3_Presentation of Water Forward 2024 Preliminary Portfolio Evaluation Results — original pdf

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Water Forward 2024 Preliminary Portfolio Evaluation Results August 13, 2024 Agenda  Water Forward 2024 Process  Preliminary Portfolio Evaluation Results  Next Steps 2 Austin’s Water Supply: 325,000 Acre Feet Per Year 3 Colorado River: • Combination of State-granted water rights & long-term contract with LCRA • Up to 325,000 acre-feet per year (afy) LCRA reservation & use fees pre-paid in 1999 • Additional use payments trigger when average for 2 consecutive years exceeds 201,000 afy Centralized Reclaimed System Water Forward 2024 (WF24) Process 4 Define our values and future water needs Identify and characterize potential strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Updated Mission Statement 5 The purpose of Water Forward is to develop and implement diverse and environmentally conscious water management strategies to adapt to growth, drought, and climate change and ensure a sustainable, resilient, equitable, and affordable water future for our community for the next 100 years. Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Updated Guiding Principles Water Forward 2018 Guiding Principles Water Forward 2024 Guiding Principles Avoid severe water shortages during drought. Create a plan that is resilient to growth, drought, and climate change. 6 Continue Austin’s focus on water conservation and water use efficiency. Recognizing that Colorado River water is Austin’s core supply, continue a strong partnership between the City and LCRA to assure its reliability. Align with Imagine Austin’s “Sustainably Manage Our Water Resources Priority Program.” Maintain coordination and communication with regional partners. Engage the public and stakeholders throughout the plan development process. Continue to protect Austin’s natural environment, including source and receiving water quality. Focus on projects that are technically, socially, and economically feasible. Ensure Austin’s water supply continues to meet/exceed all federal, state, and local public health regulations. Strengthen long term sustainability, reliability, and diversity of Austin’s water supply through maximizing local water resources. Include diverse water management strategies that make use of all water sources, including reuse, conservation, and efficiency. Use a holistic and inclusive approach to water resource planning that incorporates the Austin community’s values. Use an equity and affordability lens to develop and implement the plan. Protect the health of the Colorado River and natural environment. Minimize implementation and operational risk. Focus on locally available water supplies. Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Updated Objectives Water Forward 2018 Water Forward 2024 Objective Sub-Objective Objective Sub-Objective Objective Weight Sub-Objective Weight Objective Weight Sub-Objective Weight Water Supply Benefits Minimize vulnerability Maximize reliability Economic Benefits Social Benefits Maximize cost-effectiveness Maximize external funding Maximize multi-benefit programs Maximize net benefits to local economy Maximize social equity Minimize ecosystem impacts Environmental Benefits Minimize net energy use Implementation Benefits Maximize water use efficiency Minimize risk Maximize local control/local resource 35% 20% 13% 20% 12% 28% 7% 15% 5% 5% 4% 4% 8% 6% 6% 7% 5% Water Supply Benefits Maximize reliability and resiliency, minimize vulnerability Maximize portfolio diversity Economic Benefits Maximize cost-effectiveness Equity Benefits Maximize positive benefits and minimize negative impacts for marginalized communities Environmental Benefits Minimize ecosystem impacts Minimize net energy use Maximize water use efficiency Minimize water quality impacts Implementation Benefits Minimize implementation and operational risk 40% 20% 8% 20% Maximize distribution and collection system resiliency 12% Maximize local control/local resource 7 35% 5% 20% 8% 4% 6% 6% 4% 3.5% 3.5% 5% Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Developed