Asbuilt Storm Water Management Plan

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Z:\HydroCAD\HCDATA\MBB\ As Built 11586 SPENSA - ORONO -revised 10-28-09 Grout Riprap Type 1124-hr 10 yr Rainfall=4.20" Prepared by Anderson Engineering of MN LLC Page 7 HydroCADO 8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 10/29/2009 Routing by Stor-Ind+Trans method, Time Span=4.00-27.00 hrs, dt= 0.05 hrs Pond RAIN G: POND 1 Inflow Area = 0.977 ac, Inflow Depth = 2.92" for 10 yr event Inflow = 4.20 cfs @ 12.01 hrs, Volume= 0.237 of Outflow = 2,11 cfs @ 12.14 hrs, Volume= 0.169 af, Atten= 50%, Lag= 8.0 min Discarded = 0.05 cfs @ 12.14 hrs, Volume= 0.063 of Primary = 2.06 cfs @ 12.14 hrs, Volume= 0.106 of Routing by Stor-Ind method, Time Span=4.00-27.00 hrs, dt=0.05 hrs Peak Elev= 1,021.50' @ 12.14 hrs Surf.Area= 3,556 sf Storage=4,423 cf Plug-Flow detention time=204.2 min calculated for 0.169 of(71% of inflow) Center-of-Mass def. time= 107.9 min ( 912.9- 804.9) Volume Invert Avail.Storage Storage Description #1 1,019.50' 8,590 cf Custom Stage Data (Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 1,019.50 751 0 0 1,020.00 1,546 574 574 1,021.00 2,937 2,242 2,816 1,022.00 4,187 3,562 6,378 1,022.50 4,660 2,212 8,590 Device Routing Invert Outlet Devices #1 Discarded 0.00' 0.600 in/hr Exfiltration over Horizontal area #2 Primary 1,021.20' 5.0' long x 2.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 2.85 3.07 3.20 3.32 Discarded OutFlow Max=0.05 cfs @ 12.14 hrs HW=1,021.49' (Free Discharge) t-1=Exfiltration (Exfiltration Controls 0.05 cfs) Primary OutFlow Max=2.04 cfs @ 12.14 hrs HW=1,021.49' (Free Discharge) 't2=Broad-Crested Rectangular Weir (Weir Controls 2.04 cfs @ 1.39 fps)