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77 Echo Rd Type //24-hr 100-Year Rainfall=7.73" <br /> Prepared by (enter your company name here) Printed 7/2/2024 <br /> H droCAD®9.10 s/n 02973 ©2009 H droCAD Software Solutions LLC Pa e 2 <br /> Summary for Subcatchment A: Site <br /> Runoff = 6.68 cfs @ 12.01 hrs, Volume= 15,718 cf, Depth= 3.79" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs <br /> Type II 24-hr 100-Year Rainfall=7.73" <br /> Area sf CN Descri tion <br /> * 300 98 pavement <br /> 39,500 72 Dirt roads, HSG A <br /> 10,000 39 >75% Grass <br /> 49,800 66 Weighted Average <br /> 49,500 99.40% Pervious Area <br /> 300 0.60% Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> min feet ft/ft ft/sec cfs <br /> 10.0 Direct Entry, 260-feet through gravel yard <br /> Summary for Subcatchment B: Pad <br /> Runoff = 1.31 cfs @ 11.95 hrs, Volume= 3,121 cf, Depth= 7.49" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs <br /> Type II 24-hr 100-Year Rainfall=7.73" <br /> Area sf CN Description <br /> * 5,000 98 pavement <br /> 5,000 100,00% Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> min feet ft/ft ft/sec cfs <br /> 5.0 Direct Entry, 50-feet through pad <br /> Summary for Pond DB: Basin <br /> Inflow Area = 54,800 sf, 9.67% Impervious, Inflow Depth = 4.13" for 100-Year event <br /> Inflow = 7.64 cfs @ 12.00 hrs, Volume= 18,839 cf <br /> Outflow = 0.40 cfs @ 11.95 hrs, Volume= 18,839 cf, Atten= 95%, Lag= 0.0 min <br /> Discarded = 0.40 cfs @ 11.95 hrs, Volume= 18,839 cf <br /> Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs <br /> Peak Elev= 110.77' @ 13.41 hrs Surf.Area= 1,120 sf Storage= 8,919 cf <br /> Plug-Flow detention time= 209.6 min calculated for 18,833 cf(100% of inflow) <br /> Center-of-Mass det. time= 209.5 min ( 1,028.2 -818.7 ) <br />