Equity and Affordability Roadmap 8 Reliable Supply Protects Public Health Accountable Affordable Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Defined Modeling Scenarios 9 Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Projected Baseline Water Demands Water Forward 2024 Historic and Projected Baseline Water Demands 10 Wholesale Single Family Residential Multifamily Residential Commercial City of Austin Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Developed Climate and Streamflow Projections Monthly streamflow at the Colorado River at Austin river gauge, 2081-2100 11 SSPs 2081-2100 Flow in the Colorado River decreases in more severe climate change scenarios 75th Percentile River Flow Median River Flow 25th Percentile River Flow Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Modeled Future Supply Needs Breakdown of unmet Austin demand due to zero lake storage, by volume and planning horizon 12 s o i r a n e c S f o % 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% No unmet Austin demand Cumulative 12-month unmet Austin demand less than 100,000 acre feet Cumulative 12-month unmet Austin demand less than 200,000 acre feet Cumulative 12-month unmet Austin demand less than 300,000 acre feet 2030 2040 2050 2060 2070 2080 2120 Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Identified Strategies 13 Utility-Side Water Loss Control Native and Efficient Landscapes Customer Side Water Use Management Non-Potable Reuse Water Supply Storage Potable Reuse Water Rights and Water Supply Contracts New Water Supplies Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Developed Strategy Cost and Yield 2080 Conservation and Reuse Strategy Yields and Annual Unit Costs 30,000 25,000 20,000 15,000 10,000 5,000 0 ) r a e Y r e P t e e F e r c A ( e g n a R d e Y l i l a u n n A 0 2 1 2 14 $9,000 $8,000 $7,000 $6,000 $5,000 $4,000 $3,000 $2,000 $1,000 $0 ) r a e Y r e P t e e F e r c A r e P $ ( t s o C t i n U d e z i l a u n n A Utility Side Water Loss Control Customer Side Water Use Management Native and Efficient Landscapes Centralized Reclaimed Onsite Reuse Decentralized Reclaimed Annualized Unit Cost (Dollars Per Acre Foot Per Year) Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Developed Strategy Cost and Yield 2080 Suppply Strategy Yields and Annual Unit Costs 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 ) r a e Y r e P t e e F e r c A ( e g n a R d e Y l i l a u n n A 0 8 0 2 - 15 $6,000 $5,000 $4,000 $3,000 $2,000 $1,000 $0 ) r a e Y r e P t e e F e r c A r e P $ ( t s o C t i n U d e z i l a u n n A Aquifer Storage and Recovery New Off Channel Reservoir New Off Channel Reservoir with Reuse Decker Lake Off Channel Reservoir Direct Potable Reuse Indirect Potable Reuse New Lower Colorado River Supply Brackish Groundwater Desalination Seawater Desalination Interbasin Transfer Conventional groundwater 2080 Annual Yield Range (Acre Feet Per Year) Annualized Unit Cost (Acre Feet Per Year) Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach WAVE Analysis Results 16 Developed portfolios • Portfolios were identified for further analysis based on the highest water supply reliability possible for a range of costs. • After a certain point, the additional reliability achieved decreases for each unit of cost increase. 120% 100% 80% 60% 40% 20% t s o C d e a c S l Max Candidate portfolio results Portfolio 10 Optimal results for rel. res., and vul. Identified portfolios Portfolio 1 Min 0% Portfolio 6 75% 80% 85% 90% 95% 100% Performance Score Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Developed portfolios Strategy 1 2 3 4 5 6 7 8 9 10 2080 Portfolios 17 n o i t a v r e s n o C l e b a t o P - n o N s u e R l y p p u S r e t a W e g a r o t S l e b a o P t e s u e R - r t n o C s t c a t r e a W w e N s e i l p p u S s e i l p p u S e b a o P t l Utility-Side Water Loss Control Customer-Side Water Use Management Native & Efficient Landscaping e Centralized Reclaimed Decentralized Reclaimed Onsite Reuse Aquifer Storage and Recovery New Off Channel Reservoir New Off Channel Reservoir with Reuse