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PREFACr. This Flood Plain Information Report presents the results of a study of the Roarin,:! Fork River and Colorado River f'lood Plains in the vicinity of Glenwood Springs, Colorado. The report was prepared by Ginyery Associates, Inc., Consulting Engineers of Glenwood Springs, Colorado, at the request of the City of Glenwood Spri~gs and in cooperation with the Colorado Water Conservation Bo~rd. Funding was provided in part by the Garfield County Board of County Commissioners. Copies of this report are available for public distEibution, for a nominal fcc, and nay be acquired from the City or the Colorado Water Conservation Ooard. Technical addendums to the report, covering the hydrologic and hydraulic studies are available for review at the offices of the Colorado Water Conservation Board. These addenda have not been published in sufficient quantity for public distribution. Copies of the report are available at the following locations, City of Glenwood Springs 806 Cooper Avenue Glenwood Springs, CO 81601 Colorado Water Conservation Board 823 State Centennial Building 1313 Sherman Street Denver, CO 80203 -1- I I I I I I I I I I I I I I I I I I TAflLE OF CONTENTS PREFACE INTRODUCTION Authori'lation Purpose and Scope Acknowledgements Related Plood Studies STUDY AREA DESCRIPTION Drainage Rasin Charactcristic~ Study Reach Description f1ISTORY OF f'LOODING IlYDRDLOGIC AND IlYDRAULIC DETERMINATIONS FlOOd Characteristics llydrologic Analyses llydraulic Analyses INTERPRETATION AND USE OF REPORT DATA Flood Frequency and DiScharge Flooded Areas Flood Elevations GLOSSARY BIBLIOGRAPHY TABLES '.I'!!.~ Titl... 1 2 3 D....;nag~ Arca~ Uistorical Flood Peak lHschargcs Flood Frequcncy-Elevatioll and Dis- charge Data PLATES Plate Title Basin M<lp Index Ilap Flooded Areas Flood Profiles Cross Sections . . Par;e 1 3 3 4 , , 7 7 9 11 13 13 13 13 15 15 16 16 23 27 Pol'!" 7 16 17 Number 1 2 )-10 11-19 20-21 I