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Type II 24-hr 2-year Rainfall=2.79"25018 Existing Hydro <br /> Printed 10/29/2025Prepared by Land & Resource Consulting Inc <br />Page 13HydroCAD® 10.20-7a s/n 12643 © 2025 HydroCAD Software Solutions LLC <br />Summary for Pond 1P: Onsite Lowpoint <br />Inflow Area = 42,900 sf, 11.19% Impervious, Inflow Depth = 1.95" for 2-year event <br />Inflow = 3.00 cfs @ 11.98 hrs, Volume= 6,982 cf <br />Outflow = 2.69 cfs @ 12.02 hrs, Volume= 6,839 cf, Atten= 10%, Lag= 2.2 min <br />Primary = 2.69 cfs @ 12.02 hrs, Volume= 6,839 cf <br /> Routed to Reach 2R : Site to West <br />Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs <br />Peak Elev= 955.09' @ 12.02 hrs Surf.Area= 1,165 sf Storage= 805 cf <br />Plug-Flow detention time= 34.2 min calculated for 6,839 cf (98% of inflow) <br />Center-of-Mass det. time= 21.2 min ( 803.9 - 782.7 ) <br />Volume Invert Avail.Storage Storage Description <br />#1 954.00' 10,850 cf Custom Stage Data (Prismatic) Listed below (Recalc) <br />Elevation Surf.Area Inc.Store Cum.Store <br />(feet) (sq-ft) (cubic-feet) (cubic-feet) <br />954.00 300 0 0 <br />955.00 1,100 700 700 <br />956.00 1,800 1,450 2,150 <br />957.00 2,500 2,150 4,300 <br />958.00 3,200 2,850 7,150 <br />959.00 4,200 3,700 10,850 <br />Device Routing Invert Outlet Devices <br />#1 Primary 954.33'18.0" Round Culvert <br />L= 56.0' CMP, end-section conforming to fill, Ke= 0.500 <br />Inlet / Outlet Invert= 954.33' / 953.30' S= 0.0184 '/' Cc= 0.900 <br />n= 0.013 Concrete pipe, straight & clean, Flow Area= 1.77 sf <br />Primary OutFlow Max=2.68 cfs @ 12.02 hrs HW=955.09' (Free Discharge) <br />1=Culvert (Inlet Controls 2.68 cfs @ 2.97 fps)