Miami-Dade Water & Sewer Department. Miami-Dade Water and Sewer Department 1

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1 Miami-Dade Water & Sewer Department Miami-Dade Water and Sewer Department 1

2 Miami-Dade Water and Sewer Department (WASD) Largest Water & Sewer Utility in the Southeastern United States Serving more than 2.3 million residents FY Budget: Operating Budget $758 Million $13.3 Billion Multi-Year Capital Plan 2,824 Total Budgeted Positions 2

3 Water & Wastewater Treatment Facilities 3

4 Existing Potable Water Treatment Infrastructure 3 Regional & 5 smaller Water Treatment Plants 100 Water Supply Wells Supplying an average of 310 million gallons per day (MGD) 8,206 miles of pipes Hialeah Water Treatment Plant Alexander Orr Water Treatment Plant Preston Water Treatment Plant In Service Since 1924 In Service Since 1954 In Service Since 1968

5 Existing Wastewater Treatment Infrastructure 3 Wastewater Treatment Plants 2 Ocean Outfalls 21 Deep Injection Wells Collecting, treating, and disposing and 300 million gallons per day (MGD) 6,309 miles of mains and laterals 1,047 sewer pumps stations Central Wastewater Treatment Plant North Wastewater Treatment Plant South Wastewater Treatment Plant In Service Since 1956 In Service Since 1979 In Service Since 1983

6 Capital Improvement Program Pump Station Upgrades Federally Mandated Upgrades State Mandated Ocean Outfall Other Water & Sewer Projects $215 MILLION $1.6 BILLION $5.2 BILLION $6.4 BILLION 138 CAPITAL PROJECTS 82 CAPITAL PROJECTS 62 CAPITAL PROJECTS 100s CAPITAL PROJECTS

7 Climate Change Impacts Drought conditions Sea Level Rise (SLR) Saltwater intrusion in water supply wellfields Increased flooding and infiltration and inflow Impacts from storm surges on coastal facilities 7

8 Resolutions Support from our Governing Body. The Southeast Florida Regional Climate Change Compact created in 2010 Broward, Miami-Dade, Monroe, and Palm Beach Counties To coordinate mitigation and adaptation activities across county lines. Miami-Dade County also formed the Office of Resiliency The Board of County Commissioners has approved the following resolutions: R-44-15: study feasibility of implementing Adaptation Action Areas R-45-15: ensure implementation of Climate Change Advisory Task Force Recommendations R-46-15: Develop formal adaptation planning process R-48-15: Continue to work with the Compact and S. FL Water Management District to address flood and sea level rise threats. R May 6, 2014 requiring all County infrastructure projects to consider potential impacts of sea level rise. R October 6, 2015 related to sea level rise for zoning applications and the comprehensive development Master Plan. 8

9 Assessment of Sea Level Rise/Salt Water Intrusion to Water Supply Wellfields Entered into Joint Funding Agreements with USGS for: Assessment of Seawater Encroachment Monitoring Network ($1.8 M) Development of an Integrated Model of Surface and Groundwater, including evaluation of sea level rise caused saltwater intrusion into water supply wellfields ($2.7 M) Water Resources Investigations, including ongoing monitoring of the salt front network ($5.6 M) 9

10 CANALS, STRUCTURE AND PUMP STATIONS 10

11 Over the next 30 years the existing surfacewater system can be effectively used to control saltwater intrusion in the Biscayne aquifer in areas where land surface elevations exceed expected high tides 11

12 Criteria used for Infrastructure Design 12

13 Design Elevations for Existing and New Facilities (WWTPs) WWTP Summary of Design Criteria for Hardening against Flooding from Surge, Sea Level Rise and Extreme Storm Events. Existing WWTP Facility Assets New WWTP Facility Assets ft NGVD29 Basis ft NGVD29 Basis CDWWTP 16.0 FEMA BFE + 3ft SLR from SEFLCC(2011) +FB +SF Surge+1.23m(48")SLR + FB +SF+21 (100-yr, 72-hr rainfall) SDWWTP 16.0 FEMA BFE + 3ft SLR from SEFLCC(2011) +FB +SF Surge+1.23m(48")SLR + FB +SF+21 (100-yr, 72-hr rainfall) NDWWTP 16.0 Same as CDWWTP and SDWWTP Surge+1.23m(48")SLR + FB +SF+21 (100-yr, 72-hr rainfall) FB= Freeboard = 2.0 ft per ASCE Standard 24-05/2010 FBC Category IV SF= Safety Factor = 1.0 ft per 2014 MWH study at CDWWTP SLR = 1.23m = 48" per NOAA High projection for 2075 (USACE High projection is 0.93m) 13

14 Additional Ongoing Efforts Establish wave height at shoreline Lower intensity, more frequent surge event modeling Refine flooding inundation modeling for scenarios at WASD Pump Stations Prioritize Pump Stations based on risk of flooding Prioritize Pump Stations based on criticality 14

15 Exceptions Practicality of Measures Other Considerations 15

16 PS-21 Street View 16

17 PS-607 Recent Update 17

18 PS-21 Upgrade assuming PS-607 Design 18

19 Resiliency I encourage you to attend the Planning and Adaptation for Climate Change Impact workshop (Tuesday, November 15 - block 28) which discusses the path to utility resiliency. 19