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I I I I I I I I I I I I I I I I I I I Section II III IV V VI TABLE OF CONTENTS Title LETTER OF TRANSMITTAL EXECUTIVE SUMMARY The Study Area Major Drainageway Plan Improvements EXISTING BASIN DESCRIPTION Subbasin 1 (Headwaters to Addenbrooke Pond) Subbasin 2 (Addenbrooke Pond to Rockmont Ponds) Subbasin 3 (Rockmont Ponds to pond near First Avenue and Balsam Street) Subbasin 4 (Pond near First Avenue and Balsam Street to Wadsworth Blvd.) Subbasin 5 (Wadsworth Blvd. to confluence with Lakewood Gulch) HYDROLOGICAL SUMMARY General Comments Soils, Geology and Infiltration South Lakewood Gulch Hydrology APPENDIX TO SECTION III Rainfall FLOODPLAINS Gene ra I Flood Frequency Flood Magn i tude Flood Profiles Principles of Floodplain Controls Flood Damages BASIS OF DESIGN General Planning Strategy PHASE A ALTERNATIVES General Comments Page Section VII VIII 1-1 1-1 IX 11-1 11-1 11-2 11-2 11- 3 1-1 11-1 111-1 111-2 111-3 111-1 111-2 III-A 111-3 111-4 ' III-A IV-l IV-l IV-l IV-] IV-2 IV-3 V-I V-2 VI-l VI-2 V-5 VII-l VII-2 VI-l VII-3 TABLE OF CONTENTS Title Page PHASE A BENEFIT/COST ANALYSIS Genera I V 11-1 PHASE B MAJOR DRAINAGEWAY PLANNING BI BLI OG RAP HY APPENDIX A AGENCY/INTERESTED PARTY CONTACT APPENDIX B LEGAL OPINION LI ST OF TABLES Summary of Total Costs Phase B 1-3 Subbasin Characteristics 11-4 Peak Runoff Flows Present Conditions 111-3 Peak Runoff Flows Future Development 111-5 111-5 111-6 IOO-Year Peak Runoff Flows Future Development Runoff Volumes Future Development Incremental Rainfall Data III-^ Unit Prices V-3 v-4 Drainage and Flood Control System Operation and Maintenance Costs Storage Alternatives Investigated Phase A VI-3 Non-Storage Alternatives Investigated Phase A VI-4 Phase A Unit Prices VII-3 VII-4 Phase A Annual Unit Costs for 0 & M Benefit/Cost Comparison Storage/Channel Improvements VII-5