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Thurston County Basin Plans

Percival Creek Drainage Basin Plan

Note: The basin plan on this Web page has been divided into several PDFs to make it easier for viewers to find information.  Although the PDFs are generally about 25-35 pages long, they still take time to load because the PDFs were created by scanning a paper-version of the document (as opposed to simply converting a Word document to a PDF).

Instead of waiting to view the files through this web site, a better choice is to right-click the underlined hyperlink and then "save target" (ie., save the file) to your own computer and open it from there. Use the magnifying glass in Adobe to zoom in.

 red arrowAlso see monitoring data

Percival Creek Comprehensive Drainage Basin Plan, May 1993

Percival Creek Basin Plan coverSection 1 (748 KB) includes:

  • Acknowledgements
  • Table of Contents
  • Chapter 1: Introduction
  • Chapter 2: Goals and Objectives
  • Chapter 3: Authority of the Basin Plan

Section 2 (1.8 MB) includes:

  • Chapter 4: Basin Characterization
  • Chapter 5: Percival Creek Characteristics

Section 3 (1.6 KB) includes:

  • Chapter 6: Basin Problem Analysis
  • Chapter 7: Management Alternatives

Section 4 (1.4 KB) includes:

  • Chapter 8: Evaluation of Alternatives
  • Chapter 9: Preferred Alternative and Recommendations

Section 5 (1.5 KB) includes:

  • Chapter 10: Alternative III: Optimal Level of Service
  • Chapter 11: Nonstructural Surface Water Management Program

Section 6 (1.5 KB) includes:

  • Chapter 12: Implementation Costs
  • Chapter 13: Funding Alternatives

Section 7 (510 KB) includes the following maps (from Appendix 1):

  • Map 1: Percival Basin Vicinity Map
  • Map 2: Percival Creek Basin
  • Map 3: Percival Creek Sub-Basins

Section 8 (800 KB) includes the following maps (from Appendix 1):

  • Map 4: Percival Creek Sensitive Areas
  • Map 5: Percival Creek Soils
  • Map 6: Percival Creek Land Use

Section 9 (869 KB) includes the following maps (from Appendix 1):

  • Map 7: Percival Creek Zoning
  • Map 8: Percival Creek Storm System
  • Map 9: Percival Creek Habitat/Flooding Characteristics

Section 10 (714 KB) includes the following maps (from Appendix 1):

  • Map 10: Percival Creek Shoreline Management Areas
  • Map 11: Percival Creek Water Quality Monitoring Sites
  • Map 12: Proposed Capital Improvements, Percival Creek Basin
  • Map 13: Cluster Development Proposals, Percival Creek Basin

Section 11 (746 KB) includes Appendix 2 Tables:

  • Table A-1: Soil, Land Cover and Slope Characteristics
  • Table A-2: Soil Characteristics
  • Table A-3: Current and Potential Future Land Use
  • Table A-4: Instream Culverts
  • Table A-5: Creek Flows with Existing Land Use Conditions
  • Table A-6: Low Creek Flows With Existing Land Use Conditions
  • Table A-7: Potential Effects of Urban Runoff on Stream Systems
  • Table A-8: Salmon Biological and Habitat Requirements
  • Table A-9: Salmon Environmental Parameters
  • Table A-10: Common Water Quality Contaminants
  • Table A-11: Creek Flows with Predeveloped Conditions
  • Table A-12: Creek Flows with Build-Out Land Use Conditions
  • Table A-13: Current and Potential Future Creek Widths at Selected Locations
  • Table A-14: Actual and Recommended Culvert Water Depths and Velocities, Existing Flow Conditions
  • Table A-15: Estimated Private Costs of Drainage System Development
  • Table A-16: Basin Specific Structural Projects and Potential Funding Sources
  • Table A-17: Implications of Stormwater Utility Rate Changes
  • Table A-18: Grand and Loan Programs
  • Table A-19: Potential Revenue Sources

Section 12 (1.5 KB) includes:

  • Appendix 3: Detention/Retention Facilities
  • Appendix 4: Computer Modeling Technical Information
  • Appendix 5: Water Quality Monitoring Results
  • Appendix 6: Open Space/Cluster Development
  • Appendix 7: Public Involvement and Education Documents (see Section 10 as well)

Section 13 (849 KB) includes:

  • Regional PIE Approach
  • Environment 2010 Guidelines for PIE
  • Policies and Guidelines for PIE from the Puget Sound Water Quality Authority
  • Environmental Education Legislation
  • PIE Tasks for Percival Basin Plan
  • Summary of Percival Basin Plan Public Workshop

Section 14 (1.6 MB) includes:

  • Environmental Education Priorities for EPA Region 10
  • Appendix 8: Long-Term Water Quality Monitoring Plan
  • Appendix 9: Water Resources Regulations
  • Appendix 10: Glossary
  • Appendix 11: Determination of Nonsignificance
  • Appendix 12: Letters of Concurrence

Contact Us

 Staff contact: Jeff Killelea (360) 867-2073 E-mail: killelj@co.thurston.wa.us


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