Decker Lake Off Channel Reservoir Direct Potable Reuse Indirect Potable Reuse New Lower Colorado River Supply Brackish Groundwater Desalination Seawater Desalination Interbasin Transfer Conventional Groundwater x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Select the best portfolio and implementation approach Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Portfolio 1 Water Supply Benefits Portfolio 1 in 2080 in a Medium Severity Climate Change Scenario 18 Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Portfolio 6 Water Supply Benefits Portfolio 6 in 2080 in a Medium Severity Climate Change Scenario 19 Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Portfolio 10 Water Supply Benefits Portfolio 10 in 2080 in a Medium Severity Climate Change Scenario 20 Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach All 2080 Portfolio Scores 2080 Portfolio Scores 21 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 Portfolio 1 Portfolio 2 Portfolio 3 Portfolio 4 Portfolio 5 Portfolio 6 Portfolio 7 Portfolio 8 Portfolio 9 Portfolio 10 Water Supply Benefits Economic Benefits Equity Benefits Environmental Benefits Implementation Benefits Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Recommended portfolio 22 Utility-Side Water Loss Control • Production meter improvements • Expanded active leak detection programs • Additional analysis of smart meter data Customer Side Water Use Management • Expanded customer incentives for conservation • Use of smart meter data for customer-side leak identification, education, and outreach • Water use budgeting Native & Efficient Landscapes • New landscape ordinances & incentives • • Irrigation efficiency incentives Landscape conversion programs Non-Potable Reuse • Onsite Water Reuse Systems • Decentralized Reclaimed • Centralized Reclaimed Water Supply Storage Aquifer Storage and Recovery Decker Lake Off Channel Reservoir Potable Reuse Indirect Potable Reuse New Water Supplies Brackish Groundwater Desalination Strategies reliant on Colorado River and LCRA supplies Define our values and needs Identify and characterize strategies Develop and evaluate portfolios of strategies Select the best portfolio and implementation approach Portfolio 6 Conservation Strategies 23 2080 Portfolios All volumes in max annual yield, acre-feet per year Strategy 2030 2040 2050 2060 2070 2080 Utility-Side Water Loss Control Customer-Side Water Use Management Native & Efficient Landscaping 2,800 7,500 9,400 11,300 13,200 15,000 200 2,100 3,800 5,500 7,200 8,800 600 1,800 2,900 3,900 5,000 6,100 TOTAL 3,600 11,400 16,100 20,700 25,400 29,900 Portfolio 6 Non-Potable Reuse Strategies 2080 Portfolios All volumes in max annual yield, acre-feet per year 24 Strategy 2030 2040 2050 2060 2070 2080 Centralized Reclaimed 1,100 8,200 12,900 17,600 22,300 26,900 Decentralized Reclaimed 0 200 500 800 1,100 1,300 Onsite Reuse 1,100 4,000 5,700 7,300 9,000 10,600 TOTAL 2,200 12,400 19,100 25,700 32,400 38,800 Portfolio 6 Potable Supply Strategies 25 2080 Portfolios All volumes in max annual yield, acre-feet per year Strategy 2030 2040 2050 2060 2070 2080 Aquifer Storage and Recovery Decker Lake Off Channel Reservoir 44,500 44,500 44,500 44,500 44,500 18,300 18,300 18,300 18,300 18,300 Indirect Potable Reuse *** *** 22,400 22,400 22,400 22,400 Brackish Groundwater Desalination 0 0 0 20,000 40,000 TOTAL 62,800 85,200 85,200 105,200 125,200 0 0 0 0 26 What’s Next? Meeting Timeline and Topics  8/27 & 8/28 Public Open Houses • AW presentation of and public feedback on recommended WF24 portfolio  8/29 Water Forward Task Force Meeting WCP/DCP • Further Task Force discussion of staff recommended WF24 portfolio • Further Task Force discussion of WCP/DCP revisions • Staff to present preliminary Colorado River Land Analysis recommendations  9/10 Water Forward Task Force Meeting • Staff to present draft WF24 plan report • Staff to present revised WCP/DCP  9/26** Water Forward Task Force Meeting • Feedback from Task Force on revised WF24 plan • Feedback from Task Force on further revised report WCP/DCP  10/8 Council Work Session • Staff to present