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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />TABLE OF CONTENTS <br /> <br />LIST OF FIGURES <br /> <br />Page <br /> <br />Page <br /> <br />Figure 1: Study Area Map 5 <br /> <br />LIST OF FIGURES i <br /> <br />LIST OF TABLES <br /> <br />LIST OF TABLES i <br /> <br />PREFACE ii <br /> <br />Table 1: Historical Flood Peak Discharges and Stages, <br />St. Vrain at Lyons 6 <br /> <br />SECTION 1 - INTRODUCTION 1 <br />1.1 Authorization 1 <br />1.2 Purpose and Scope 1 <br />1.3 Acknowledgements 1 <br />1.4 Related Flood Studies 2 <br /> <br />Table 2: Peak Discharges at Selected Locations 15 <br /> <br />Table 3: USGS Gaging Stations 16 <br /> <br />Table 4: Roughness Coefficients 17 <br /> <br />SECTION 2 - STUDY AREA DESCRIPTION 3 <br />2.1 Drainage Basin Characteristics 3 <br />2.2 Climate 3 <br />2.3 Study Reach Description 3 <br /> <br />Table 5: Flood Frequency-Elevation and <br />Discharge Data 19 - 25 <br /> <br />Table 6: North St. Vrain - St. Vrain Creek <br /> <br />Benchmark Information 26 <br /> <br />SECTION 3 - HISTORY OF FLOODING 6 <br /> <br />SECTION 4 - HYDROLOGIC AND HYDRAULIC DETERMINATIONS 14 <br />4.1 Flood Characteristics 14 <br />4.2 Hydrologic Analysis 14 <br />4.3 Hydraulic Analysis 14 <br /> <br />SECTION 5 - INTERPRETATION AND USE OF REPORT DATA 17 <br />5.1 Flooding Frequency and Discharge Table 17 <br />5.2 10- and 50-Year Flood Events 17 <br />5.3 100-Year Flood Event 17 <br />5.4 SOD-Year Flood Event 18 <br />5.5 Flooded Areas 18 <br />5.6 Flood Elevations 18 <br />5.7 Horizontal and Vertical Control Monumentation 18 <br /> <br />BIBLIOGRAPHY 27 <br /> <br />GLOSSARY 28 <br /> <br />-i- <br />