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<br />, <br /> <br />DRAINAGE CRITERIA MANUAL <br /> <br />RUNOFF <br /> <br />. <br /> <br /> <br />~ 0.75 Qp <br />o <br />.., <br />u. <br /> <br />. <br /> <br />0.5 Qp <br /> <br /> <br />o <br /> <br />'EFFECTIVE RAINFALL = 1 INCH IN tu <br /> <br />(2) <br /> <br />(1) 0.35 X (WIDTH @ 50%) OR <br />0.6 Tp, WHICHEVER IS LESS <br /> <br />(2) 0.45 x (WIDTH ~ 75 %) OR <br />0.424 Tp IF 0.6 Tp FOR <br />(1) IS USED <br /> <br /> <br />(1 ) <br /> <br />ADJUST RECESSION LIMB <br />UNTILL A UNIT HYDRO GRAPH <br />VOLUME IS ACHIEVED ( :t 5 % ) <br /> <br />WIDTH @ <br />50 % Qp <br /> <br />ASSUMED SHAPE <br /> <br />FINAL SHAPE <br /> <br />........ <br />"- <br />........- <br /> <br />Tp <br /> <br />TIME <br /> <br />FIGURE 4-5 <br /> <br />I <br />I <br /> <br />. <br /> <br />UNIT HYDROGRAPH <br /> <br />5 -1-84 <br />URBAN DRAINAGE & FLOOD CONTROL DISTRICT <br />