5/25/2017. What is projected for Coastal texas? PROTECTING CRITICAL WATER INFRASTRUCTURE FROM SEA LEVEL RISE

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1 PROTECTING CRITICAL WATER INFRASTRUCTURE FROM SEA LEVEL RISE What is projected for Coastal texas? Mean Sea Level has risen 3 18 to 37 above Mean Sea Level Mean Sea Level rose 8 8 to 13 above Mean Sea Level 33 to 87 above Mean Sea Level Source: Unified Climate Central Texas and the Surging Sea December Projected Impacts of Projected SLR/Storm Surge for coastal texas Cities at or below 5 of high tide inundated by 100-year storm By 2050 today s 100-year storm projected to be 5-year storm. More than 1000 square miles of land in Texas lie below 5 of the current high tide elevation. 4 Power plants and 254 listed EPA sites lie below this elevation. Source: Unified Climate Central Texas and the Surging Sea December 2014 City of Daytona Beach, Hurricane Matthew,

2 Impact Impact of of Sea Sea Level Level Rise Rise on Storm on Storm Surge Surge How Could water infrastructure be impacted? Impact of Sea Level Rise on Water Infrastructure Interruption of service Reduced stormwater system capacity Reduced effectiveness/failure of onsite WW treatment systems Increased risk of infiltration into water/wastewater infrastructure Increased overflow of partially treated and untreated wastewater Saltwater intrusion into fresh water aquifers and surface waters Increased rate of deterioration of piping systems Sewage overflow due to inflow/infiltration 2

3 Analysis of SLR-influenced impact 1. USE appropriate NOAA Projected SLR Curve. For high-risk infrastructure, use high projection for future SLR. For low-risk infrastructure, the low projection for future SLR can be used. Graphic Relative Sea Level Change (RSLC) Scenarios for Fernandina Beach, FL, as calculated using NOAA projections and regional corrections. (USACE, 2015) Source: NOAA August Determine Service Life of the facility. 3. Determine Event to be Evaluated. 4. Overlay GIS/Survey DATA of Site on same datum. 5. Determine projected flooding elevation. 6. analyze projected impact. 3

4 Climate Resilient Facility/facility hardening 1. Elevate/Relocate Infrastructure 2. Harden Facilities Waterproof Equipment Utilize Submersible Equipment Utilize Fiber Optic Cables Utilize Temporary Flood Barriers Flood Barriers 4

5 3. Facilitate restoration Modular Equipment Redundant Facilities Bypass Capabilities Emergency Power 4. Establish Plan to make facility climate resilient Assess Cost of Possible Hardening Strategies. Compare to No-Action Scenario. Complete Benefit/Cost Analysis of Various Strategies. Implement Plan. City of Daytona Beach, Hurricane Matthew Case Study: City of Largo Emergency Operations Center 5

6 Proposed City of Largo Wastewater Facilities Operations Building Elevations 2017 Cat 5 Storm Surge Elev: 24.2 Cat 4 Storm Surge Elev: 19.9 Cat 3 Storm Surge Elev: 15.8 Finish Floor 11 Cat 2 Storm Surge Elev: 10.9 Ground elevation 10 +/- Floodplain 9 Cat 1 Storm Surge Elev: 5.8 Projected Sea Level Rise Pinellas County Proposed City of Largo Wastewater Facilities Operations Building Elevations 2100 (High SLR) Cat 5 Storm Surge Elev: 31.0 Cat 4 Storm Surge Elev: Finish Floor 25 Cat 3 Storm Surge Elev: 22.6 Cat 2 Storm Surge Elev: 17.7 Floodplain 15.8 Cat 1 Storm Surge Elev: 12.6 Ground elevation 10 +/- 6

7 before after Action Items Parameter: Cat 5 high tide year 2100 Elevate Finish Floor of Ops Center to Elevation = 32.0 Elevate Critical Infrastructure to Elevation = 32.0 Elevate Emergency Power to Elevation = 32.0 Design Structure to withstand Cat V wind loads. Provide Parking underneath proposed structure. 7

8 Case Study #2-LS 87-City of Sarasota LS-87 City of Sarasota Design Event Design Life: Design Storm: Cat III Hurricane. SLR 2066 Projected: 3.1 feet. Design Storm Surge Elevation with SLR: Resilience Actions Elevate generators/controls to elevation Pumps/cables submersible. Structure designed to withstand hydrostatic pressure of surge. Smart vent technology used to wet floodproof structure. Remote stop/start capabilities through hardened/buried comm. network. Thank you for the opportunity. Questions 8