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<br />Data for CENTERVILLE PROP DRAINAGE 10-24-00 <br />TYPE II 24-HOUR RAINFALL= 5.90 IN <br />Prepared by James R.Hill, Inc. <br />HydroCAD 5.11 000744 Ic) 1986-1999 Applied Microcomputer Systems <br /> <br />Page 3 <br /> <br />26 Oct 00 <br /> <br />SUBCATCHMENT 120 <br />PEAK= 33.55 CFS @ 12.05 HRS, VOLUME= 2.42 AF <br />ACRES CN <br />2.53 98 IMPERVIOUS <br />1.17 98 OPEN WATER <br />4.87 61 GRASS <br />8.57 77 <br /> <br />SCS TR-20 METHOD <br />TYPE II 24-HOUR <br />RAINFALL= 5.90 IN <br />SPAN= 0-40 HRS, dt=.l HRS <br /> <br />Method <br />DIRECT ENTRY <br />TR-55 SHEET FLOW <br />Grass: Dense n=.24 <br />DIRECT ENTRY <br />CIRCULAR CHAIlHEL <br />18" Diameter a~1. 77 <br />8=.005 'I' n=.013 <br /> <br />L=70' <br /> <br />Conunent <br />ROOF TO GROUND <br />Segment ID: <br />P2=2.7 in s=.02 'I' <br />GUTTER FLOW @ 3 FPS <br />Segment 10: <br />Pw=4.7' r=.375' <br />fps L=330' Capacity=7.4 <br /> <br />Tc {min} <br />2.0 <br />11.7 <br /> <br />2.3 <br />1.3 <br /> <br />sq-ft <br />V=4.2 <br /> <br />cfs <br /> <br />Total Length= 400 ft <br /> <br />Total Tc= <br /> <br />17.3 <br /> <br />SUBCATCHMENT 130 <br /> <br />PEAK= 37.13 CFS @ 12.09 HRS, VOLUME= 2.88 AF <br /> <br />ACRES <br />2.59 <br />.45 <br />9.62 <br />12.66 <br /> <br />CN <br />98 <br />98 <br />61 <br />70 <br /> <br />IMPERVIOUS <br />OPEN WATER <br />GRASS <br /> <br />SCS TR-20 METHOD <br />TYPE II 24-HOUR <br />RAINFALL= 5.90 IN <br />SPAN= 0-40 HRS, dt~.l HRS <br /> <br />Method Comment <br />DIRECT ENTRY ROOF TO GROUND <br />TR-55 SHEET FLOW Segment 1D: <br />Grass: Dense n~.24 L=85' P2=2.7 in 8=.02 'I' <br />SHALLOW CONCENTRATED/UPLAND FLOW Segment 1D: <br />Grassed waterway KY~IS L=14S' 5=.02 'I' V=2.12 fps <br />CIRCULAR CHANNEL Segment 1D: <br />18" Diameter a=1.77 sq-ft Pw=4.7' r=.37S' <br />8=.005 'I' n=.013 V=4.2 fps L=850' Capacity=7.4 cfs <br /> <br />Tc {min I <br />2.0 <br />13.6 <br /> <br />1.1 <br /> <br />3.4 <br /> <br />Total Length= 1080 ft <br /> <br />Total Tc= <br /> <br />20.1 <br />