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

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

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

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

8. Ross Valley Flood Control

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

10. Detention Basin

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

12. Hydraulic Capacity Increase

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

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

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

16. Flood Zone 9 Program Questions? Ross Valley Flood Program