Loading...
HomeMy WebLinkAboutItem 10 PPP 11-13-19 Admin Committee - SP-152 OCSD Climate ResiliencySP-152 Climate Resiliency Study Orange County Sanitation District Nasrin Nasrollahi, Senior Engineer Administration Committee November 13, 2019 Reducing Greenhouse Gas Emissions Regulatory Drivers EO-S-13-08State agencies to plan for sea level rise and climate impacts through coordination of the state Climate Adaptation Strategy. Assembly Bill 2800 State agencies shall consider impacts of climate change when planning, designing, building state infrastructure. (July 2020) OCSD Strategic Plan NPDES Permit It is anticipated that a “Climate Change Effects Vulnerability Assessment and Mitigation Plan” is required as part of the NPDES Permit Nov 2008 2019Sep 2016 Recent Climate Science References Planning Horizons for Vulnerability Assessment There is time to adapt, and time to course-correct through successive update cycles of the Resiliency Plan 2020 2050 2070 2100 30-Year Horizon Planning Horizon for New/Retrofitted Infrastructure Life-Cycle Planning Horizon for Most Assets Planning Horizon for Assets with Extended Life- Cycle Horizon 50-Year Horizon 80-Year HorizonCurrent Climate Forces Ventura Fire, California, Dec 2017. (@aghakouchak) The Cocos Fire burns in San Marcos, California, in 2014. (theatlantic.com) Map data provided by the California Public Utilities Commission Wildfire and Extreme Heat Flooding in Orange County King Tide 2012, 8th St and Coast Hwy, Huntington Beach, (OCREGISTER) Flooded streets in Newport Beach Storm Event 1983, OCREGISTER Flooded streets in Huntington Beach 1938 flood and Santa Ana Levee failure Storm Event, Dec 2010Balboa Island (www.scpr.org) Pacific Ocean Plant No. 2 Extreme Flow Events 266 (1990)184 (2018) 475 485 550 521 494 459 501 411 563 100 150 200 250 300 350 400 450 500 550 600 1980 1985 1990 1995 2000 2005 2010 2015 Fl o w ( M G D ) Year Average Monthly Flow (MGD) vs. Peak High Flow Events Total average flow Peak Flow Flooding 100-year FEMA Flood Maps (2019) Sea Level Rise (http://tidesandcurrents.noaa.gov/sltrends/sltrends.shtml) 20 1 8 19 2 6 Sea Level Rise (SLR) Projections Blue: emissions continue to rise throughout the 21st century Sea Level Rise (SLR) Projections Blue: emissions continue to rise throughout the 21st century Orange: emissions peak around 2040, then decline Sea Level Rise (SLR) Projections Blue: emissions continue to rise throughout the 21st century Orange: emissions peak around 2040, then decline 1.54 ft 3.71 ft Recommended range of sea level rise for future CIP projects Flooding and Sea Level Rise 100-year Flood + 2070 SLR Access to Pump Stations is Flooded Sea Level Rise Projection of 3.71 ft is assumed in 2070 Tsunami Runup Elevation American Society of Civil Engineers (ASCE) 7-16 Current maximum extent inundation zones. Adaptation Example ControlRoom Hatch PUMPSTATION PumpRoom Adaptation Example Barrier Barrier FLOOD PATHWAY ControlRoom Hatch FLOOD PATHWAY PUMPSTATION PumpRoom 100-yrFEMAFlood +2070SLR3.7ft 500-yr FEMA FloodwithoutSLR2019 100-yrFEMA Flood +2050SLR1.5ft 100-yrFEMA FloodwithoutSLR2019 Watertight replacement of drywell hatches Stop logs over doors or sealed doors Recommended Capital Improvements for Lido Pump Station 4 drywell hatches below flood level Flood pathway Adaptation Example Protecting the Treatment Plant Recommendation: Plant No. 2 Boundary Wall Summary of Impacted Facilities Study Recommendations Facility​Construction Cost​ Impacted​ Planning Horizon Slater​ Pump Station $0.5 million​Current, 2050, 2070​ Lido​ Pump Station $0.5 million​Current, 2050, 2070​ 15th Street​ Pump Station $0.1 million​2070​ A Street​ Pump Station $0.4 million​2070​ Plant No. 2 $28 million​2050, 2070​ OCSD Policy OCSD aims to design, maintain and operate valuable wastewater assets that withstand or adapt to adverse conditions in a reasonable manner that is both cost-effective and sustainable for present and future generations. These adverse conditions include heavy rains, flooding, sea level rise, earthquakes, tsunamis, extreme heat, wildfires and electrical grid interruptions. Questions?