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C:�Program Files�FiydroCAD�Projects�-IydroCAD ProjectsW8 JOBS\ <br /> 08175B Barry Sewall Proposed Conditions Type 1124-hr 100 Year Rainfa11=6.00" <br /> Prepared by Gronberg &Associates, Inc. Page 15 <br /> HydroCAD�8.00 s/n 004529 �2006 HydroCAD Software Solutions LLC 11/13/2008 4:11:13 PM <br /> Area (ac) CN Description <br /> 0.170 98 Paved parking 8 roofs <br /> 0.110 98 Paved parking&roofs <br /> 0.110 98 Paved parking&roofs <br /> 0.650 61 >75%Grass cover, Good, HSG B <br /> 0.360 55 Woods Good HSG B <br /> 1.400 70 Weighted Average <br /> 1.010 Pervious Area <br /> 0.390 Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ff/ft) (ft/sec) (cfs) <br /> 12.0 Direct Entry, <br /> Pond D1: Depression <br /> Inflow Area= 1.�0 ac, Inflow Depth> 1.65" for 100 Year event <br /> Inflow = 2.86 cfs a� 12.03 hrs, Volume= 0.146 af <br /> Outflow = 0.41 cfs a� 12.51 hrs, Volume= 0.073 af, Atten= 86%, Lag=28.8 min <br /> Primary = 0.41 cfs a� 12.51 hrs, Volume= 0.073 af <br /> Routing by Stor-Ind method, Time Span=5.00-20.00 hrs, dt=0.05 hrs <br /> Peak Elev= 948.12'� 12.51 hrs SurF.Area= 0.092 ac Storage= 0.074 af <br /> Plug-Flow detention time= 183.5 min calculated for 0.073 af(50% of inflow) <br /> Center-of-Mass det. time= 92.8 min (906.9-814.0) <br /> Volume Invert Avail.Storage Storage Description <br /> #1 947.00' 0.330 af Custom Stage Data(Prismatic) Listed below(Recalc) <br /> Elevation Surf.Area Inc.Store Cum.Store <br /> (feet) (acres) (acre-feet) (acre-feet) <br /> 947.00 0.040 0.000 0.000 <br /> 950.00 0.180 0.330 0.330 <br /> Device Routing Invert Outlet Devices <br /> #1 Primary 948.10' 66.0'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 2.50 <br /> 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 2.85 <br /> 3.07 3.20 3.32 <br /> Primary OutFlow Mau=0.34 cfs a� 12.51 hrs HW=948.12' (Free Discharge) <br /> '�t=Broad-Crested Rectangular Weir (Weir Controls 0.34 cfs a�0.32 fps) <br />