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11586 SPENSA -ORONO -revised 5-28-09 Type 1124-hr 100 yr Rainfall=6.00" Prepared by{enter your company name here} Page 13 HydroCADO 8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 6/17/2009 Subcatchment 2P: PROPOSED Runoff = 1.10 cfs @ 12.02 hrs, Volume= 0.072 af, Depth> 5.64" Runoff by SCS TR-20 method, UH=SCS, Time Span=4.00-27.00 hrs, dt=0.05 hrs Type II 24-hr 100 yr Rainfall=6.00" Area (sf) CN Description 6,630 98 Paved parking & roofs 6,630 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.0 Direct Entry,Typical Inspection Subcatchment 2X: EXISTING Runoff = 1.05 cfs @ 12.03 hrs, Volume= 0.069 af, Depth> 5.47" Runoff by SCS TR-20 method, UH=SCS, Time Span=4.00-27.00 hrs, dt= 0.05 hrs Type II 24-hr 100 yr Rainfall=6.00" Area (sf) CN Description 1,140 85 Gravel roads, HSG B 5,490 98 Paved parking & roofs 6,630 96 Weighted Average 1,140 Pervious Area 5,490 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Typical Inspection Pond RAIN G: POND 1 Inflow Area = 0.977 ac, Inflow Depth > 4.63" for 100 yr event Inflow = 6.50 cfs @ 12.01 hrs, Volume= 0.376 of Outflow = 4.11 cfs @ 12.13 hrs, Volume= 0.213 af, Atten= 37%, Lag= 7.5 min Discarded = 0.06 cfs @ 12.10 hrs, Volume= 0.090 of Primary = 4.05 cfs @ 12.13 hrs, Volume= 0.123 of Routing by Stor-Ind method, Time Span=4.00-27.00 hrs, dt= 0.05 hrs Peak Elev= 1,023.34' @ 12.13 hrs Surf.Area=4,660 sf Storage= 7,760 cf Plug-Flow detention time= 249.3 min calculated for 0.213 of(57% of inflow) Center-of-Mass det. time= 141.4 min ( 933.4- 792.0)