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<br />I <br />II <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 />ROCK RIVER AT <br />ROCK RAPIDS, IOVA <br /> <br />SECTION 205 RECONNAISSANCE STUDY <br />PROBLEM IDENTIFICATION REPORT <br /> <br />TABLE OF CONTENTS <br /> <br />lln Palle No. <br /> <br />INTRODUCTION 1 <br />STUDY AUTHORITY 1 <br />REPORT AND STUDY PROCESS 1 <br />STUDY PURPOSE AND OBJECTIVES 3 <br />SCOPE OF STUDY 4 <br />PRIOR STUDIES 4 <br /> <br />PROBLEM IDENTIFICATION 5 <br />BASIN DESCRIPTION 5 <br />STUDY AREA DESCRIPTION 11 <br />EXISTING IMPROVEMENTS 12 <br />FLOOD HISTORY 12 <br />DESCRIPTION OF EXISTING FLOOD PROBLEMS 15 <br />EXPECTED FUTURE VITHOUT-PROJECT CONDITIONS 15 <br />HYDROLOGIC ANALYSIS 15 <br />HYDRAULIC ANALYSIS 20 <br />FLOOD DAMAGE ANALYSIS 21 <br /> <br />LIST OF TABLES <br /> <br />~ Title Pa2e No. <br /> <br />1 COMPARISON OF PEAK DISCHARGES USING VARIOUS METHODS 17 <br />2 EXISTING CONDITIONS PEAK DISCHARGES USED IN 18 <br />HYDRAULIC MODEL <br />3 EXISTING CONDITIONS VATER SURFACE ELEVATIONS 21 <br />4 BUILDING, CONTENT, AND APPURTENANCE DAMAGES 24 <br />VITHIN THE SOO-YEAR FLOOD PLAIN <br />5 NUMBER OF STRUCTURES AFFECTED BY FLOOD EVENT 25 <br />6 EXISTING CONDITIONS ESTIMATED ACTUAL DAMAGE-FREQUENCY 26 <br />RELATIONSHIP <br /> <br />LIST OF FIGURES <br /> <br />No. Title Pa2e No. <br /> <br />1 ROCK RAPIDS VICINITY MAP 2 <br />2 EXISTING CONDITIONS DISCHARGE-FREQUENCY CURVES 19 <br />3 EXISTING CONDITIONS FLOOD PROFILES 22 <br />4 DESCRIPTION OF SUBAREAS 23 <br />