Regional Needs Assessment Report
The purpose of this Regional Needs Assessment (RNA) is to identify conveyance system improvement (CSI) projects and costs in order to provide a baseline for conducting benefit/cost analyses of potential Infiltration and Inflow (I/I) reduction projects. Flow monitoring and modeling data and assumptions specifically developed for the I/I Control Program were used to project CSI project needs to allow for an accurate comparison of benefits and costs between CSI projects and I/I reduction projects. As a result, the complete list of CSI projects reported here differs from what is included in the Regional Wastewater Services Plan (RWSP), as updated in 2004. The major difference is that CSI projects identified in this RNA are projected through 2050 rather than 2030 - the planning horizon for the RWSP. Additionally, the more recent and comprehensive flow metering and modeling data used differs from that used during the update of the RWSP. This resulted in some modification of CSI projects expected to be needed by 2030. While some differences exist between the CSI projects identified in this RNA and those in the RWSP, this latest list of needs should not be viewed as a departure from recommendations contained in the RWSP. Rather it should be viewed as providing a baseline for conducting benefit/cost analyses of potential I/I reduction projects using assumptions and data developed specifically for the I/I Control Program. For more information, please contact Erica Jacobs at (206) 684-1138 or Erica.Jacobs@kingcounty.gov. Table of Contents You will need a PDF Reader to view these documents. Report and appendices, issued March 2005 (2.2 MB)
Title Page, Acknowledgements
Contents
Acronyms and Abbreviations
Chapter 1. Executive Summary
Chapter 2. Background (353 KB)
Chapter 3. Condition of the Regional Wastewater Conveyance System (667 KB)
Chapter 4. Conveyance Needs (526 KB)
List of Appendices
Appendix A1 – Model Selection Process
Appendix A2 – Application of the Extended Time Series Precipitation and Evaporation
Appendix A3 – Model Basin Delineation Summary
Appendix A4 – Model Calibration
Appendix A5 – Assumptions for Regional I/I Control Program
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