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I I I I I I I I I I I I I I I t I I I TABLE OF CONTENTS PREFACE INTRODUCTION Authorization Purpose and Scope Acknowledgments Mapping and Surveys STUDY AREA DESCRIPTION Drainage Basin Characteristics Flooding Potential Drainage Structure Inventory SPECIAL STUDIES Flood Hydrology Hydraulics, Flood Plain and Floodway Delineation Damage-Benefit Potential Legal Evaluation Soils Investigation INTERIM PLANNING Proposed Drainageway Improvement Alternatives Interim Planning and Decision Making FINAL PLANNING CRITERIA Drainageway Design Criteria Channels Culverts and Bridges Operations and Maintenance Considerations Irrigation Ditch Crossings Flood Storage Reservoirs DRAINAGEWAY IMPROVEMENTS COSTS PLAN IMPLEMENTATION SUMMARY BIBLIOGRAPHY APPENDIX DRAWINGS Page 1 1 1 1 2 2 3 3 4 4 5 5 6 7 8 9 9 10 13 14 14 14 14 15 16 16 16 22 24 25 26 Figure 5 Table I Table II Table III Table IV Table V Table VI Table VII Table VIII Table IX Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 LIST OF TABLES Page Structure Inventory Design Rainfall and Abstractions Flood Frequency and Discharge Unit Prices Used for Estimated Construction Costs Cost Breakdown Plan Implementation Priority Recommendations Van Bibber Creek, Land Use Data Basin Paramenters Flood Plain and Floodway Reference Data 5 6 6 23 23 24 A-4 A-5 A-6 LIST OF FIGURES (All Figures Located in the Appendix) 10-year, lOa-year flood hydrographs, Van Bibber Creek at Mouth. 10-year, lOa-year flood hydrographs, North Tributary at Mouth. 10-year, 100-year flood hydrographs, South Tributary at Mouth. la-year, 100-year flood hydrographs, Van Bibber Creek, Upstream Limit of Study. Discharge Probability Curves, Projected - Developmen~Van Bibber Creek. Discharge Probability Curves, Projected - Development, South Tributary. A-I A-I A-2 A- 2 A- 3 A- 4