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<br />!iY.dral:!.li~ <br />The U.S. Amy Engineers HEC-2 cCClpUter progriIll was used to pcrfom <br />water surface profile canputations. NLJllet'oos bridges and culverts exist <br />along the channels thrwgh the study reach. Dimensions for th<;se road <br />crossings """re dIoternined fran field investigations and the data was <br />integrated into appropriate cross section data. <br />Croos section data. and reach length information were obtained from <br />photograurnetric naps. Haps were pr<;pared especially for this study, <br /> <br />j,WJD PLAIN ~t."'1llrr <br /> <br />Potentialflooddarn.agestoexisti~devel~tandpossiblelossof <br />life can be alleviated or lessened through nonMstructural and structural <br /> <br />flood hawrd mitigation methods. <br />cronMstructural metlxx:is i.nclude: local flood plain fI.-'gulations, land <br />treatment, flOC>d waml~ and forecasti~ syst611s. flocxl insurance, flood <br />pruofi~, flood fighting and energency evacuations. <br /> <br />"'" <br /> <br />scale of I inch. 200 ft. with 2.0 it contour intervals. <br /> <br />Local Regulations <br />The need to minimize property damage due to flooding has been <br />recognized by planners and local catlllmity officials. Subdividers and <br />developers are required to suOOlit proposed stonn drainage plans to the <br />planning conmission for approval. In the past, drainage plans havt' been <br />prepared singularly or on a plat-by-plat basis. Information contained in <br />this report will be useful in developing a master drainage plan fur the <br />study area. This report provides the <Mtline of flocxl hazard area.'! m <br />large scale maps specifically for this purpoae. <br /> <br />Hydraulic roughness coefficients (Mannil18s N-Values) were determined <br />rrall field investigations and documented with photographs (in technical <br />addendun). A tabulation of rwghness coefficients is included in the <br />technical addendum. <br />Water surface profiles, typical cross sections and maps showing the <br />lOO-year flood boundaries are shown on included exhibits and flood plain <br />maps. Table I s~ canputed flood elevations at specific cross <br /> <br />sections. <br /> <br />usi~ stationing along the main channel as the location reference. <br />points were connected <md srooothed to create the [:lap flood lin~. <br /> <br />Thm <br /> <br />The city may provide :wnin,g regulations... <br />. ,. "to establish, regulate. restrict. and limit such uses 011 or <br />alot'lg any storm or floodwater I'U1off channel or basin, as sudl StoIlll or <br />fl=dwater nmoff channel or basin has been designated and <br /><lpproved by the COlorado Water COnservation Board. in order to lessen or <br />avoid the hazards to persons and damage to property resulting fran the <br />acCl%lnllation of storm or floodW!lters"... <br /> <br />Flood lines ,,"'Cre located or. t.'J.e J"..aps by tramlfen-ir>.g flood ~1,-,v8tiOl"E <br /> <br />(at map contour intervals) rrrn plotted profiles (frOll HEC-2) to the maps, <br /> <br />asstatcd inSectionJO-2!1-IU for COlIntygovenJllents andSectiona <br />jl-2j~301 for mll1icipal r,OYerrt1l€nts of the Colondo Revisod Statut..,._ <br /> <br />15 <br /> <br />16 <br />