Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

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Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment APPENDIX D INVESTIGATIONS AND ANALYSES REPORT POWERLINE FLOOD RETARDING STRUCTURE SUPPLEMENTAL WATERSHED PLAN AND ENVIRONMENTAL ASSESSMENT DRAFT Prepared by: Kimley-Horn and Associates, Inc. For the: Flood Control District of Maricopa County FCD2008C042 In cooperation with: Natural Resources Conservation Service US Department of Agriculture USDA- NRCS January 2013 Kimley-Horn and Associates, Inc.
Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment TABLE OF CONTENTS 1. INTRODUCTION ...............................................................................................................1 2. HYDROLOGY AND HYDRAULICS ................................................................................2 2.1. Previous Studies ....................................................................................................................... 2 2.2. Hydrologic Design Criteria ....................................................................................................... 2 2.3. Probable Maximum Precipitation/Probable Maximum Flood .................................................... 3 2.4. Existing and Future Conditions Hydrology and Hydraulics Update ........................................... 3 2.5. Level Pool Analysis Results ..................................................................................................... 3 2.6. Dynamic Reservoir Routing Results ......................................................................................... 4 2.7. Principal Spillway Hydrograph, Stability Design Hydrograph and Freeboard Hydrograph ........ 5 2.8. Downstream Inundation Analysis ............................................................................................. 6 2.9. Sediment Yield Analysis Update .............................................................................................. 6 2.10. Freeboard ................................................................................................................................. 7 2.11. Level II Hydrology and Hydraulics Technical Memorandum .................................................... 7 2.12. Final Level III Alternatives Summary Report............................................................................ 7 3. ECONOMICS......................................................................................................................9 3.1. Economics Evaluation Technical Memorandum Summary ........................................................ 9 3.1.1. Study Area Inventory ..................................................................................................... 9 3.2. Hydrologic Model .....................................................................Error! Bookmark not defined. 3.3. Hydraulic Model .................................................................................................................... 11 3.4. Benefits: Preferred Alternative and No Federal Action Alternative ......................................... 11 3.5. Costs: Preferred Alternative and No Federal Action Alternative .............................................. 12 3.5.1. Benefit-Cost Ratio ........................................................................................................ 12 3.5.2. Risks and Uncertainty ................................................................................................... 13 4. GEOTECHNICAL ............................................................................................................ 14 4.1. Final Geotechnical Summary and Analysis Report .................................................................. 14 4.1.1. Scope of Work ................................................................Error! Bookmark not defined. 4.1.2. Previous Investigations ................................................................................................. 14 4.1.3. Planning Geotechnical Investigation ............................................................................. 14 4.1.4. Regional Geologic Setting ............................................................................................ 15 4.1.5. Local Geomorphic Setting ............................................................................................ 15 4.1.6. Local Geologic Setting ................................................................................................. 15 4.1.7. Soil Profiles at Structures ................................................Error! Bookmark not defined. USDA- NRCS January 2013 Kimley-Horn and Associates, Inc. Page i
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DRAFT SUPPLEMENTAL WATERSHED PLAN A
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