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• , , Stonebrooke Engineering 3227 Casco Circle, Orono MN Courtyard Type ll 24-hr 100-year(2) Rainfa11=5.90"x 2 Prepared by Stonebrooke Engineering Printed 9/19/2013 HydroCADO 10.00 s/n 02307 O 2012 HydroCAD Software Solutions LLC Paqe 10 Summary for Pond 13P: filtration basin Inflow Area = 0.084 ac, 23.76% Impervious, Inflow Depth = 9.25" for 100-year(2) event Inflow = 0.65 cfs @ 35.98 hrs, Volume= 0.065 af Outflow = 0.64 cfs @ 35.99 hrs, Volume= 0.052 af, Atten= 2%, Lag= 0.9 min Primary = 0.64 cfs @ 35.99 hrs, Volume= 0.052 af Routing by Stor-Ind method, Time Span= 1.00-50.00 hrs, dt= 0.01 hrs Peak Elev= 947.29' @ 35.99 hrs Surf.Area= 624 sf Storage= 621 cf Plug-Flow detention time= 431.0 min calculated for 0.052 af(80% of inflow) Center-of-Mass det. time= 242.8 min ( 1,869.0 - 1,626.2 ) 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=0.64 cfs @ 35.99 hrs HW=947.29' (Free Discharge) L =RCP Round 8" (Passes 0.64 cfs of 2.23 cfs potential flow) �2=Exfiltration (Exfiltration Controls 0.00 cfs) 3=0rifice/Grate (Weir Controls 0.63 cfs @ 0.98 fps)