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<br /> <br />1r<TRODllCTION <br /> <br />e~onomi~ dam~g~s. The ~on~ept of the flood plain and degree of flood <br /> <br />The first attempt to lay o~t a toO'n site of 640 acres at Denver <br /> <br />risk is ill~strated by the sketch in Figure 1. Following is a list of <br /> <br />waS made in 1858. By 1960, metropolitan Denver had grown in sraa to <br /> <br />definitions of other techni~al terms ~ed in this report. <br /> <br />164,000 acres of \lrbnhed hoo. It is snticipated that by the yesr <br /> <br />C.f.s. (c\lbic feet per second). A meaS\lre of the volume of water pessing <br />a specified section of the channel and/or floodO'ay per unit of time. <br /> <br />2000, l.lrbanizedlandinOletropolitanDenver..1l1 total 375,000 acres. <br /> <br />To plan effectively for the fl.lt\lre and avoid the hazsrds ~f floods, <br /> <br />.' <br /> <br />community plsnners must have information on flood potentials and sreaa <br /> <br />Flood Freql.lency. (See Probabll1ty.) Theaveragerecurrenceintervelof <br /> <br />.' <br /> <br />subject to flooding. This report Sl.lmmarizes Volume I of the Denver <br /> <br />specific discharges or vater stages whiCh cause flooding. <br /> <br />metropolitan region flood plain i~ormation report, which presents <br /> <br />Flood Proofin~. A combination of structural changes and adjl.lstments to <br /> <br />detailed 'information for the South Platte River from weterton, Colorado, <br /> <br />properties s\lbject to flooding, pr:marily for the redl.lction or elimination <br />of flood damages. <br /> <br />to Brighton, Colorado. Copies of Volume I, which has been published in a <br /> <br />limited qu~ntity. sre on file in the office of the District Engineer, <br /> <br />V. $. Army Engineer District, Owah~, Nebrsska; the Inter~County Regional <br /> <br />Maximum ProbAble Flood. A potenti~l flood v1th the highest discharges <br /> <br />Planning Commission, Denver; and the Colorado Water Conservation Bo~rd, <br /> <br />and r~noff volume to be expected from the most critical combination of <br /> <br />Doon"'er; ~nd ~re available for inspection. Flood plain i~ormat1on <br /> <br />meteorologic and hydrologic conditions reasonably capable of ~currence <br /> <br />regarding tributary streams in the metropolitan areS ..ill be p~blished <br /> <br />in the region. <br /> <br />aa the pert1nent studies are completed. <br /> <br />Probability. <br /> <br />. <br />The ann\lal chance of OCCl.lrrenCe of specific hydrologic <br /> <br />of the chsanel. In terms of risk, the extent of flooding on the plain <br /> <br />. <br /> <br />events, s~ch 8S rainfall over e specified arCa or peak disch~rge at a <br />specified location expressed in percent, e.g., 5' representing One ch~nce <br />in 20 of the event occurring in any year or an average reCl.lrrenCe of once <br />in twenty years. <br /> <br />DEFINITIONS <br /> <br />, <br /> <br />The flood plain is the are~ ~djacent to the mormal channel of a <br /> <br />stream vhich is s~bject to flooding vhen stream flow exceeds the capacity <br /> <br />vnrice fre", thc extrc:::e li:::ite or noodif'-& rC9u.lting frO<!! the (Il~:d,"\l1'n <br /> <br />repr.."..nta a thrc~t of ""re occurrence, floods within the r"~e of 5-year <br /> <br />St~ndard Project Flood. A hypothetical flood, estimated by the COrps of <br />Engineers, representing the critical runoff volume Hod peak discharge <br />O'hich may be expected from the most severe combi.~tion of meteorologic <br />and hydrologt~ ~onditlons considered to be reasonqbly chqrActerl~tic of <br /> <br />probable stream dis~h~rge to be expe~ted, to limit~ based on flood <br /> <br />stages of frequent occ~rrence. Thus, "h11e the m"ximum probable flood <br /> <br />to lOO-ye8r average rec~rrence frequency represent risks of repe8ted <br /> <br />2 <br />