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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 />DIRECT FLOW AREA 0054 <br />MAJOR DRAINAGEWAY PLANNING - PHASE "B" <br /> <br />TABLE OF CONTENTS <br /> <br />LETTER OF SUBMITTAL <br />LIST OF TABLES <br />LIST OF FIG URES <br /> <br />I. MAJOR DRAINAG EW AY PLANNING - DIRECT FLOW AREA 0054 <br />Introduction <br />Existing Flood Hazards <br />Summary of the Phase "B" Plan <br /> <br />II. STUDY AREA DESCRIPTION <br />Drainage Basin Characteristics <br />Study Reach Description <br /> <br />III. SUMMARY OF THE HYDROLOGIC ANALYSIS <br />Derivation of Hydrographs <br />Rainfall Data <br />Land Use <br />Losses <br />Flood Routing <br />Flood Hydrographs <br /> <br />IV. SUMMARY OF THE PHASE "A" ANALYSIS <br />Flood Plains and Flood Damage <br />Alternatives <br />Benefit/Cost Analysis <br />Selection of the Recommended Plan <br /> <br />V. DESIGN CONSIDERATIONS AND CRITERIA <br />Channel Design <br />Structures <br />Right-of-Way <br />Operation and Maintenance Requirements <br />Water Quality <br />Parks and Recreation <br />Administra tion <br />Implementation <br />Cost Estimate <br /> <br />VI. APPENDIX <br />Appendix A - Phase "B" Directive Memorandum <br />Appendix B - Legal Review <br />Appendix C - Agency/Interested Party Contacts <br /> <br />VII. DRAWINGS <br /> <br />Major Drainageway Planning Sheets 1 through 11 <br /> <br />LIST OF TABLES <br /> <br />Page <br /> <br />Page <br /> <br />I-I Jurisdictional Cost Breakdown Summary <br /> <br />1-4 <br /> <br />III-I Direct Flow Area 0054 <br /> <br />ID-2 <br /> <br />III-2 Temporal Distributions of Rainfall <br /> <br />ID-2 <br /> <br />1-1 <br />I -I <br />I -I <br />1-2 <br /> <br />IV-l Flood Damage by Jurisdiction <br />IV-2 AI ternatives Investigated - Direct Flow Area 0054 <br /> <br />N-2 <br /> <br />N-4 <br /> <br />IT - I <br />II -I <br />II - I <br /> <br />V-I Design Criteria <br /> <br />V-I <br /> <br />V-2 Unit Costs <br /> <br />V-6 <br /> <br />ID-i <br />ID-I <br />ID-I <br />ID-3 <br />ID-3 <br />ID-3 <br />ID-3 <br /> <br />V-3 Annual Operation and Maintenance Costs <br /> <br />V-6 <br /> <br />V-4 Cost Breakdown Summary - By Reach <br /> <br />V-7 <br /> <br />LIST OF FD URES <br /> <br />I-I Selected Plan <br /> <br />W-I <br />N-I <br />N-2 <br />N-3 <br />N-3 <br /> <br />III-I Rainfall Hyetograph - 100 Year Storm <br /> <br />1II-2 100 Year Flood Hydrograph - Confluence with South Platte <br />River and at Riverdale Road <br /> <br />V-I <br />V-I <br />V-I <br />V-2 <br />V-2 <br />V-3 <br />V-3 <br />V-4 <br />V-4 <br />V-5 <br /> <br />III-3 100 Year Flood Hydrograph - Holly Street <br /> <br />IlI-4 100 Year Flood Hydrograph - East 112th Avenue <br /> <br /> <br />IlI-5 Peak Flood Discharges - Direct Flow Area 0054 <br /> <br /> <br />IIl-6 Peak Flood Discharges - Direct Flow Area 0054 Middle and <br /> <br />Northern Branches <br /> <br />IV-l Alternative Matrix <br /> <br />NOTE: <br /> <br />All figures appear at the end of the respective sections. <br />