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~ 0-S <br />:,~i.~r. <br />iF... <br />a ;' <br />,;:.,, <br />~. <br />:tiw'. -. <br />Swt .'.''+ ~ . <br />(:~ ,~ <br />~.~ i <br />~~~-' - <br />. <. <br />n`,3r~'••~~ <br />~~``~++3; . i <br />P~ `l;'i~ <br />~-± <br />pl,.~~, ,.. ,( - - <br />~.:' ' a <br />t,~i°,,~, .~ <br />;r= .- <br />ny'.: <br />4 _.__. <br />,{ <br />~f <br />;, <br />i <br />Y ]- , <br />:1. r <br /> <br />Worksheet 2: Runoff curve number and runoff <br />Pra~ect d V'/_ gy _ Date <br />Locatlan (,/ - s Checked Date <br />CLrele one: Present Developed <br />!. Runoff curve member (CN) ,O p, J! <br />Soil acme <br />and Cover deaeripeion <br />CN ~ Area Product <br />of <br />hydrologic <br />group <br /> <br /> <br />(appendix A) (cover type, treatment, and <br />hydrologic condition; <br />pereeat imperviaua; <br />unconnected/eoaaeeted impervious <br />area ratio) r <br />r <br />o <br />p <br />EiO, <br />`i <br />N <br />~ <br />p'a, <br />Y <br />N <br />eo <br />W ~ <br />~ae~rea <br />^ mi-~~ <br />(] x CA :area <br />7orr;ul) ~ 80 ~•:3 ~~~ <br /> <br /> <br /> <br /> <br /> <br /> i. <br />1/ Uae only one CN source per line. Sotale - ~r.3 ~ g <br /> <br />CN (velghted) ~ total ocoduct ~ f$y ~ $ O Uae Q7 ~ 6 O, <br />total area <br />2.3 ~ ;. <br />2. Aunoff <br />Frequency .............................. yr <br />Rainfall, P (24-hour) .................. to <br />Aunoff, Q in <br />.............................. <br />(Use P and CH vlth table 2-1, fig. 2-1, <br />ar eqa. 2-3 and 2-4,) <br />Storm /1 Storm /2 Storm !3 <br /> <br />z.~ <br />/, 0 ` <br />(21Q-VI-TR-S5. Second Ed-, Sune 1986) <br />D•2 <br />