on WF24 plan report, Revised  10/8 Water Forward Task Force Meeting • Task Force Action: Recommendation to Council on WF24 plan report, Revised WCP/DCP  10/9 Water and Wastewater Commission Meeting • WWC Action: Recommendation to Council on WF24 plan report, Revised WCP/DCP  11/7 Council Meeting • Council Action: Council consideration of WF24 Plan, Revised WCP/DCP Questions? Detailed Backup Material Water Forward 2018 (WF18) Statement of Purpose 29 The Integrated Water Resource Plan will provide a mid- and long-term evaluation of, and plan for, water supply and demand management options for the City of Austin in a regional water supply context. Through public outreach and coordination of efforts between City departments and the Austin Integrated Water Resource Planning Community Task Force (Task Force), the IWRP offers a holistic and inclusive approach to water resource planning. The plan embraces an innovative and integrated water management process with the goal of ensuring a diversified, sustainable, and resilient water future, with strong emphasis on water conservation. WF24 Methodology Overview Links to Posted Material  May 7, 2021 Water Forward Task Force Meeting • Water Forward 2023 Preliminary Planning  November 3, 2021 Water Forward Task Force Meeting • Water Forward 2024 Planning Update WF24 Detailed Methodology Goal Define the needs Evaluate potential solutions Identify potential solutions Select the best solution & implementation strategy Ongoing community engagement and equity work Tasks Develop range of future scenarios WF18 implementation evaluation and update Preliminary needs assessment Identify, screen, and characterize additional strategies Use optimization model to identify top-performing strategies over all scenarios Construct 50-year portfolios for further evaluation 50-year portfolio trade-off analysis Preferred 50-year portfolio & equity and affordability analysis Conduct vulnerability assessment to identify system stressors Adaptive Management Plan Outcome Updated WF18 strategies and range of baseline needs Strategy variables and rules for testing Evaluated 50-year portfolios and identified system stressors Water Forward 2024 Plan Timeline 2022 31 Fall 2024 WF24 Guiding Principles and Objectives Links to Posted Material 32  February 11, 2022 Water Forward Task Force Meeting • Draft WF24 Mission Statement, Guiding Principles, and Objectives  May 3, 2022 Water Forward Task Force Meeting • WF24 Mission Statement, Guiding Principles, Objectives, and Performance Measures 33 WF18 Objectives and Performance Measures Objective Sub-Objective Performance Measure Data Source Water Supply Benefits Economic Benefits Minimize vulnerability % of demand met during 12-months of worst-case drought Maximize reliability % of months in period of simulation with no need shortages Maximize cost-effectiveness Unit cost as present value sum of lifecycle cost vs. water yield provided ($/acre foot) Portfolio Characterization Maximize external funding External funding score (40%) and developer contribution score (60%) Social Benefits Maximize multi-benefit programs Multiple benefit score Maximize net benefits to local economy Local economy score Environmental Benefits Implementation Benefits Maximize social equity Social equity and environmental justice score Minimize ecosystem impacts Minimize net energy use Ecosystem impact score, net diversions and stormwater capture Incremental change in energy requirement (Millions of kWh/yr) Portfolio Characterization 20% Maximize water use efficiency 2115 potable water per capita demand (GPCD) Portfolio Characterization Minimize risk Portion of supply mix considered relatively high in risk Qualitative Maximize local control/local resource Portion of locally-controlled supply Qualitative Water Availability Modeling Water Availability Modeling Qualitative Qualitative Qualitative Qualitative Qualitative Objective Weight Sub- Objective Weight 35% 20% 13% 12% 28% 7% 15% 5% 5% 4% 4% 8% 6% 6% 7% 5% WF24 Objectives and Performance Measures Objective Sub-Objective Performance Measure Data Source Water Supply Benefits