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<br /> <br />I <br /> <br />AREAS ClF POTI::'T!AL FLOCOTY; <br /> <br />, <br /> <br />GUIDS LINES TO FLOOD PLAn( USE <br />'While the objective of flood plain Inform~tion is to foster optlm~ <br />and pr~dent uSe of the river valley, occup~tlon of the flood plain is <br />always subject to nature's prior claim for passage of periodic floods. <br />To ignore this claim 1s to invite economic toll such ss 1s illustrated <br />by the scenes presented 1n Figures 5 and 6. These floods have occurred <br />1n various Bress of the South Platte River be sin. One roay conjecture <br />thet the victims of these floods Vers either completely ~Vere of the <br />floodhszsrd, Or chose to ignore it ss being remote or improbeble. III <br />either case, they end their community geia little comfort from the feet <br />thetittllsyhsY"beellu.ll"Xpeetedorrllre. <br /> <br />, <br /> <br />The ett~chcd m~ps, uUIT.bared Sheets 1 to I), 1l1"strote ~r"as sl.lb.)ect <br />to flooding in th~ f~ocd pl~i~ of the South Platte River f~orn ~~terton to <br />Brighton, Colorado. n,ree coai1tiotls of pote:!t1,,~ flooding ~re 1l1,,~trated <br />~nl identified io the rn~p legen.i: (1) Floed dtsch~rge3 e:;'cli'lnlent to H <br />specific flood dhch~rge \lhich occl.lrrei previol.lsly, scleh "s the ,"""y 1942 <br />flood And the May 19~7 flood. This flood ~"tline ie bnsed on existing <br />conditions of the ch~nn"l Md flood pl~in; (2) "lOO-ye~r Frequency Flood" <br />representing disch~rges thot h~vc ~ probnbility of occurrence in qny o~e <br />ye~r of one percent; (3) "Stond"rd Project Flood" representing dl.seh~rges <br />of qpproxi~~tely 40 pereent of the m?ximclm proboble dischRrge potenti~l of <br />the ~.otershed. The St~nd~rd f'ro.'ect flood o,,,t1in~ 16 suit.oble for else ns <br />~ guide to the flOoding limits ~hich mny be expected ~hen fut~re urbani?R. <br />tion incre8ses runoff from the ~~tershed. <br /> <br />, <br /> <br />USE OF FLOOD OOTI..lNES <br /> <br />Prl.ldent usc of the flood plain ~ust represent a careful b~lence <br />bet~een essentiel community requirements and the economic cost of flood <br />dameges. To minImize potenti~l flood damages, else of the flood pl~ln <br />shoelld, ~herever possible, be restrieted to CAtegorie~ of community needs <br />~hich can sl.lstein flOOding ~ith e ~inlmum of eeoaomie demage. CCff.~unity <br />re~uire~ents in this cetegory may include perks, greenbelt areaS or <br />p~rking lots and ro~d~~Y8. Under certain conditions, higher economic <br />use of the flood plein may be feasible 1f ~dequnte floodproofing of <br />struct>.lrce is mede a rCQ>.lirement of flood plain oe"elp~tion. en re"ches <br />~here encro~~hment already exists, ch~nnel e~lergements or modif1c~tion <br />of flo~-reterdi~ 6tructures may be the most prRctic~l me~ns of for~- <br />st~l~ing future flood ds~~gea. Conversion of flood Selsc~ptiblc are~$ to <br />llrban llses ..hich c"n sustain flooding ~ith less "conocnic da"",ges offers ... <br />sl.l1t~bl~ al t",rn"tiv" in 50<0" casee, ~nd in other cases constru~tion of <br />f~OOd control \lorks m'lV h~ ~"nn'""i~~llv fCAsible. <br /> <br />I <br /> <br />Th" flood outline" presented in this report "re b~sed On di"ch~rge <br />;>otenti~ls deri',,,d from ~n81ysis of h1stnric dlschlirg" records, ~"d on <br />the existing dimensions of the chanael ~nd flood plain. Eo~ever, runoff <br />pstterns are subje~t to "hnnge b~equse of ~~tershed developOlcnt. Limits <br />~~y ~lao v~ry in the futllre lf ~hnn~~s in the ch~nnel ~nd flood pl~in <br />occ~r. With such potential ch~nges, the flood o~tlines ~re esscntl~lly <br />refer~n~~ li~~~ fur d"ter~iniag the aegree of flOOd ris~. Appllcntions <br />to 3pe~if1" loc~tions sho~ld be mBde ~ith fell1 re~ognition of the potenti~l <br />Y"ri~tions and the more det~11ed Inform~tion presented in the full report. <br /> <br />7 <br /> <br />8 <br /> <br />I <br />