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3850 Watertown Road
<br /> 3850 Watertown Road Type 1124-hr 100-YR Rainfal1=7.27"
<br /> Prepared by Sunde Engineering, PLLC. Printed 1/6/2015
<br /> HydroCAD�10.00 s/n 02350 �2013 HydroCAD Sofiware Solutions LLC Page 9
<br /> Area (sfl CN Description
<br /> * 76,065 98 Impervious
<br /> 19,840 85 Gravel roads, HSG B
<br /> 580,635 69 Pasturelgrassland/range, Fair, HSG B
<br /> 87,908 60 Woods, Fair, HSG B
<br /> 131,542 79 50-75% Grass cover, Fair, HSG C
<br /> 855,990 72 Weighted A�erage
<br /> 819,925 91.51% Pervious Area
<br /> 76,065 8.49°r6 impervlous Area
<br /> Tc Length Slope Velocity Capacity Description
<br /> (min) (feet) (ft/ft} {fUsec) (cfs)
<br /> 20.0 Direct Entry,Assumed
<br /> Summary for Subcatchment 12S:
<br /> Runoff - 92.31 cfs Q 12.13 hrs, Volume= 6.959 af, Depth= 4.06'
<br /> Runoff by SCS TR-20 method, UM=SCS, Weighted-CN, Time Span= 0.00-72.OQ hrs,dt= 0.05 hrs
<br /> Type II 24hr 100-YR Rainfall=7.27"
<br /> Area(sfl CN Dsscription
<br /> * 76,065 98 Impervious
<br /> 19,$40 85 Gravel roads, HSG B
<br /> 580,635 68 Pasture/grassland/range, Fair, HSG B
<br /> 87,908 60 Woods, Fair, HSG B
<br /> 131,542 79 50-75% Grass cover, Fair, HSG C
<br /> 895,990 72 Weighted Average
<br /> 819,925 91.51°10 Pervious Area
<br /> 76,065 8.49% {mpervious Area
<br /> Tc Length Slope Velocity Capacity Description
<br /> (min) (feet) (fUft) (f�lsec) (cfs)
<br /> 2Q.0 Dlrect Entry,Assurned
<br /> Summary for Pond 1 P: Existing no Draintile
<br /> {r�flow Area = 20.569 ac, 8.49�o Impervious, Ir�flow Depth = 4.06" for 100-YR event
<br /> Ir�ffow = 92.31 cfs � 12.13 hrs, Volume= fi.959 af
<br /> Outflow - 0.00 cfs (c� 0.00 hrs, Volume= 0.400 af, Atten= 100%, Lag= 0.0 min
<br /> Primary = 0.00 cfs @ 0.00 hrs, Volume= 4.000 af
<br /> Routing by Stor-Ind method,Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
<br /> Starting Elev= 995.95' Surf.Area=4,920 sf Storage=692 cf
<br /> Peak Elev= 1,001.24' �25.15 hrs Surf.Area= 121,365 sf Storage= 303,832 cf (303,14a cf above start}
<br /> Plug-Flow detention time= (not calculated: initial storage exceeds outFlow)
<br /> Center-of-Mass det. time= (not calculated: no outflaw)
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