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<br />CHAPTER I <br /> <br />INTRODUCTION <br /> <br />Authorization <br />Purpose and Scope <br />Aoknowledge~ents <br /> <br />TABLE OF CONTENTS <br /> <br />CHAPTER II <br /> <br />STUDY AREA DESCRIPTION <br /> <br />CHAPTER III - FLOODING PROBLEMS <br /> <br />History of Flooding <br />Ca"ses of Flooding problems <br /> <br />CHAPTER IV <br /> <br />HYDROLOGIG ANALYSIS <br /> <br />CHAPTER V <br /> <br />HYDRAULIC ANALYSIS <br /> <br />EXHIBIT I <br /> <br />COAL CREEK IMPROVEMENTS AND THEIR <br />PRELIMINARY COSI <br /> <br />G"neral <br />Reoo~endad Impro.c=ants <br /> <br />Reach I <br /> <br />Reaoh n <br />RellchIII <br />RellohlV <br />ReaohV <br />Reach VI <br />Reach VII <br />Resch.III <br /> <br />From Confluenoe of Coal Creek with <br />Slate River to Station 41+84 <br />Station 41+64 to Station 44+49 <br />Station 44+49 to Station 46+20 <br />Station 48+20 to Station 50+00 <br />Station 50+00 ~o S~8tion 50+75 <br />Station 50+75 to Station 52+82 <br />Station 52+82 to Station 59+49 <br />StHthm 59+49 tc St"ticr. 54+19 <br /> <br />Preliminary Improve~ent8 Ccst Estimate <br /> <br />Unit Material Quantities <br />Cost Eatimate hy Reach <br /> <br />CHAPIERI <br /> <br />INTRODUCTION <br /> <br />Pa~e <br /> <br />, <br /> <br />Authorization <br /> <br />, <br />, <br />, <br /> <br />This study of flooding problems oIithin the oorporate boundaries of <br />the City of Crested Buttewaa authorhed under the tettD.S ofa oontr"ot <br />dated November 1, 1976 between Engineering Consultants, Inc., Denver, <br />Colorado, and Colorado Water Conservation Board. <br /> <br />3 <br /> <br />4 <br /> <br />4 <br />4 <br /> <br />Purpose and Soope <br /> <br />, <br /> <br />The purpose of this study is to identify, define and evalu"te the <br />potential flooding problems in the City of Crested Butte oaused by <br />flooding of Coal Creek and to develop solution8 to teduoe or minimize <br />these flooding problems. <br /> <br />u <br /> <br />D <br /> <br />The soope of <br />1. Colleot <br />varioua <br /> <br />the study is to: <br />available basic data relevant to this study from <br />SOUtoes inoluding local, state and federal age.ndes. <br /> <br />u <br />" <br /> <br />,. <br /> <br />Perfo~ hydrclogio analysis to determine tne peak rate <br />of runoff for 10-, 50-, 100-, and SOO-year recurrenoe <br />interval flood for Coal Creek at Crested Butte. <br /> <br />" <br />" <br />" <br />" <br />" <br />" <br />H <br />H <br /> <br />3. <br /> <br />Perform hydraulio oaloulations within tho study roach <br />to determine the water surfaoe profiles for 10-, SO-, <br />100-, and SOO-year reourrence interval flood, and <br />del1neatethelOO-ycarfloodinplan. <br /> <br />4. <br /> <br />Identify existing oonditions causing Coal Creek flood- <br />ing problems. <br /> <br />" <br /> <br />5. <br /> <br />Make recommendations for oorreotive measures to mini- <br />mize the flooding problems. <br /> <br />" <br />U <br /> <br />,. <br /> <br />Present a cost estimate for the recommended oorrective <br />meuures. <br /> <br />7. Present a,..ritten repnn. <br /> <br />, <br />