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Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan

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Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan Jefferson County, Washington June 2009 Prepared by: Jefferson County Department of Community Development 621 Sheridan Street Port Townsend, WA 98368 360.379.4450 www.co.jefferson.wa.us and 626 Columbia Street NW Suite 2A Olympia, WA 98501-9000 360.570.4400 This page is intentionally left blank. Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan June 2009 i Table of Contents Section 1 Plan Development............................................................................ 1 1.1 Purpose and Scope ....................................................................................................... 1 1.2 Plan Development Process ........................................................................................... 1 1.3 Advisory Committee Meetings ....................................................................................... 2 1.4 Public Involvement......................................................................................................... 3 1.5 Flood Hazard Management Goals and Objectives........................................................ 3 Section 2 Existing Conditions Analysis ............................................................ 5 2.1 Watershed Description .................................................................................................. 5 2.1.1 CFHMP Planning Area ..................................................................................... 6 2.1.2 Duckabush River .............................................................................................. 6 2.1.3 Dosewallips River ........................................................................................... 11 2.2 Natural Features Assessment ..................................................................................... 12 2.2.1 Duckabush River ............................................................................................ 12 2.2.2 Dosewallips River ........................................................................................... 13 2.3 Land Use Analysis....................................................................................................... 15 2.3.1 Duckabush River ............................................................................................ 16 2.3.2 Dosewallips River ........................................................................................... 19 2.4 Infrastructure Analysis ................................................................................................. 23 2.5 Planning and Regulatory Context................................................................................ 29 2.6 River Reach Descriptions ............................................................................................ 35 2.6.1 Duckabush River ............................................................................................ 36 2.6.2 Dosewallips River ........................................................................................... 41 2.7 History of Flooding and Flood Hazard Analysis........................................................... 45 2.7.1 Duckabush River ............................................................................................ 45 2.7.2 Dosewallips River ........................................................................................... 48 2.7.3 December 2007 Flood .................................................................................... 51 2.7.4 Climate Change .............................................................................................. 53 2.8 Flood Management Activities....................................................................................... 53 2.8.1 Historical Flood Management Activities.......................................................... 53 2.8.2 Current Flood Management Activities............................................................. 54 Section 3 Determination of Need .................................................................. 59 Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan June 2009 ii Section 4 Flood Hazard Management Alternatives........................................ 61 4.1 Identification of Alternatives......................................................................................... 61 4.2 Evaluation of Alternatives ............................................................................................ 61 4.3 Potential Flood Hazard Management Alternatives ...................................................... 62 4.3.1 Structural and Instream Alternatives............................................................... 62 4.3.2 Non-structural Alternatives ............................................................................. 66 Section 5 Conclusions and Proposed Solutions ............................................. 71 5.1 Proposed Flood Hazard Management Solutions......................................................... 71 5.1.1 Ongoing Programs.......................................................................................... 72 Section 6 Implementation and Funding ........................................................ 75 Section 7 Plan Review, Revision, Adoption and Maintenance ....................... 77 7.1 Plan Adoption .............................................................................................................. 77 7.2 Plan Evaluation and Updates ...................................................................................... 77 7.3 Continued Public Involvement ..................................................................................... 77 Section 8 References ..................................................................................... 79 Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan June 2009 iii List of Tables Table 1. Jefferson County CFHMP Advisory Committee.............................................................2 Table 2. Evaluation of Flood Hazard Management Alternatives................................................69 List of Figures Figure 1. Skokomish-Dosewallips Water Resource Inventory Area (WRIA 16)...........................7 Figure 2. CFHMP Planning Area .................................................................................................9 Figure 3. Duckabush River Estuary ...........................................................................................16 Figure 4. Dosewallips River Estuary ..........................................................................................21 Figure 5. Lazy C.........................................................................................................................25 Figure 6. Olympic Canal Tracts .................................................................................................27 Figure 7. Duckabush River Special Flood Hazard Areas...........................................................31 Figure 8. Dosewallips River Special Flood Hazard Areas .........................................................33 Figure 9. Duckabush River Reach Boundaries..........................................................................39 Figure 10. Dosewallips River Reach Boundaries.......................................................................42 Figure 11. Duckabush River Annual Peak Streamflow (1939 – 2006).......................................46 Figure 12. Dosewallips River Annual Peak Streamflow (1931 – 1968) .....................................49 List of Appendices Appendix A – Advisory Committee Meetings Appendix B – Public Involvement Appendix C – Plan Adoption Appendix D – CTED Certification Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan June 2009 iv This page is intentionally left blank. Duckabush and Dosewallips Comprehensive Flood Hazard Management Plan June 2009 v Section 1 Plan Development 1.1 Purpose and Scope This Comprehensive Flood Hazard Management Plan (CFHMP) was developed by Jefferson County and HDR (Jerry Louthain and Rona Spellecacy, project consultants) with input from an Advisory Committee and the citizens of Jefferson County, Washington. The purpose of this CFHMP was to evaluate and reduce flooding risks from the Duckabush and Dosewallips Rivers. The Duckabush and Dosewallips CFHMP was intended to accomplish three key tasks: 1. Designate river reaches on the Duckabush and Dosewallips Rivers for investigation; 2. Conduct hydrologic analysis of the designated river reaches to assess flood risks and identify flood hazard management alternatives; and 3. Conduct long range planning to lay the foundation for future flood management projects and policies. The development of this CFHMP was funded by a grant from the Washington State Department of Ecology (Ecology) through the Flood Control Assistance Account Program (FCAAP) authorized under Chapter 86.26 of the Revised Code of Washington (RCW) and 173-145 of the Washington Administrative Code (WAC). 1.2 Plan Development Process The CFHMP development process included the following steps: • Advisory Committee: An Advisory Committee comprised of Jefferson County staff, County consultants, Tribes, representatives of federal, state, and local resource agencies, other stakeholders, and citizens was formed • Advisory Team and Public meetings: Meetings were held to define the goals and objectives for the CFHMP and ensure the Plan met the needs of the community • Identify and Analyze: Identified the CFHMP
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