Backup — original pdf

Backup

Water Forward 2024 initial list of water management strategies January 9, 2024 WATER FORWARD: PLANNING FOR UNCERTAINTY Range of demands Possible climate futures Droughts Worse than the Drought of Record Regional supply trends Develop a range of future conditions Find common near-term strategies that work for a broad range of futures Develop adaptive plan with key decision points Re-evaluate at key decision points Water Forward 2024 Decision points Uncertainty in future water availability A C D B E 2120 WF24 scenario planning methodology overview 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 WMS Use optimization model to identify top-performing WMSs over all scenarios Construct 50-yr portfolios for further evaluation 50-Year portfolio trade-off analysis Conduct vulnerability assessment to identify system stressors Preferred 50-yr portfolio & equity and affordability analysis Adaptive Management Plan (AMP) Outcome Updated WF18 strategies and range of baseline needs WMSs variables and rules for testing Evaluated 50-year portfolios and identified system stressors Water Forward 2024 Plan Timeline 2022 Fall 2024 2024 Water Forward Plan - Strategy Characterization  Review strategies considered and/or recommended in Water Forward (WF)18  Review progress of ongoing programs  Identify additional strategies for WF24 initial list  Screen through feasibility filter (proven technology, sufficient data, etc.)  Identify any variables (operational, scale)  Update characterization 2024 Water Forward Plan - Strategy Types  Water Management Strategy (WMS) Characterization Update • Supply Strategies • Emergency Water Supplies • Demand Management Strategies • Best Management Practices Supply Strategies Photo credit: https://www.austintexas.org/?asset=1570-ig-18008312938866305 Initial List of Supply Strategies  Storage Strategies • Aquifer Storage and Recovery (ASR) • New Off Channel Reservoir with Lake Evaporation Suppression • Off-channel reservoir supplied by Colorado River or reclaimed water (Decker Lake)  Water rights and water supply contracts • Additional Supply from Lower Colorado River Authority (LCRA) • Regional Partnership with Corpus Christi  Potable Reuse Strategies  New water supplies • • Indirect Potable Reuse through Lady Bird Lake and Capture Local Inflows to Lady Bird Lake Indirect Potable Reuse - Through Alluvial Aquifer or Bed and Banks • Direct Potable Reuse from Wastewater Treatment Plant • Seawater Desalination • Conventional groundwater • Brackish Groundwater Desalination • Interbasin Transfers Storage Strategies Strategy Origin Status Aquifer Storage and Recovery; Aquifer storage of drinking water for use during low surface water supply Strategy included in Council-approved WF 2018 Plan New Off Channel Reservoir with Lake Evaporation Suppression; Construction of an off-channel reservoir supplied by the Colorado River, managed by Austin Water, and using a surface film to minimize summer evaporation Strategy included in Council-approved WF 2018 Plan Off-channel reservoir supplied by Colorado River or reclaimed water (Decker Lake); would include use of a limited operating range Strategy considered but not included in Council- approved WF 2018 Plan N/A Implementation underway • • Preliminary engineering (Phase 1a) to be complete March 2024 Implementation not started yet Potable Reuse Strategies Strategy Origin Status Indirect Potable Reuse through Lady Bird Lake and Capture Local Inflows; In drought emergencies, wastewater effluent is diverted to Lady Bird Lake and subsequently treated at Ullrich Plant to supplement potable water supply. Infrastructure could regularly capture seasonal flows to the Lake Strategy included in Council-approved WF 2018 Plan Implementation planning underway Indirect Potable Reuse through Indirect Potable Reuse through either a groundwater infiltration or bed and banks Strategy considered but not included in Council- approved WF 2018 Plan Direct Potable Reuse from Wastewater Treatment Plant; Purify highly treated reclaimed water using advanced treatment (similar to desalination treatment) to supplement drinking water supply Strategy considered but not included in Council- approved WF 2018 Plan N/A N/A Water Rights and Water Supply