev=0.07' Storage=4 cf Inflow Primary