Maximize reliability and resiliency, minimize vulnerability Water Availability Modeling results Water Availability Modeling Maximize portfolio diversity Portfolio diversity score Portfolio Characterization Objective Weight Sub-Objective Weight 34 Economic Benefits Maximize cost-effectiveness Cost (lifecycle, capital, operations and maintenance) Strategy Characterization 20% Equity Benefits Minimize impacts and maximize benefits of plan outcomes for marginalized communities Equity and affordability score Equity & Affordability Tool 8% Environmental Benefits Minimize ecosystem impacts Net return flows Water Availability Modeling Minimize net energy use Operational energy use Strategy Characterization Maximize water use efficiency Potable GPCD Portfolio Characterization Minimize water quality impacts Water quality impact score Qualitative Minimize implementation and operational risk Implementation and operational risk score Qualitative Implementation Benefits Maximize water distribution and wastewater collection system resiliency System resiliency benefits Qualitative Maximize Local Control/Local Resource Volume of local and AW-controlled water resources Portfolio Characterization 40% 20% 12% 35% 5% 20% 8% 4% 6% 6% 4% 3.5% 3.5% 5% WF24 Objective Descriptions 35 Objective Objective Description Sub-Objective Water Supply Benefits -Avoid severe water shortages during drought and a variety of climate change scenarios -Include diverse water management strategies that make use of all water sources Maximize portfolio diversity Maximize reliability and resiliency, minimize vulnerability Economic Benefits -Evaluate affordability impacts in a holistic manner that balances near-term and long-term costs Maximize cost-effectiveness Equity Benefits -Minimize negative impacts and maximize positive benefits of plan outcomes for marginalized communities Minimize impacts and maximize benefits of plan outcomes for marginalized communities Environmental Benefits -Develop strategies that continue to protect the natural environment, including source and downstream water quality Minimize ecosystem impacts Minimize net energy use Maximize water use efficiency Minimize water quality impacts Implementation Benefits -Develop strategies that are technically, socially, and economically feasible and can be implemented and operated with a manageable level of risk -Develop strategies that make use of locally available and AW- controlled water resources Minimize implementation and operational risk Maximize water distribution and wastewater collection system resiliency Maximize Local Control/Local Resource 36 WF24 Performance Measure Descriptions Performance Measure Performance Measure Description Water Availability Modeling results Portfolio diversity score Arithmetic average of the reliability, vulnerability, and resiliency score of a portfolio for all hydrologies in all planning horizons. Effective Number of Sources (ENS) result for water management strategies (WMS) in each portfolio as grouped by source type. Cost (lifecycle, capital, operations and maintenance) Volume-weighted average unit cost (capital, operations and maintenance) for the 2080 portfolio max annual yields. Equity and affordability score Equity impacts and benefits for water management strategy implementation and mitigation strategies. Net return flows Calculated net return flows for 2080 in period of record hydrology. Operational energy use 2080 yield-weighted operational energy use from Unified Cost Model cost estimates. Potable GPCD Water quality impact score Potable Gallons Per Capita Per Day (GPCD) in 2080 with max annual yield from all portfolio water management strategies. 