Watershed Restoration and Enhancement Plan WRIA 12 – Chambers-Clover Watershed Final DRAFT January 2021 Publication Information This document is available on the Department of Ecology’s website at: https://fortress.wa.gov/ecy/publications/summarypages/XXXXXX.html Cover photo credit Renee Buck, Chambers-Clover Watershed Council Contact Information Water Resources Program Southwest Regional Office Regional Office P.O. Box 47600 Olympia, WA 98504-7600 Phone: 360-407-XXXX Website:1 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. 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Visit Ecology's website for more information. 1 www.ecology.wa.gov/contact WRIA 12 – Chambers-Clover Watershed Final Draft Plan Page | ii January 2021 Table of Contents List of Figures and Tables ....................................................................................................................................... v Figures ....................................................................................................................................................................... v Tables ........................................................................................................................................................................ v Acknowledgements .............................................................................................................................................. vi Executive Summary ............................................................................................................................................ viii Chapter One: Plan Overview .................................................................................................................................. 1 1.1 WRIA 12 Plan Purpose and Structure .............................................................................................................. 1 1.2 Requirements of the Watershed Restoration and Enhancement Plan ........................................................... 3 1.3 Overview of the WRIA 12 Committee ............................................................................................................. 5 1.4 Committee Structure and Decision Making .................................................................................................... 6 Chapter Two: Watershed Overview ....................................................................................................................... 8 2.1 Brief Introduction to WRIA 12 ......................................................................................................................... 8 2.2 Watershed Planning in WRIA 12 ................................................................................................................... 12 2.3 Description of the Watershed – Geology, Hydrogeology, Hydrology, Streamflow, and Salmon Presence .. 14 Chapter Three: Subbasin Delineation................................................................................................................... 21 3.1 Introduction................................................................................................................................................... 21 3.2 Approach to Develop Subbasins .................................................................................................................... 21 3.3 Subbasin Map ................................................................................................................................................ 21 Chapter Four: New Consumptive Water Use Impacts .......................................................................................... 24 4.1 Introduction to Consumptive Use ................................................................................................................. 24 4.2 Projection of PE Well Connections (2018–2038) ........................................................................................... 24 4.3 Impacts of New Consumptive Water Use ..................................................................................................... 28 Chapter Five: Projects and Actions ....................................................................................................................... 34 5.1 Description and Assessment ......................................................................................................................... 34 5.2 Projects .......................................................................................................................................................... 35 5.3 Project Implementation Summary ................................................................................................................ 44 Chapter Six: Additional Plan Recommendations .................................................................................................. 47 6.1 Plan Implementation and Adaptive Management Recommendations ......................................................... 47 6.2 Policy and Regulatory Recommendations ..................................................................................................... 53 6.3 Rulemaking and Legislative Requests............................................................................................................ 55 Chapter Seven: Net Ecological Benefit ................................................................................................................. 57 WRIA 12 – Chambers-Clover Watershed Final Draft Plan Page | iii January 2021 7.1 Water Offsets .................................................................................................................................................... 57 7.2 Habitat Benefits ................................................................................................................................................ 60 Appendix A – References ....................................................................................................................................A-1 Appendix B – Glossary ........................................................................................................................................ B-1 Appendix C – Committee Roster ......................................................................................................................... C-1 Appendix D – Aquifer Units in WRIA 12 ............................................................................................................. D-1 Appendix E – WRIA 12 Hydrographs ................................................................................................................... E-1 Appendix F – 303d Listed Streams in WRIA 12 .................................................................................................... F-1 Appendix G – WRIA 12 Subbasin Delineation Memo ......................................................................................... G-1 Appendix H – WRIA 12 Permit-Exempt Growth and Consumptive Use Summary ............................................... H-1 Appendix I – Projects ........................................................................................................................................... I-1 Appendix J – Water Rights Report ....................................................................................................................... J-1 Appendix K – Policy and Regulatory Actions Considered by the Committee ....................................................... K-1 Appendix L – Proposed Improvements to Department of Ecology’s Well Reporting Processes ........................... L-1 WRIA 12 – Chambers-Clover Watershed Final Draft Plan Page | iv January 2021 List of Figures and Tables Figures Figure 1 Summary Map ................................................................................................................... ix Figure 2 WRIA 12 Watershed Overview ....................................................................................... 10 Figure 3 WRIA 12 Subbasin Delineation ....................................................................................... 23 Figure 4 WRIA 12 Distribution of Projected PE Wells ................................................................... 27 Figure 5 WRIA 12 Estimated Consumptive Use by Subbasin for 2018-2038 ................................ 33 Figure 6 Proposed Projects ........................................................................................................... 43 Tables Table 1: WRIA 12 Membership ......................................................................................................