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Vulnerability of Major Wastewater Facilities to Flooding from Sea-Level Rise

Vulnerability of Major Wastewater Facilities to Flooding from Sea-Level Rise. August 21, 2008 Shaun O’Neil King County WTD. King County wastewater treatment service area King County boundary. King County. King County. SNOHOMISH. SNOHOMISH. Sewerage. Sewerage. Service Area.

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Vulnerability of Major Wastewater Facilities to Flooding from Sea-Level Rise

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  1. Vulnerability of Major Wastewater Facilities to Flooding from Sea-Level Rise August 21, 2008 Shaun O’Neil King County WTD

  2. King County wastewater treatment service area King County boundary King County King County SNOHOMISH SNOHOMISH Sewerage Sewerage Service Area Service Area Seattle Seattle KING KING King County Wastewater System a a • Serve 1.4 M people • 2.4 M by 2030 • 420 sq.mi. • 42 pump stations • 19 regulator stations • 353 miles of pipe • 2” – 14’ in diameter • 200 mgd average treatment • 34 Local agencies contribute flow New Secondary plant (2010) CSO Treatment plant West Secondary plant CSO Plant Treatment plant Puget Sound South Secondary plant

  3. Scope and Assumptions • Facility Elevations • Current Tide levels • Future Tide Levels • Storm Impacts • Results Cal State LA

  4. University of Washington USGS

  5. NOAA

  6. NOAA

  7. Mean Sea Level Difference:for Seattle, WA 1983-2001 1960-1978 Difference: 14.58 ft. 14.40 ft. 0.18 ft. NOAA

  8. IPCC, 2007

  9. IPCC, 2007

  10. NASA NASA

  11. Feet above NAVD 88 0’ Feet Above NAVD 88 0’ Zervas, C.E., 2007

  12. Zervas, C.E., 2007

  13. Next Steps • Terrain analysis of five lowest sites and West Point Treatment Plant. • Create tool to replicate Vulnerability Analysis for other agencies. • Conduct analysis of impact of sea-level rise on system hydraulics. • Include sea-level rise as a planning factor for future projects. • Review sea-level rise literature every five years and coordinate with CSI Updates.

  14. References • Intergovernmental Panel on Climate Change (IPCC). 2007. Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Solomon, S., Qin, D., Manning, M., Chen, Z.,. Marquis, M., Averyt, K.B., Tignor, M. and Miller, H.L. (Eds.). Cambridge, UK, and New York, NY: Cambridge University Press. • Mote, P., Petersen A., Reeder, S., Shipman, H., and Whitely Binder, L. 2008. Sea Level Rise in the Coastal Waters of Washington State. Report prepared by the Climate Impacts Group, University of Washington, Seattle, Washington, and the Washington Department of Ecology, Lacey, Washington. • Zervas, C.E. 2005. Response of Extreme Storm Tide Levels to Long-Term Sea Level Change. Oceans, 2005, Proceedings of MTS/IEEE, 3, 2501-2506.

  15. Questions?

  16. Websites • King County Climate Change with Vulnerable Facilities Analysis Paper - http://dnr.metrokc.gov/dnrp/climate-change/conference-2005.htm • UW Climate Impacts Group - http://cses.washington.edu/cig/ • Mote Paper - http://cses.washington.edu/db/pdf/moteetalslr579.pdf • Puget Sound LIDAR Consortium - http://pugetsoundlidar.ess.washington.edu/About_PSLC.htm • NOAA Tides and Currents - http://tidesandcurrents.noaa.gov/index.shtml • Seattle Tide Gauge - http://tidesandcurrents.noaa.gov/station_info.shtml?stn=9447130+SEATTLE,+PUGET+SOUND,+WA • IPCC - http://www.ipcc.ch/ • Shaun O’Neil • 206.684.1671 • Shaun.O’Neil@kingcounty.gov

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