2080 yield-weighted qualitative assessment of water quality impacts by Water Management Strategies, averaged over the whole portfolio. Implementation and operational risk score 2080 yield-weighted qualitative assessment of risks by WMS, averaged over the whole portfolio. System resiliency benefits 2080 yield-weighted qualitative assessment of system resiliency by WMS, averaged over the whole portfolio. This is intended to capture benefits to AW's centralized distribution and collection systems. Volume of local and AW-controlled water resources Percent of 2080 portfolio max annual yield made up of local and AW-controlled water resources. WF24 Equity and Affordability Roadmap Links to Posted Material 37  December 12, 2022 Water Forward Task Force Meeting • Equity Grounding  April 11, 2023 Water Forward Task Force Meeting • Draft Equity and Affordability Roadmap WF24 Equity and Affordability Framework Themes Questions 1.1 Given that marginalized communities can be the most impacted by emergency situations, how does the strategy impact/benefit Austin Water’s access to water supply, especially during drought or other emergency situations? 38 1.2 How does the strategy benefit Austin Water’s water, reclaimed water, and/or wastewater infrastructure resilience? 1.3 Does this strategy create an inequitable maintenance burden for Austin Water customers who are a part of marginalized communities? 1.4 Does this strategy include energy resilience components? 1.5 Can this strategy be tailored to help improve water, reclaimed water, and/or wastewater service to marginalized communities? 2.1 How does the proposed strategy help equitably restore, protect, or impact public or ecosystem health (air, land, water, soil)? 2.2 Does the proposed strategy include policy and/or regulatory requirements that pose barriers to marginalized communities accessing the benefits of the strategy? 2.3 Does the strategy include regulatory requirements that place inequitable burdens on marginalized communities? 2.4 Does the strategy impact and/or benefit source water, receiving water, and/or drinking water quality? 3.1 How will AW track and publicly report strategy implementation outcomes related to equity and affordability? Accountability 3.2 How will AW create a system for the community to provide feedback during implementation if inequitable outcomes are identified? What processes could be created to potentially adapt water management strategies during implementation or develop new mitigation strategies to address these concerns? 3.3 What approaches could AW use to make access to these strategies available? 3.4 Does the strategy require behavioral change from the public? Does this behavior change impact marginalized communities more than others? 3.5 How does this strategy increase equitable access to information and education opportunities to increase community knowledge about water? 4.1 Are there rate/financial impacts and/or benefits of this strategy? What are the opportunities to mitigate the rate/financial impacts for marginalized communities? 4.2 How does this strategy economically impact or benefit vulnerable communities? Are there existing assistance programs that can be used to address the impacts? 4.3 How can this strategy best leverage growth and development to maximize the sustainability and resiliency of our water resources for all? 4.4 How does the strategy enhance workforce development opportunities for vulnerable communities? Water Supply Reliability -Access to water -Infrastructure resilience Public Health -Water quality -Environment -Transparency -Accessibility -Community outreach and education Affordability and Economic Impacts -Rate impacts -Growth and development -Workforce development WF24 Climate Projections Link to Posted Material  September 20, 2022 Water Forward Task Force Meeting • Update on WF24 Climate and Hydrology Analysis 39 WF24 Population Projections Link to Posted Material  December 12, 2022 Water Forward Task Force Meeting • Water Forward 2024 Population and Employment Projections 40 WF24 Current Population Projections 41 Austin Water Served Population Low Projection Medium Projection High Projection 1,065,000 1,475,000 1,524,000 1,576,000 2,321,000 2,458,000 2,602,000 2,866,000 3,209,000 3,594,000 Year 2020 2040 2080 2120 WF24 Baseline Demand Projections Links to Posted Material 42  May 9, 2023 Water Forward Task Force Meeting • Water Forward 2024 Disaggregated Demand Model Overview  September 12, 2023 Water Forward Task Force Meeting • Overview of Water Forward 2024 100-year water