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PREPARING FOR SEA LEVEL RISE IN SAN FRANCISCO BAY BC3 June 17, 2011 Jeremy Lowe, ESA PWA

PREPARING FOR SEA LEVEL RISE IN SAN FRANCISCO BAY BC3 June 17, 2011 Jeremy Lowe, ESA PWA. Mitigation - avoiding the unmanageable Adaptation - managing the unavoidable. 2000 - 0 in. 2100 55 in. 2050 14 in. 2100+ ?? in. 6.5ft NAVD - King Tide, January 2011 5.9ft NAVD – MHHW

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PREPARING FOR SEA LEVEL RISE IN SAN FRANCISCO BAY BC3 June 17, 2011 Jeremy Lowe, ESA PWA

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  1. PREPARING FOR SEA LEVEL RISE IN SAN FRANCISCO BAY BC3 June 17, 2011 Jeremy Lowe, ESA PWA

  2. Mitigation - avoiding the unmanageable Adaptation - managing the unavoidable

  3. 2000 - 0 in 2100 55 in 2050 14 in 2100+ ?? in

  4. 6.5ft NAVD - King Tide, January 2011 5.9ft NAVD – MHHW 0.6ft increase ~ 2010 - 2030

  5. Photo: Mark Songey, 02/17/11

  6. Photo: Heidi Nutters, 11:30am, 02/17/11

  7. Inundation Frank’s Dump West - New Year’s Eve 20058.9 ft tides; 40mph westerly winds Photo: Mark Taylor

  8. Erosion Hayward Marsh - New Year’s Eve 20058.9 ft tides; 40mph westerly winds Photo: Mark Taylor

  9. Functions • Urban • Habitat • Storm drainage • Land fill • Wastewater • Utility corridors • Trails

  10. Storm drainage • Designed for a certain bay elevation • Lack of drainage as MLLW rises • Structures fixed relative to tide frame • Upstream impacts will increase • Exposure increaseswith time • Adaptation mayrequire pumping • Opportunity toconsolidate

  11. Functions Railroad • Urban • Habitat • Storm drainage • Land fill • Sewage treatment • Utility corridors • Trails PGE Cable EBDA line HP Gas Bay trail

  12. Hold the Line

  13. Realign Rapid landward movement increases as sea level rises

  14. Terraced Levee Treated Wastewater and Stormwater Overflow Wave Attenuation Seepage Rapid landward movement increases as sea level rises FreshwaterSwale Mudflat Tidal Marsh Brackish Marsh

  15. An Adaptation Strategy? 0ft 1ft 2ft 3ft 4ft 5ft Existing levees Enhance existing wetlands, realign levees Terraced levees Terraced levees Realign functions Realign functions Threshold Lead Time Effective Decision

  16. Not an Adaptation Strategy San Pedro Road, China Camp - January 2010 spring tide Photo: Peter Baye

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