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Ross Valley Flood Control and Watershed Program

A program to reduce flooding and manage the 1% probability flood through watershed-based solutions and stakeholder involvement.

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Ross Valley Flood Control and Watershed Program

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  1. Ross Valley Flood Control and Watershed Program Marin County Flood Control and Water Conservation District ~ Flood Control Zone 9 ~ Marin County Department of Public Works

  2. Historical Annual Peak Discharges Flood Zone 9 Streamflow Gage

  3. Flood Frequency Curve Flood Zone 9 Streamflow Gage

  4. Program Statement • Create and Implement a program to reduce flooding • Guiding Principles: • Reduce flooding • Watershed based • Include stakeholders in planning process • Set a goal of managing the 1% probability (100 yr.) flood • Integrate proactive environmental stewardship with flood control efforts • Leverage local funds with state and federal funding sources

  5. Programmatic Approach • Gives an overview, a structure • Organizes our efforts • Organizes our discussions • Organizes our spending

  6. Major Categories of the Program • Administration & Finance • Operations and Maintenance • Capital Improvement Projects

  7. Capital Improvement Program Planning Design &Construction Environmental Detention Basins Sediment Mgmt. Federal Project Completion – Unit 4 Fish Passage Dredging Public Property Creek Enhancements Erosion Control Private and “Quasi” Private/ Public Property Flood Control Projects Tidal Prism Habitat Restoration Public Outreach Land Use Management Grants: Application & Management Creek Capacity Improvements Private and Public Partnership Projects Bridge Program State Bonds Real Estate: Acquisitions & Easements (Project Related) Culvert Program Federal Grants Floodwall Program Application Process Interior Drainage

  8. Ross Valley Flood Control

  9. Ross Valley Feasibility Study • Draft expected by January 31, 2011 • Master Plan for flood control program • Major Elements: • Detention Basins • Creek Capacity Improvements • Sediment Management • Cost/Benefit Analysis • Recommended Sequencing

  10. Detention Basin

  11. Capital Improvement ProgramStatus • Planning: • Detention Basins Program: • RV School District and Town of San Anselmo • MMWD - feasibility of using Phoenix Lake for DB. • Parks and Open Space District • Next Steps

  12. Hydraulic Capacity Increase

  13. Capital Improvement Program Status • Creek Capacity Improvements Program • Critical reaches in Fairfax, San Anselmo, Sleepy Hollow • Case studies to TWG • Bridge and Culverts Program • Public Outreach • New Ross Valley Website online now (www.marinwatersheds.org) • TWG Meetings (Series) – next up: Thurs. November 18th • Outreach Program • Private/Public Partnership Projects • Lagunitas Road Bridge (complete) with Town of Ross • Bon Air Bridge with City of Larkspur • Kentfield Drainage Culverts Replacement with RV Sanitary District; • Stage gauges in San Anselmo and Fairfax w/ RV Fire and Towns

  14. Capital Improvement ProgramStatus • Sediment Management & Erosion Control • Third major part of Feasibility Study – December 2010 • Sustainable dredging volume – financial and environmental benefits and implications • Bon Air Bridge Replacement - clear span for a barge • Coordination with other Agencies: • USGS gauges in Ross and Greenbrae Bdwk • BCDC research

  15. Capital Improvement ProgramStatus • Design & Construction • Federal Project Completion – Unit 4 • Administrative Draft of EIR/EIS Baseline Report • EIR/EIS draft coming in Nov./Dec. 2010 • Coordinating computer modeling with ACOE design team • Environmental Projects • Coordinating with Friends of Corte Madera Creek on Saunders Ave. project • Grants Application & Management • Applying for current Prop 1E grant for Phoenix Lake project

  16. Flood Zone 9 ProgramQuestions? Ross Valley Flood Program

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