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Z:\HydroCAD\HCDATA\MBB\ As Built <br /> 11586 SPENSA- ORONO -revised 10-28-09 Grout Riprap Type 1124-hr 2 yr Rainfall=2.80" <br /> Prepared by Anderson Engineering of MN LLC Page 4 <br /> HydroCAD®8.00 sh 000837 ©2006 HydroCAD Software Solutions LLC 10/29/2009 <br /> Routing by Stor-Ind+Trans method, Time Span=4.00-27.00 hrs, dt= 0.05 hrs <br /> Pond RAIN G: POND 1 <br /> Inflow Area = 0.977 ac, Inflow Depth = 1.64" for 2 yr event <br /> Inflow = 2.41 cfs @ 12.01 hrs, Volume= 0.134 of <br /> Outflow = 0.12 cfs @ 13.48 hrs, Volume= 0.071 af, Atten= 95%, Lag= 88.0 min <br /> Discarded = 0.04 cfs @ 13.48 hrs, Volume= 0.058 of <br /> Primary = 0.07 cfs @ 13.48 hrs, Volume= 0.013 of <br /> Routing by Stor-Ind method, Time Span=4.00-27.00 hrs, dt= 0.05 hrs <br /> Peak Elev= 1,021.23' @ 13.48 hrs Surf.Area= 3,225 sf Storage= 3,527 cf <br /> Plug-Flow detention time= 376.7 min calculated for 0.071 of(53% of inflow) <br /> Center-of-Mass det. time= 261.4 min ( 1,082.7- 821.3) <br /> Volume Invert Avail.Storage Storage Description <br /> #1 1,019.50' 8,590 cf Custom Stage Data(Prismatic) Listed below(Recalc) <br /> Elevation Surf.Area Inc.Store Cum.Store <br /> (feet) (sq-ft) (cubic-feet) (cubic-feet) <br /> 1,019.50 751 0 0 <br /> 1,020.00 1,546 574 574 <br /> 1,021.00 2,937 2,242 2,816 <br /> 1,022.00 4,187 3,562 6,378 <br /> 1,022.50 4,660 2,212 8,590 <br /> Device Routing Invert Outlet Devices <br /> #1 Discarded 0.00' 0.600 in/hr Exfiltration over Horizontal area <br /> #2 Primary 1,021.20' 5.0' long x 2.0' breadth Broad-Crested Rectangular Weir <br /> Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 <br /> 2.50 3.00 3.50 <br /> Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 <br /> 2.85 3.07 3.20 3.32 <br /> Qiscarded OutFlow Max=0.04 cfs @ 13.48 hrs HW=1,021.23' (Free Discharge) <br /> 1=Exfiltration (Exfiltration Controls 0.04 cfs) <br /> Primary OutFlow Max=0.07 cfs @ 13.48 hrs HW=1,021.23' (Free Discharge) <br /> L2=13road-Crested Rectangular Weir (Weir Controls 0.07 cfs @ 0.44 fps) <br />