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Type II 24-hr 10-year Rainfall=4.17"25018 Proposed Hydro Printed 10/29/2025Prepared by Land & Resource Consulting Inc Page 26HydroCAD® 10.20-7a s/n 12643 © 2025 HydroCAD Software Solutions LLC Summary for Pond 1P: Onsite Lowpoint Inflow Area = 41,100 sf, 23.36% Impervious, Inflow Depth = 3.37" for 10-year event Inflow = 4.84 cfs @ 11.98 hrs, Volume= 11,558 cf Outflow = 3.92 cfs @ 12.03 hrs, Volume= 11,558 cf, Atten= 19%, Lag= 3.1 min Discarded = 0.01 cfs @ 12.03 hrs, Volume= 926 cf Primary = 3.91 cfs @ 12.03 hrs, Volume= 10,632 cf Routed to Reach 2R : Site to West Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 959.56' @ 12.03 hrs Surf.Area= 1,823 sf Storage= 2,009 cf Plug-Flow detention time= 102.2 min calculated for 11,558 cf (100% of inflow) Center-of-Mass det. time= 102.2 min ( 870.0 - 767.9 ) Volume Invert Avail.Storage Storage Description #1 958.00' 4,769 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 958.00 800 0 0 959.00 1,400 1,100 1,100 960.00 2,150 1,775 2,875 960.75 2,900 1,894 4,769 Device Routing Invert Outlet Devices #1 Primary 954.41'18.0" Round Culvert L= 61.0' CMP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 954.41' / 953.30' S= 0.0182 '/' Cc= 0.900 n= 0.013 Concrete pipe, straight & clean, Flow Area= 1.77 sf #2 Discarded 958.00'0.200 in/hr Exfiltration over Surface area #3 Device 1 958.50'15.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 960.50'48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.01 cfs @ 12.03 hrs HW=959.56' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=3.91 cfs @ 12.03 hrs HW=959.56' (Free Discharge) 1=Culvert (Passes 3.91 cfs of 17.85 cfs potential flow) 3=Orifice/Grate (Orifice Controls 3.91 cfs @ 3.51 fps) 4=Orifice/Grate ( Controls 0.00 cfs)