Backup_Appendix J_Portfolio Development and Evaluation — original pdf

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APPENDIX J: PORTFOLIO DEVELOPMENT AND EVALUATION The top ten candidate portfolios were evaluated as described in the following tables: • Table J-1 Water Forward 2024 Objectives and Performance Measures • Table J-2 Water Forward 2024 Objective Descriptions • Table J-3 Water Forward 2024 Performance Measure Descriptions • Table J-4 Water Forward 2024 Equity and Affordability Framework • Table J-5 Water Forward 2024 2080 Portfolios for Evaluation • Table J-6 Water Forward 2024 Raw Portfolio Evaluation Results J - 1  Table J-1 Water Forward 2024 Objectives and Performance Measures Objective Sub-Objective Performance Measure Data Source Objective Weight Sub- Objective Weight Water Supply Benefits Maximize reliability and resiliency, minimize vulnerability Water Availability Modeling results Maximize portfolio diversity Portfolio diversity score Economic Benefits Maximize cost-effectiveness Cost (lifecycle, capital, operations and maintenance) Strategy Characterization 20% 20% Equity Benefits Equity and affordability score Maximize positive benefits and minimize negative impacts for marginalized communities Equity & Affordability Tool 8% 8% Water Availability Modeling Portfolio Characterization Water Availability Modeling Strategy Characterization Portfolio Characterization 40% 20% Minimize ecosystem impacts Net return flows Minimize net energy use Operational energy use Environmental Benefits Maximize water use efficiency Potable GPCD 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 12% 3.5% Maximize local control/local resource Volume of local and AW-controlled water resources Portfolio Characterization 35% 5% 4% 6% 6% 4% 3.5% 5% J - 2  Table J-2 Water Forward 2024 Objective Descriptions 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 Maximize positive benefits and minimize negative impacts for marginalized communities Maximize positive benefits and minimize negative impacts 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 J - 3  Table J-3 Water Forward 2024 Performance Measure Descriptions Performance Measure Performance Measure Description Water Availability Modeling results Arithmetic average of the reliability, vulnerability, and resiliency score of a portfolio for all hydrologies in all planning horizons. Portfolio diversity score 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 Volume of local and AW-controlled water resources 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. Percent of 2080 portfolio max annual yield made up of local and AW-controlled water resources. J - 4  Table J-4 Water Forward 2024 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? 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? 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 Accountability • Transparency • Accessibility • Community outreach and education Affordability and Economic Impacts • Rate impacts • Growth and development • Workforce development J - 5  s e i l p p u S e b a t o P l Table J-5 Water Forward 2024 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 Utility-Side Water Loss Control Customer-Side Water Use Management Native & Efficient Landscaping Centralized Reclaimed - r e s n o C n o i t a v - n o N l e b a t o P e 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 17,500 10,000 9,600 9,600 18,300 18,300 18,300 5,000 22,400 25,000 40,000 22,400 22,400 10,000 20,000 20,000 20,000 J - 6 Table J-6 Water Forward 2024 Raw Portfolio Evaluation Results 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% 99 99 99 99 99 99 99 99 99 99 1.16 $2,832 1.05 $2,422 1.06 $2,260 1.48 $2,817 1.43 $2,417 1.54 $2,421 1.48 $2,629 1.49 $2,761 1.50 $2,734 1.45 $2,858 3.3 3.24 3.24 3.26 3.17 3.21 3.16 3.2 3.13 3.12 110,143 110,157 125,694 106,319 124,916 120,405 122,140 94,077 102,622 42,772 1,302,540 1,622,708 9,600,295 5,467,892 11,421,084 16,288,257 16,835,033 16,846,851 25,787,327 34,237,945 3.11 3.98 3.76 2.88 3.77 4.02 2.91 3.54 3.95 2.66 3.77 3.69 2.78 3.51 3.98 2.52 3.47 3.85 2.47 3.15 3.68 2.51 3.13 3.51 2.43 2.95 3.68 2.34 2.81 3.63 100% 100% 100% 100% 100% 100% 100% 89% 93% 91% Reliability, Resiliency, & Vulnerability Score (%) 2080 Potable Gallons per Capita per Day Portfolio Diversity (ENS) Cost ($/AF/yr) Equity and Affordability (Qual.) Net Return Flows (AF/yr) Operational Energy Use (M-kW-hrs) Water Quality Impacts (Qual.) Implementation and Operational Risk (Qual.) System Resiliency Benefits (Qual.) Volume of local and AW- controlled water resources (%) J - 7