Wria 15 Watershed Plan – Final Draft

Watershed Restoration and Enhancement Draft Plan WRIA 15 Kitsap Watershed February 1, 2021 FINAL DRAFT PLAN FOR LOCAL REVIEW WRIA 15 WATERSHED PLAN – FINAL DRAFT Publication Information This document is available on the Department of Ecology’s website at: https://ecology.wa.gov/Water-Shorelines/Water-supply/Streamflow-restoration/Streamflow- restoration-planning Cover photo credit Curley Creek Courtesy of Kenna Cox Contact Information Water Resources Program Address: 3190 160th Ave SE, Bellevue, WA 98008 Phone: 425-649-7000 Website1: Washington State Department of Ecology ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. To request an ADA accommodation, contact Ecology by phone at 360-407-6872 or email at [email protected]. For Washington Relay Service or TTY call 711 or 877-833-6341. Language Access The Department of Ecology offers free language services about our programs and services for people whose primary language is not English. We can provide information written in your preferred language and qualified interpreters over the telephone. To request these services, or to learn more about what we can provide, contact our Language Access Coordinators by phone at 360-407-6177 or email at [email protected]. When you call, please allow a few moments for us to contact an interpreter. Visit Ecology's website for more information. 1 www.ecology.wa.gov/contact WRIA 15 – FINAL DRAFT PLAN Page ii February 2021 WRIA 15 WATERSHED PLAN – FINAL DRAFT Table of Contents Acknowledgements ............................................................................................................................................ viii Executive Summary .............................................................................................................................................. xi Chapter 1 – Plan Overview ..................................................................................................................................... 1 1.1 WRIA 15 Watershed Plan Purpose and Structure ............................................................................................... 1 1.2 Requirements of the WRIA 15 Watershed Restoration and Enhancement Plan ................................................ 4 1.3 Overview of the WRIA 15 Committee ................................................................................................................. 5 Chapter Two: Watershed Overview ..................................................................................................................... 10 2.1 Brief Introduction to WRIA 15 .......................................................................................................................... 10 2.2 Watershed Planning in WRIA 15 ....................................................................................................................... 19 2.3 Description of the Watershed – Geology, Hydrogeology, Hydrology, and Streamflow ................................... 21 Chapter Three: Subbasin Delineation................................................................................................................... 28 3.1 Introduction ...................................................................................................................................................... 28 3.2 Approach to Develop Subbasins ....................................................................................................................... 28 3.3 WRIA 15 Subbasins ........................................................................................................................................... 29 Chapter Four: New Consumptive Water Use Impacts .......................................................................................... 32 4.1 Introduction to Consumptive Use ..................................................................................................................... 32 4.2 Projection of Permit-Exempt Well Connections (2018–2038) .......................................................................... 32 4.3 Impacts of New Consumptive Water Use ......................................................................................................... 38 Chapter Five: WRIA 15 Projects............................................................................................................................ 54 5.1 Description and assessment ............................................................................................................................. 54 5.2 Category I Projects ............................................................................................................................................ 56 5.3 Category II-IV Projects....................................................................................................................................... 78 5.3 Project Implementation Summary .................................................................................................................... 82 Chapter 6. Additional Plan Recommendations ..................................................................................................... 84 6.1 Policy and Regulatory Recommendations ........................................................................................................ 84 6.2 Adaptive Management Recommendations ...................................................................................................... 89 6.3 Assurance of Plan implementation ................................................................................................................... 98 Chapter Seven: Net Ecological Benefit Evaluation .............................................................................................. 101 7.1 Water Offsets .................................................................................................................................................. 101 7.2 Benefits from Category II-IV Projects .............................................................................................................. 104 WRIA 15 – FINAL DRAFT PLAN Page iii February 2021 WRIA 15 WATERSHED PLAN – FINAL DRAFT 7.3 Adaptive Management ................................................................................................................................... 107 7.4 NEB Evaluation Findings .................................................................................................................................. 107 References ......................................................................................................................................................... 109 Glossary ............................................................................................................................................................. 116 Appendices ........................................................................................................................................................ 125 Appendix A – Committee Roster........................................................................................................................... 126 Appendix B – Operating Principles........................................................................................................................ 127 Appendix C – Aquifer Units within WRIA 15 ......................................................................................................... 137 Appendix D – Surface Water Quality Assessments Category 4 and 5 Listings in WRIA 15 ................................... 138 Appendix E – TMDL Table for WRIA 15 ................................................................................................................. 146 Appendix F – Subbasin Delineation Memo ........................................................................................................... 148 Appendix G – Growth Projections and Consumptive Use Memo ......................................................................... 153 Appendix H – Project Inventory ............................................................................................................................ 170 Appendix I – Detailed Project Descriptions........................................................................................................... 197 Appendix J – Water Rights Assessment Technical Memo ..................................................................................... 299 Appendix K – Proposed Improvements to the Department of Ecology’s Well Reporting Processes ................... 301 WRIA 15 – FINAL DRAFT PLAN Page iv February 2021 WRIA 15 WATERSHED PLAN – FINAL DRAFT List of Figures and Tables Figures Figure 1: Water Resource Inventory Area 15 Overview ________________________________________________ 11 Figure 2. Chico Creek Flow Exceedance. ____________________________________________________________ 25 Figure 3: WRIA 15 Subbasin Delineation for the Watershed Restoration and Enhancement Plan. ______________ 30 Figure 4. WRIA 15 Projected New Permit-Exempt Wells (number and likely area) Under the Moderate Estimate Growth Scenario 2018-2038. ____________________________________________________________________ 37 Figure 5. WRIA 15 Estimated Consumptive Use based on Moderate Estimate for Growth

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