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PLANNING FOR RISING SEA LEVELS NBWA November 5, 2010

PLANNING FOR RISING SEA LEVELS NBWA November 5, 2010. Preliminary Study Vulnerability Adaptation Strategies Next Steps. HASPA Hayward Area Shoreline Planning Agency. Potential inundation. Light Blue – 16 in Dark Blue – 55 in Source: USGS, BCDC. Functions. Urban Habitat

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PLANNING FOR RISING SEA LEVELS NBWA November 5, 2010

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  1. PLANNING FOR RISING SEA LEVELS NBWA November 5, 2010

  2. Preliminary Study • Vulnerability • Adaptation Strategies • Next Steps

  3. HASPA Hayward Area Shoreline Planning Agency

  4. Potentialinundation • Light Blue – 16 in • Dark Blue – 55 in Source: USGS, BCDC

  5. Functions • Urban • Habitat • Storm drainage • Land fill • Sewage treatment • Utility corridors • Trails Oro Loma Marsh Triangle Marsh Cogswell Marsh Alkali Flat Hayward Marsh Oliver BrothersProperty

  6. 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

  7. Oro Loma wastewatertreatment plant Functions • Urban • Habitat • Storm drainage • Land fill • Wastewater • Utility corridors • Trails Solar drying ponds KOFY Alameda County West Winton Ave City of Haywardwastewatertreatment plant

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

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

  10. Erosion

  11. Groundwater Elevation Levee slope increases as mudflat lowers and levee raised Armored levee

  12. Hold the Line

  13. Hold the Line Levee slope increases as mudflat lowers and levee raised Armored levee

  14. Realign Rapid landward movement increases as sea level rises

  15. Opportunities - Sediment • Trapped in channels in watershed • Trapped in marinas further alongshore • In the past, sources were more diffuse

  16. Opportunities - Freshwater • Large amount of freshwater passes through area • Opportunity to reconfigure EBDA line • In the past, sources were more diffuse

  17. Opportunities – Brackish Marsh • Historic element of the Bay • Greater biomass, wave attenuation and sediment trapping • Grow the marshes upwards • Steepen the existing natural shoreline • Adaptively respond to changes in sea level

  18. Gradual Steepening ImpermeableBermor Wall Seepage Berm Bay Rapid landward movement increases as sea level rises FreshwaterSwale Cut offwall Mudflat Tidal Marsh Brackish Marsh

  19. Gradual Steepening Treated Wastewater and Stormwater Overflow Wave Attenuation Seepage Rapid landward movement increases as sea level rises FreshwaterSwale Mudflat Tidal Marsh Brackish Marsh

  20. Gradual Steepening Rapid landward movement increases as sea level rises FreshwaterSwale Mudflat Tidal Marsh Brackish Marsh

  21. Fringing (attached) barrier beach Nearshore (detached) barrier beach

  22. Diffused Armoring

  23. Next Steps Master Plan Vulnerability Assessment Infrastructure Ecology Property Adaptation Strategy Interim Management

  24. Preview of the late 21st century? San Pedro Road, China Camp - January 2010 spring tide Photo: Peter Baye

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