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<br />. <br /> <br />; <br /> <br />SUGGESTED PROCEDURES <br />FOR " <br />FLOODWAY DESIGN <br /> <br />o S:ep 1 <br /> <br />Coordinate \,"ith all interested agencies, especially the local <br />gonmcent, to determine the conditions that dictate floodways that <br />yary fyo:J the star,eard. <br /> <br />C." c:....co" ? <br />.- ~ L,,--,-, ... <br /> <br />K~ the natural flood profiles through the study reach. <br /> <br />C c - <br />, _ tep j <br /> <br />a. 3)' inspection of the natural profiles, consider el~~inating <br />fro~ further analysis those reaches wher~ the lOa-year velocity is <br />excessive and those reaches where higher order floods would likely <br />result in loss of life or catastrophic damages if fringe areas were <br />developed. <br /> <br />b. El~inate from further analysis, those reaches where the <br />local, Federal, or state requirements forbid encroach~ent. Coordinate <br />this v;i tn the apprcpriate GTI-! for Flood Insurance Studies. <br /> <br />o Step 4 <br /> <br />a. Using HEC-2 ('lethod 4, 5, or 6) run the floodway (1.00 foot <br />surcharge aDd equal conveyance) for the remaining reaches. <br /> <br />b. Che ck for excessive velocities and adjust the width accordingly. <br />c. Check for excessive surcharge (in excess of 1. 00 foot) . <br />d. Adjust +-h::::. flooal,ay to obtain a smooth alignment. <br />L. ~..... <br />e. Adjust the floodh:ay to meet local requirements. <br /> <br />I. Adjust the floodway so that it is implementable (\.n1iform <br />width, etc. along short stream reaches). <br /> <br />g. Adjust the floadway to meet local min:iJnum width requirements. <br /> <br />G Step 5 <br /> <br />a. Rerun the floodl,ay using HEC-2 (fjethod 1) based on adjustments <br />from Step 4. <br /> <br />b. Repeat Step 4, if nece~sary. <br /> <br />c: S:(:;, :::' <br /> <br />I':"2'::-::":-.: Li~2 :lc,c~".':2:\' to all interested agencies 2J1d C2}~.2 <br />-:~,~-::i::ic:-:2..1 3.cju:::t:--:-.::-:-:t:::, if necessary. <br /> <br />9 <br />