demand projections WF24 Current Baseline Water Demand Projections 43 450,000 400,000 350,000 300,000 250,000 200,000 150,000 100,000 50,000 t e e F - e r c A 0 2010 Austin Water Baseline Water Demand Projections (Consumption – Acre Feet) Year 2020 2040 2080 2120 Low Projection Medium Projection High Projection 130,740 177,780 277,950 332,930 130,740 182,960 291,870 366,470 130,740 188,310 306,620 405,390 2030 2050 2070 2090 2110 WF24 Demand Low WF24 Demand Med WF24 Demand High WF18 Demand Historical Consumption WF24 Colorado River Land Analysis Link to Posted Material 44  May 9, 2023 Water Forward Task Force Meeting • Colorado River Land Analysis Overview WF24 Preliminary Needs Analysis Link to Posted Material 45  November 30, 2023 Water Forward Task Force Meeting • Water Forward 2024 Preliminary Needs Analysis 46 WF24 Initial List of Water Management Strategies Links to Posted Material  November 30, 2023 Water Forward Task Force Meeting • Presentation of Water Forward 2024 initial list of water management strategies  January 9, 2024 Water Forward Task Force Meeting • Presentation of Water Forward 2024 initial list of water management strategies and initial feedback from Task Force on strategies and portfolio themes 47 WF24 Water Management Strategy Characterization Links to Posted Material  April 15, 2024 Water Forward Task Force Meeting • Presentation of Water Management Strategy costs and yields  July 15, 2024 Water Forward Task Force Meeting • Water Management Strategy Characterization Sheets WF24 Water Management Strategy Descriptions Supply Conservation* *Reuse and conservation strategies will use ordinances, incentives, and other programs as part of implementation.  Water Efficient and Native Landscapes: Setting requirements for landscaping and using irrigation systems for new single-family homes.  System Water Loss Control: Reducing leaks throughout the water distribution system.  Customer Side Data-Driven Water Use Management: Using Advanced Metering Infrastructure and water use benchmarking data with water use budgeting tools to reduce customer water use. Reuse* *Reuse and conservation strategies will use ordinances, incentives, and other programs as part of implementation.  Onsite Water Capture and Reuse: Increasing capture and reuse of rainwater, stormwater, graywater, blackwater, and air conditioning condensate onsite at commercial and multifamily properties for non-drinking water purposes.  Centralized Reclaimed Water: Expanding the reclaimed water system to meet growing non- drinking water needs, such as irrigation, cooling systems, manufacturing, and toilet flushing.  Decentralized Reclaimed Water: Using smaller, localized treatment facilities to provide reclaimed water to specific customers and communities for non-drinking water purposes.  Aquifer Storage and Recovery: Storing Austin’s existing water supplies in a natural aquifer during plentiful times to be used during droughts and emergencies.  Indirect Potable Reuse: Redirecting treated wastewater to water treatment plants to be recycled and treated for drinking purposes during a drought emergency. When not in drought, IPR infrastructure could be used in the reclaimed system and to capture local inflows into Lady Bird Lake.  Brackish Groundwater Desalination: Withdrawal and desalination of salty groundwater for treatment to potable drinking water.  New Off Channel Reservoir, Colorado River (CR) Water, or CR and Reclaimed Water: Constructing a new off-channel reservoir that would be owned and operated by Austin Water and supplied with water from the CR, or a mix of CR and reclaimed water.  Decker Lake Off-Channel Reservoir: Using Decker Lake as an off-channel reservoir supplied by Colorado River or reclaimed water with lake levels fluctuating within a limited range.  Additional Supply from LCRA or Regional Partners: Securing additional surface water supplies from the LCRA or a regional partner through a new or amended contract.  Seawater Desalination: Sourcing drinking water from the Gulf of Mexico by removing salts by forcing the water through membranes at high pressure.  