Ross Valley Flood ControlRoss Valley Flood Control and and

Watershed ProgramWatershed Program

Marin County Flood Control and Water Marin County Flood Control and Water Conservation DistrictConservation District

~~Flood Control Zone 9Flood Control Zone 9

~~ Marin County Department of Public WorksMarin County Department of Public Works

Historical Annual Peak Discharges Historical Annual Peak Discharges Flood Zone 9 Streamflow GageFlood Zone 9 Streamflow Gage

Flood Frequency Curve Flood Frequency Curve Flood Zone 9 Streamflow GageFlood Zone 9 Streamflow Gage

Program StatementProgram Statement

Create and Implement a program to reduce Create and Implement a program to reduce flooding flooding

Guiding Principles:Guiding Principles: Reduce flooding Reduce flooding Watershed basedWatershed based Include stakeholders in planning processInclude stakeholders in planning process Set a goal of managing the 1% probability (100 Set a goal of managing the 1% probability (100

yr.) floodyr.) flood Integrate proactive environmental stewardship Integrate proactive environmental stewardship

with flood control effortswith flood control efforts Leverage local funds with state and federal Leverage local funds with state and federal

funding sourcesfunding sources

Programmatic ApproachProgrammatic Approach

Gives an overview, a structureGives an overview, a structure Organizes our effortsOrganizes our efforts Organizes our discussionsOrganizes our discussions Organizes our spendingOrganizes our spending

Major Categories of the Major Categories of the ProgramProgram

Administration & FinanceAdministration & FinanceOperations and Operations and MaintenanceMaintenance

Capital Improvement Capital Improvement ProjectsProjects

Capital Improvement Capital Improvement ProgramProgram

Planning

Public Outreach

Creek CapacityImprovements

Detention Basins

Private and PublicPartnership

Projects

Sediment Mgmt.Federal ProjectCompletion –

Unit 4

Environmental

State Bonds

Grants:Application

&Management

Design &

Construction

Bridge Program

Federal GrantsCulvert Program

Floodwall Program

Dredging

Erosion Control

Tidal Prism

Fish Passage

Creek Enhancements

Habitat Restoration

Land UseManagement

ApplicationProcess

Public Property

Private and “Quasi” Private/

PublicProperty

Real Estate:Acquisitions

&Easements

(Project Related)Interior Drainage

Flood ControlProjects

Ross Valley Flood Control

Ross Valley Feasibility Ross Valley Feasibility StudyStudy

Draft expected by January 31, 2011Draft expected by January 31, 2011 Master Plan for flood control programMaster Plan for flood control program Major Elements:Major Elements:

Detention BasinsDetention Basins Creek Capacity ImprovementsCreek Capacity Improvements Sediment ManagementSediment Management Cost/Benefit AnalysisCost/Benefit Analysis Recommended SequencingRecommended Sequencing

Detention BasinDetention Basin

Capital Improvement Capital Improvement ProgramProgramStatusStatus Planning:Planning:

Detention Basins ProgramDetention Basins Program:: RV School District and Town of San AnselmoRV School District and Town of San Anselmo MMWD - feasibility of using Phoenix Lake for MMWD - feasibility of using Phoenix Lake for

DB. DB. Parks and Open Space District Parks and Open Space District Next StepsNext Steps

Hydraulic Capacity IncreaseHydraulic Capacity Increase

Creek Capacity Improvements ProgramCreek Capacity Improvements Program Critical reaches in Fairfax, San Anselmo, Sleepy HollowCritical reaches in Fairfax, San Anselmo, Sleepy Hollow Case studies to TWG Case studies to TWG Bridge and Culverts ProgramBridge and Culverts Program

Public OutreachPublic Outreach New Ross Valley Website online now New Ross Valley Website online now

(www.marinwatersheds.org)(www.marinwatersheds.org) TWG Meetings (Series) – next up: Thurs. November 18thTWG Meetings (Series) – next up: Thurs. November 18th Outreach ProgramOutreach Program

Private/Public Partnership ProjectsPrivate/Public Partnership Projects Lagunitas Road Bridge (complete) with Town of RossLagunitas Road Bridge (complete) with Town of Ross Bon Air Bridge with City of LarkspurBon Air Bridge with City of Larkspur Kentfield Drainage Culverts Replacement with RV Sanitary Kentfield Drainage Culverts Replacement with RV Sanitary

District; District; Stage gauges in San Anselmo and Fairfax w/ RV Fire and Stage gauges in San Anselmo and Fairfax w/ RV Fire and

TownsTowns

Capital Improvement Capital Improvement Program Program

StatusStatus

Sediment Management & Erosion Sediment Management & Erosion ControlControl Third major part of Feasibility Study – Third major part of Feasibility Study –

December 2010December 2010 Sustainable dredging volume – financial and Sustainable dredging volume – financial and

environmental benefits and implicationsenvironmental benefits and implications Bon Air Bridge Replacement - clear span for Bon Air Bridge Replacement - clear span for

a barge 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 researchBCDC research

Capital Improvement Capital Improvement ProgramProgramStatusStatus

Design & ConstructionDesign & Construction Federal Project Completion – Unit 4Federal Project Completion – Unit 4

Administrative Draft of EIR/EIS Baseline ReportAdministrative Draft of EIR/EIS Baseline Report EIR/EIS draft coming in Nov./Dec. 2010EIR/EIS draft coming in Nov./Dec. 2010 Coordinating computer modeling with ACOE design Coordinating computer modeling with ACOE design

teamteam

Environmental ProjectsEnvironmental Projects Coordinating with Friends of Corte Madera Creek on Coordinating with Friends of Corte Madera Creek on

Saunders Ave. projectSaunders Ave. project Grants Application & ManagementGrants Application & Management

Applying for current Prop 1E grant for Phoenix Applying for current Prop 1E grant for Phoenix Lake project Lake project

Capital Improvement Capital Improvement ProgramProgramStatusStatus

Flood Zone 9 ProgramFlood Zone 9 ProgramQuestions?Questions?

Ross Valley Flood Program