Percival Creek Comprehensive Drainage Basin Plan, May 1993

Note: The basin plan on this Web page has been divided into several PDFs to make it easier for viewers to find information.  

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Section 1 (PDF)

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

Section 2 (PDF)

• Chapter 4 Basin Characterization
• Chapter 5 Percival Creek Characteristics

Section 3 (PDF)

• Chapter 6 Basin Problem Analysis
• Chapter 7 Management Alternatives

Section 4 (PDF)

• 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 (PDF)

• Chapter 12 Implementation Costs
• Chapter 13 Funding Alternatives

Section 7 Maps from Appendix 1

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

Section 8 Continuation of Maps from Appendix 1

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

Section 9 Continuation of Maps from Appendix 1

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

Section 10 Continuation of 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 Tables from Appendix 2

• 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 (PDF)

• 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 (PDF)

• 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 (PDF)

• 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