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Stonebrooke Engineering 3227 Casco Circle, Orono MN Courtyard Type 1124-hr 10-year Rainfall=4.15" Prepared by Stonebrooke Engineering Printed 9/19/2013 HydroCADO 10.00 s/n 02307 O 2012 HydroCAD Software Solutions LLC Page 4 Summary for Pond 13P: filtration basin Inflow Area = 0.084 ac, 23.76% Impervious, Inflow Depth = 2.17" for 10-year event Inflow = 0.31 cfs @ 11.99 hrs, Volume= 0.015 af Outflow = 0.00 cfs @ 18.85 hrs, Volume= 0.004 af, Atten= 99%, Lag= 412.2 min Primary = 0.00 cfs @ 18.85 hrs, Volume= 0.004 af Routing by Stor-Ind method, Time Span= 1.00-50.00 hrs, dt= 0.01 hrs Peak Elev= 947.20' @ 18.85 hrs Surf.Area= 473 sf Storage= 571 cf Plug-Flow detention time= 867.2 min calculated for 0.004 af(25% of inflow) Center-of-Mass det. time= 733.2 min ( 1,561.1 - 827.9 ) Volume Invert Avail.Storage Storage Description #1 945.50' 1,484 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 945.50 340 0.0 0 0 945.60 340 40.0 14 14 947.00 340 100.0 476 490 947.20 472 100.0 81 571 948.00 1,811 100.0 913 1,484 Device Routing Invert Outlet Devices #1 Primary 944.00' 8.0" Round RCP_Round 8" L= 75.0' RCP, square edge headwall, Ke= 0.500 Inlet/ Outlet Invert= 944.00' / 943.50' S= 0.0067 '/' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 0.35 sf #2 Device 1 947.00' 0.600 in/hr Exfiltration over Surface area above 947.00' Excluded Surface area = 340 sf #3 Device 1 947.20' 27.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.00 cfs @ 18.85 hrs HW=947.20' (Free Discharge) L1=RCP Round 8" (Passes 0.00 cfs of 2.19 cfs potential flow) �2=Exfiltration (Exfiltration Controls 0.00 cfs) 3=0rifice/Grate (Weir Controls 0.00 cfs @ 0.09 fps)