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Type II 24-hr 10-year Rainfall=4.17"25018 Existing Hydro <br /> Printed 10/29/2025Prepared by Land & Resource Consulting Inc <br />Page 18HydroCAD® 10.20-7a s/n 12643 © 2025 HydroCAD Software Solutions LLC <br />Summary for Subcatchment 3S: Offsite North to Driveway Culvert <br />Runoff = 1.77 cfs @ 11.98 hrs, Volume= 4,238 cf, Depth= 3.53" <br /> Routed to Reach 3R : Driveway Culvert <br />Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs <br />Type II 24-hr 10-year Rainfall=4.17" <br />Area (sf) CN Description <br />2,800 98 Roofs, HSG C <br />10,000 96 Gravel surface, HSG C <br />1,600 74 >75% Grass cover, Good, HSG C <br />14,400 Weighted Average <br />11,600 80.56% Pervious Area <br />2,800 19.44% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />7.0 Direct Entry, <br />Subcatchment 3S: Offsite North to Driveway Culvert <br />Runoff <br />Hydrograph <br />Time (hours) <br />727068666462605856545250484644424038363432302826242220181614121086420 <br />Fl <br />o <br />w <br /> <br /> <br />( <br />c <br />f <br />s <br />) <br />1 <br />0 <br />Type II 24-hr <br />10-year Rainfall=4.17" <br />Runoff Area=14,400 sf <br />Runoff Volume=4,238 cf <br />Runoff Depth=3.53" <br />Tc=7.0 min <br />CN=WQ <br /> 1.77 cfs