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<br />DRAINAGE CRITERIA MANUAL <br /> <br />/v G~"SS <br /> <br />/ <br />/ <br />/ <br />/ <br />.0 <br />.0 <br /> <br />.10 <br /> <br />- <br />I .08 <br />v <br />z <br />0 <br />I- <br />oCt <br />:;) <br />0 .06 <br />w <br />:I: <br />I- <br />~ <br />w .04 <br />(/) <br />:;) <br />a: <br />0 <br />u. <br />W <br />Q. .02 <br />0 <br />..J <br />(/) <br /> <br />FIGURE 4 - 1. <br /> <br />RUNOFF <br /> <br />S OR <br />C",,,~~E\.. , <br />~""UR"\.., I <br />~ I I 'Il,/c b",EC"S <br />C",,,~tlE\..S 0 <br /> <br />.02 .04 ' .06 .08 <br />MEASURED WEIGHTED DRAINAGEWAY SLOPE <br /> <br />.10 <br />(%) <br />ft. <br /> <br />SLOPE CORRECTION FOR NATURAL DRAINAGEWAYS <br /> <br />11-15-82 <br />URBAN DRAINAGE .. flOOD CONTROL DISTRICT <br /> <br />C'I~IIO-= '.:l <br /> <br />DRAINAGE CRITERIA MANUAL <br /> <br />RurlOFF <br /> <br />u <br /> <br />I <br /> EQUATIONS OF CURVE: BASIC EOUATlONS <br /> C, 2 bI. ( )'48 <br /> = aI. + + c lLe. <br /> lp = C, 'VSo <br />Eqn. a b c <br />1 .0 -.00371 .163 qp ~ 640 Cp <br />2 .000023 -.00224 .146 lp <br />3 -6 -4 <br /> 3.3x 10 ~8.01 " 10 .120 lp <br /> = TIME TO PEAK <br /> = hr. <br /> L = WATERSHED LENGTH <br /> = mi. <br /> Le. = DIST. TO CENTROID <br />'r\ = mi. <br /> So = WATERWAY SLOPE <br />\ = '~ <br /> I. <br /> .. <br /> " <br /> "" "'- <br /> ........ ~ <br /> ~ <br /> --- -,. <br /> " <br />EQn .1 Eqn.2 Eqn.3 <br /> I <br /> <br />0.18 <br /> <br />0.16 <br /> <br />0.14 <br /> <br />I- <br />Z <br />w <br />o <br />LI. 0.12 <br />LI. <br />w <br />o <br />o <br /> <br />0.10 <br /> <br />0.08 <br /> <br />.12 <br /> <br />0.06 <br />o <br /> <br />20 40 60 80 <br />PERCENT IMPERVIOUS - :t. <br /> <br />100 <br /> <br />FIGURE 4-2. <br /> <br />RELATIONSHIP BETWEEN Ct & IMPERVIOUSNESS <br /> <br />11-15-82 <br />URBAN DRAINAGE .. flOOD CONTROL DISTRICT <br /> <br />1:'1~11r")~ <br /> <br />A <br /> <br />9 <br />