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<br />" <br />I <br /> <br />CHAPTER [ <br />INTRODUCTION <br /> <br />Therefore, upon official approval of this report by the Colorado <br />Water Conservation Board, the areas described as being within the <br />lOO-year flood (1% ohance Elood)* can be designated as flood ha.ard <br />areas and their use regulated accordingly by the local agencies. <br /> <br />A. Authorization <br /> <br />This study was authorized by the City of Longmone in cooperation ~ith <br />Boulder County and the Colorado Water Cot\servation Board. Specific tasks <br />were performed according to the terms of the contract dated February 15, <br />1979, between Colorado Water Con.ervation Board and Water Resources <br />Consultants, Inc. <br /> <br />B. Purpose and Scope <br /> <br />" . . . to utabfuh, lr.egu..tM:e., -\uu-ic.t, wui t.imU ~h <br />lUlU 01\ Oft a.{0I1.9 anI! 4tOJ!m M ~loodw:t.tVt ItWloH channl!J. 0"- <br />bWI1., .u m.ch ~ta4m 04 ~t:OO~eA 4l.moH chanl1.e.t 1M bM.(>t <br />hM beendwg>>.a.ted <lild a"pilovedblJtite CO.tMwlOWa.tu Con- <br />~eAva.t.i.on Bo<V!d,.(/'I 04dvt Ui .te-uen M avo.(d .the hazWld.. to <br />pM.60M <tiId d~e t.o (VlOpMh) "e..w.U,mg 6!(Gm till!. ac.cumu.la- <br />tiCI'! Ot ~to~m OJ!. 6ioodwatM~ . . . n <br /> <br />The purpose of this study is to determine the potential area of <br />flooding along St. Vrain Creek and to recommend a feasible and practical <br />plan fOt control of flooding in the teach within the study area. The <br />specific location of the study reach is shown in Figure-I. Th~ flood- <br />plain infor~ation provid~d in this r~port will b~ us~d by the local <br />agencies to regulate the land uSe of areas within the floodplain and <br />ehus reduce future damages. I~ple~entation of the recowmend~d plan for <br />drainage i~provements for the study reach will furth~r r~duce da~ages to <br />~xisting populat~d areas. <br /> <br />The cities, incorporsted to~ns, and counti~" ~itnin the study ar~a <br />may ptovide ~oning r~gulations: <br /> <br />Th~ &COp~ of thE study includes the tollo~ing items: <br /> <br />1. M~et with representatlves of the City of Longmont, Bouldet County, <br />as stated in Section 30-28-111 for ~ne ~ounty governments and Section 31- the Colorado Water Conservation Board and oth~r public and private <br />23-210 for municipal ~overnments of th~ Colorado Revised Statutes 1973. agencies for basic information and data collection. <br /> <br />The Colorado Water Conservation Board has the po~er and duty: <br /> <br />t. Revie~ existing information and data related to the study reach <br />and conduct the necessary field surveys. <br /> <br />" , . , 1.0 dev,we IlJ1d ~Mmula.t.e met.hoM, meaM and. ,,~ <br />6M M-tllg,IJtg ",bout: .the g!tea.teA UUUZatiOOl 06 the wrt<<<I 06 <br />the <lta.t.e <tiI.d the pilevCi!.uol1. 06 6lood damagu. t.h<V!e&tom and <br />to du,.(glUl.te and a."(Vlove <It.o!(m OJ!. 6loocW!a.IJ !(U:l1.o~6 chWlneu <br />0.... bMW, Md to mAAt <lUch dv,.(gl1<l.tionA (tv(l.{labi:e t:o leg.(.6- <br />fuUve bodi.u, o~ cU.(.f/..6 <lild lI.l1..(nco!tF)Ma,.ted t.o......1-I; -t.a cou.ntJ.j <br />ptamung co"",.i4.I,.(oI1<l; and to bO<Vld", 1)6 adjlVJtmentJ, c~ eill.....; <br />-U:COIt"o!tatedtOl<!>W; and. COt.tIlUCJ, 00 ,thw6We " <br /> <br />). Document the flood history of St. Vrain Creek. <br /> <br />* The t~nl "u Chance Flood," "l"termediate Regional Flood," and "lOO-Y~ar <br />Frequen~y Flood" can be used interChangeably as tney are defined by the <br />."",e typa of flaod event (see Glossary). Ho~~ve., for COOSlstenCy, ~h.rc- <br />ever pouible, the term "IOO-Year HOOd" will be used in this report. <br /> <br />as stated in Section 37-60-106(1)(c) of the Colorado Revised Statutes 1973. <br /> <br />-I- <br /> <br />+ <br />