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<br />DRAINAGE CRITERIA MANUAL <br /> <br />RUNOFF <br /> <br />. <br /> <br />0.18 <br /> <br /> EQUATIONS OF CURVE: BASIC EQUATIONS <br /> Ct aI2 bIa ( )"48 <br /> = + + C LLea <br /> a tp <br /> = Ct 'VSo <br /> Eqn. a b C <br /> 1 .0 -.00371 .163 qp = 640 Cp <br /> 2 .000023 -.00224 .146 tp <br /> 3 -6 8.01X1~ <br /> 3.3x10 .120 tp TIME TO PEAK <br /> = <br /> = hr. <br /> L = WATERSHED LENGTH <br />\ = mi. <br />-, Lea = DIST. TO CENTROID <br /> \ = mi. <br /> So = WATERWAY SLOPE <br /> \ = ';ft <br /> t. <br /> '" <br /> "- "-- <br /> ........ ............... <br /> r----. <br /> --. t-... <br /> - <br />Eqn.1 Eqn.2 Eqn. 3 <br /> I <br /> <br />0.16 <br /> <br /> 0.14 <br /> cJ' <br /> I- <br /> Z <br /> W <br /> U 0.12 <br /> LL <br /> LL <br /> W <br /> 0 <br />. U <br /> 0.10 <br /> <br />0.08 <br /> <br />0.06 <br />o <br /> <br />20 40 60 80 <br />PERCENT IMPERVIOUS - Ia <br /> <br />100 <br /> <br />FIGURE 4 - 2. <br /> <br />RELATIONSHIP BETWEEN Ct & IMPERVIOUSNESS <br /> <br />. <br /> <br />5~1~84 <br /> <br />URBAN DRAINAGE & FLOOD CONTROL DISTRICT <br /> <br />jl <br />