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Buhman Culvert Type 1124-hr 100-Year Rainfall=7.28 <br /> Prepared by Civil Methods, Inc. Printed 9/26/2014 <br /> HydroCAD@ 10.00-12 s/n 07283 @ 2014 HydroCAD Software Solutions LLC Paae 5 <br /> Summary for Subcatchment 1S: Culvert Watershed <br /> Runoff = 27.90 cfs @ 12.41 hrs, Volume= 3.156 af, Depth> 2.51" <br /> Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs <br /> Type II 24-hr 100-Year Rainfall=7.28" <br /> Area (ac) CN Description <br /> 10.140 55 Woods, Good, HSG B <br /> 4.950 70 Woods, Good, HSG C <br /> 15.090 60 Weighted Average <br /> 15.090 100.00% Pervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ft/ft) (ft/sec) (cfs) <br /> 22.7 100 0.0200 0.07 Sheet Flow, <br /> Woods: Light underbrush n= 0.400 P2= 2.86" <br /> 3.0 200 0.0500 1.12 Shallow Concentrated Flow, <br /> Woodland Kv= 5.0 fps <br /> 15.2 250 0.0030 0.27 Shallow Concentrated Flow, <br /> Woodland Kv= 5.0 fps <br /> 1.2 800 0.0600 11.27 248.02 Trap/Vee/Rett Channel Flow, <br /> Bot.W=3.00' D=2.00' Z= 4.0 '/' Top.W=19.00' <br /> n= 0.035 <br /> 42.1 1,350 Total <br /> Summary for Pond 2P: Culvert <br /> Inflow Area = 15.090 ac, 0.00% Impervious, Inflow Depth > 2.51" for 100-Year event <br /> Inflow = 27.90 cfs @ 12.41 hrs, Volume= 3.156 of <br /> Outflow = 27.90 cfs @ 12.41 hrs, Volume= 3.156 af, Atten= 0%, Lag= 0.0 min <br /> Primary = 11.43 cfs @ 12.41 hrs, Volume= 2.458 of <br /> Secondary = 16.47 cfs @ 12.41 hrs, Volume= 0.698 of <br /> Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs <br /> Peak Elev= 962.35' @ 12.41 hrs <br /> Device Routing Invert Outlet Devices <br /> #1 Primary 959.20' 18.0" Round Culvert <br /> L= 24.0' CMP, end-section conforming to fill, Ke= 0.500 <br /> Inlet/ Outlet Invert= 959.20' / 958.90' S= 0.0125 '/' Cc= <br /> 0.900 n= 0.024, Flow Area= 1.77 sf <br /> #2 Secondary 962.00' 30.0' long x 15.0' breadth Broad-Crested Rectangular Weir <br /> Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 <br /> Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 <br /> tririmary OutFlow Max=11.43 cfs @ 12.41 hrs HW=962.34' (Free Discharge) <br /> 1=Culvert (Barrel Controls 11.43 cfs @ 6.47 fps) <br /> Secondary OutFlow Max=16.37 cfs @ 12.41 hrs HW=962.34' (Free Discharge) <br /> r-2=Broad-Crested Rectangular Weir (Weir Controls 16.37 cfs @ 1.58 fps) <br />