2013-00728 (new structure) - Laserfiche WebLink

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Stonebrooke Engineering 3227 Casco Circle, Orono MN Courtyard Type 1124-hr 100-year Rainfa11=5.90" Prepared by Stonebrooke Engineering Printed 9/19/2013 HydroCADO 10.00 s/n 02307 O 2012 HydroCAD Software Solutions LLC Paqe 7 Summary for Pond 13P: filtration basin Inflow Area = 0.084 ac, 23.76% Impervious, Inflow Depth = 3.69" for 100-year event Inflow = 0.52 cfs @ 11.98 hrs, Volume= 0.026 af Outflow = 0.13 cfs @ 12.14 hrs, Volume= 0.014 af, Atten= 76%, Lag= 9.7 min Primary = 0.13 cfs @ 12.14 hrs, Volume= 0.014 af Routing by Stor-Ind method, Time Span= 1.00-50.00 hrs, dt= 0.01 hrs Peak Elev= 947.23' @ 12.14 hrs Surf.Area= 522 sf Storage= 586 cf Plug-Flow detention time= 352.8 min calculated for 0.014 af(56% of inflow) Center-of-Mass det. time= 240.9 min ( 1,053.6 - 812.7 ) Volume Invert Avail.Storaqe 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 Routinq 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=0.12 cfs @ 12.14 hrs HW=947.23' (Free Discharge) t1=RCP Round 8" (Passes 0.12 cfs of 2.20 cfs potential flow) �2=Exfiltration (Exfiltration Controls 0.00 cfs) 3=0rifice/Grate (Weir Controls 0.12 cfs @ 0.56 fps)