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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4- 0.14 <br />U <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 />0.18 <br /> <br />0.16 <br /> <br /> Equations of Curve Basic Equations <br /> Ct= al;+blatc t = C ELLCaj 0.48 <br /> p t vso. <br /> Eqn. No. a b c 640 Cp <br /> I 0.0 -0.00371 0.163 qp= <br /> 2 0.000023 0.00224 0.146 tp <br />\ 3 3.3.10-6 -8.01.10-4 0.120 Where, <br /> tp= time to peak - hrs. <br /> L = watershed length-m' <br /> Lca = dist.to centroid-mi. <br /> So = waterway slope-ft/ft <br /> 1\ <br /> \ <br /> "" <br /> "'- , <br /> ....... ............ <br /> i'-..... <br /> -- - <br /> - <br />Eqn.l Eqn.2 Eqn.3 <br /> <br />It) 10 <br />- <br />0 <br />~ <br />-let <br />......... <br />~ <br />~I- 8 <br />uU <br />......... <br /> II <br /> a.. <br /> I <br /> a:: <br /> W 6 <br /> I- <br /> W <br /> ~ <br /> <( <br /> a:: <br /> ~ 4 <br /> C> <br /> Z <br /> - <br /> ~ <br /> <( 2 <br /> W <br />a.. <br /> <br />0.06 <br />o 20 <br /> <br />40 <br /> <br />60 <br /> <br />80 <br /> <br />100 <br /> <br />12 <br /> <br /> Equations of Curve / <br /> p:= al:+ bl.+ c <br />f-- /' <br /> EQn. No. a b c <br /> I 0.002450 -0.0120 2.'6 / <br />I-- 2 - 0.00091 0.228 -2.06 / <br /> / <br /> V <br /> / <br /> V <br /> / <br /> 1/ <br /> J <br /> / <br /> / <br />--' /. <br /> Eqn.l Eqn.2 <br /> <br />i <br />I <br />f <br /> <br />o <br />o <br /> <br />FIGURE I <br /> <br />IMPERVIOUS - % <br />- RELATIONSHIP BETWEEN <br />Ct AND IMPERVIOUSNESS <br /> <br />40 60 <br />IMPERVIOUS-% <br />FIGURE 2 - RELATIONSHIP BETWEEN PEAKING <br />PARAMETER AND IMPERVIOUSNESS <br /> <br />URBAN DRAINAGE AND FLOOD CONTROL DISTRICT <br />FLOOD HAZARD AREA DELINEATION <br />DOUGLAS COUNTY <br /> <br />Jack G. Raub Company <br />~&"""'" <br /> <br />20 <br /> <br />80 <br /> <br />100 <br /> <br />I <br /> <br />RELATIONSHIP BETWEEN (I) TIME TO PEAK <br />COEFFICENT (Ct) AND (2) PEAKING PARAMETER (P) WITH <br />PERCENT IMPERVIOUSNESS <br /> <br />PAGE 5 ' <br />. <br />