Conventional Groundwater: Withdrawing, treating, and conveying groundwater to Austin for drinking water use.  Direct Potable Reuse: Purifying highly treated reclaimed water using advanced treatment to use as drinking water.  Interbasin Transfers: Importing surface water supplies to Austin from outside of the Colorado River basin. WF24 Portfolio Development Links to Posted Material 49  July 15, 2024 Water Forward Task Force Meeting • Update on Refined Water management strategy Assessment and Vulnerability Evaluation (WAVE) results and 50-year portfolios WF18 Final Portfolio 50 Commercial, Industrial, and Institutional (CII) Ordinances Strategy Advanced Metering Infrastructure (AMI) Utility-Side Water Loss Control Water Use Benchmarking and Budgeting Landscape Transformation Ordinance Landscape Transformation Incentive Irrigation Efficiency Incentive 2020 600 3,110 1,060 40 100 Onsite Water Reuse Sewer Mining e s u e R Decentralized Reclaimed Centralized Reclaimed s Aquifer Storage and Recovery e Indirect Potable Reuse through Lady Bird Lake Capture Local Inflows to Lady Bird Lake Brackish Groundwater Desalination New Off Channel Reservoir n o i t a v r e s n o C l e b a t o P - n o N i l p p u S e b a t o P l Yield Targets (acre-feet/year) 2040 3,880 2070 5,770 2115 9,370 9,330 10,918 13,060 1,060 1,060 1,060 5,950 11,670 25,230 3,040 7,430 15,050 320 210 630 430 930 390 6,410 16,900 37,230 1,000 2,210 5,280 3,560 14,470 30,050 60,000 60,000 60,000 11,000 20,000 20,000 3,000 3,000 3,000 5,000 16,000 25,000 25,000 5,000 15,480 25,000 54,600 WF24 2080 Portfolios for Evaluation Strategy 1 2 3 4 5 6 7 8 9 10 2080 Portfolios All volumes in max annual yield, acre-feet per year 51 n o i t a v r e s n o C l e b a t o P - n o N s e i l p p u S e b a t o P l Utility-Side Water Loss Control Customer-Side Water Use Management Native & Efficient Landscaping e Centralized Reclaimed s u e R Decentralized Reclaimed Onsite Reuse Aquifer Storage and Recovery Brackish Groundwater Desalination Indirect Potable Reuse New Off Channel Reservoir New Off Channel Reservoir with Reuse Decker Lake Off Channel Reservoir New Lower Colorado River Supply Seawater Desalination Direct Potable Reuse Interbasin Transfer Conventional Groundwater 15,000 15,000 15,000 15,000 15,000 15,000 15,000 15,000 15,000 15,000 8,800 8,800 8,800 8,800 8,800 8,800 8,800 8,800 8,800 8,800 6,100 6,100 6,100 6,100 6,100 6,100 6,100 6,100 6,100 6,100 26,900 26,900 26,900 26,900 26,900 26,900 26,900 26,900 26,900 26,900 1,300 1,300 1,300 1,300 1,300 1,300 1,300 1,300 1,300 1,300 10,600 10,600 10,600 10,600 10,600 10,600 10,600 10,600 10,600 10,600 6,000 6,000 44,500 6,000 44,500 44,500 44,500 44,500 83,000 83,000 25,000 10,000 40,000 40,000 40,000 40,000 40,000 22,400 22,400 22,400 22,400 22,400 22,400 22,400 9,600 9,600 18,300 18,300 18,300 17,500 10,000 25,000 5,000 22,400 22,400 22,400 40,000 10,000 20,000 20,000 20,000 WF24 2080 Portfolio Evaluation Results 52 Reliability, Resiliency, & Vulnerability Score (%) 2080 Potable Gallons per Capita per Day MCDMA Performance Metric Portfolio 1 Portfolio 2 Portfolio 3 Portfolio 4 Portfolio 5 Portfolio 6 Portfolio 7 Portfolio 8 Portfolio 9 Portfolio 10 88.2% 88.8% 89.2% 89.5% 90.5% 91.1% 90.8% 92.0% 92.2% 93.2% Portfolio Diversity (ENS) 1.06 1.48 1.43 99 1.16 99 1.05 99 99 99 99 1.54 99 1.48 99 1.49 99 1.50 99 1.45 Cost ($/AF/yr) $2,832 $2,422 $2,260 $2,817 $2,417 $2,421 $2,629 $2,761 $2,734 $2,858 Equity and Affordability (Qual.) 3.3 3.24 3.24 3.26 3.17 3.21 3.16 3.2 3.13 3.12 Net Return Flows (AF/yr) 110,143 110,157 125,694 106,319 124,916 120,405 122,140 94,077 102,622 42,772 Operational Energy Use (M-kW-hrs) 1,302,540 1,622,708 9,600,295 5,467,892 11,421,084 16,288,257 16,835,033 16,846,851 25,787,327 34,237,945 Water Quality Impacts (Qual.) Implementation and Operational Risk (Qual.) 3.11 3.98 2.88 3.77 2.91 3.54 2.66 3.77 2.78 3.51 2.52 3.47 2.47 3.15 2.51 3.13 2.43 2.95 2.34 2.81 System Resiliency Benefits (Qual.) 3.76 4.02 3.95 3.69 3.98 3.85 3.68 3.51 3.68 3.63 Volume of local and AW-controlled water resources (%) 100% 100% 100% 100% 100% 100% 100% 89% 93% 91%