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Type II 24-hr 2-year Rainfall=2.79"25018 Proposed Hydro Printed 10/29/2025Prepared by Land & Resource Consulting Inc Page 14HydroCAD® 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 = 2.09" for 2-year event Inflow = 3.05 cfs @ 11.98 hrs, Volume= 7,159 cf Outflow = 2.47 cfs @ 12.03 hrs, Volume= 7,159 cf, Atten= 19%, Lag= 3.1 min Discarded = 0.01 cfs @ 12.03 hrs, Volume= 892 cf Primary = 2.47 cfs @ 12.03 hrs, Volume= 6,267 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= 959.29' @ 12.03 hrs Surf.Area= 1,616 sf Storage= 1,535 cf Plug-Flow detention time= 148.4 min calculated for 7,158 cf (100% of inflow) Center-of-Mass det. time= 148.7 min ( 925.7 - 777.0 ) 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=959.29' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=2.46 cfs @ 12.03 hrs HW=959.29' (Free Discharge) 1=Culvert (Passes 2.46 cfs of 17.29 cfs potential flow) 3=Orifice/Grate (Orifice Controls 2.46 cfs @ 3.02 fps) 4=Orifice/Grate ( Controls 0.00 cfs)