Contracts Strategy Origin Additional Supply from Lower Colorado River Authority (LCRA); Secure additional supply from LCRA through a new or amended contract Strategy considered but not included in Council- approved WF 2018 Plan Status N/A Regional Partnership with Corpus Christi; Participate in cost-sharing for a new seawater desalination plant in exchange for a portion of Corpus Christi's Colorado River water right Strategy considered but not included in Council- approved WF 2018 Plan N/A New Water Supplies Strategy Seawater Desalination; Source water from the Gulf of Mexico for treatment at a desalination plant, removing dissolved solids via high-pressure membrane filtration. Implement through a regional partnership. Origin Strategy considered but not included in Council-approved WF 2018 Plan Status N/A Conventional groundwater; Import water through acquiring groundwater permits & develop source, treatment, and disposal infrastructure Strategy considered but not included in Council-approved WF 2018 Plan N/A Brackish Groundwater Desalination; Withdrawal and desalination of brackish (salty) groundwater to supplement drinking water supply Interbasin Transfers; Importation of surface water supplies from outside of the Colorado River basin Strategy included in Council- approved WF 2018 Plan Implementation not started yet Strategy considered but not included in Council-approved WF 2018 Plan N/A Summary of Supply Strategies Ranges: <$500 - $, < $1,000 - $$, <$5,000 - $$$, >$5,000 - $$$$, <1,000 - Demand Management Strategies Photo credit: https://www.floresartscape.com/our-services/ca-friendly-landscapes Initial List of Demand Management Strategies  Utility-Side Water Loss Control  Outdoor Water Use Reduction • Water Efficient and Native Landscapes • Irrigation Efficiency Code Change  Non-potable Reuse • Onsite Reuse • Centralized Reclaimed • Decentralized Reclaimed • Community-scale Sewer Mining • Community-scale Stormwater Harvesting • Community-scale Rainwater Harvesting  Customer Side Water Use Management • Customer Side Data-Driven Water Use Management • Water Use Estimates/Benchmarking - Seller Disclosure Swimming Pools • Commercial, Industrial, and Industrial (CII) - • Commercial, Industrial, and Industrial (CII) - Steam Boilers and Cooling Towers Utility-Side Water Loss Control Origin Status Strategy included in Council- approved WF 2018 Plan Implementation underway Strategy Utility-Side Water Loss Control; Enhancement to current program for further water loss reduction. Components include: • Production meter program (validation and calibration programs) • Customer meter program • Large customer meter accuracy and as- needed replacement • MyATX Water (Advanced Metering Infrastructure) data analysis • Leak Detection program enhancements • Renewing Austin (pipeline replacement) Outdoor Water Use Reduction Strategy Water Efficient and Native Landscapes; Requirements and incentives for irrigation systems and landscapes in new single- family homes to reduce outdoor irrigation demand. Components include: • • • Irrigation and Landscape Ordinance for new single family residential developments Landscape Transformation Incentive Irrigation Efficiency Incentives Irrigation Efficiency Code Change; Proposed code changes: From: Requirement of installation of a permanent irrigation system To: allows for installation of a temporary irrigation system to establish permanent landscaping Origin Strategy included in Council-approved WF 2018 Plan Status Implementation underway Strategy considered but not included in Council- approved WF 2018 Plan N/A New Ordinance on Landscape Transformation Activities Non-Potable Reuse Strategies (1/2) Strategy Onsite Reuse; Codes/incentives to require or encourage lot-scale, non-potable reuse for indoor and outdoor uses. Sources include rainwater, stormwater, Air Conditional (AC) condensate, graywater, or black water. Components include March 2024 ordinance requiring rainwater and AC condensate reuse, future phases of onsite reuse implementation, and incentives. Centralized Reclaimed; Centralized reclaimed water system will expand to meet growing non-potable demands including irrigation, cooling, manufacturing, and toilet flushing from the city’s two largest centralized wastewater treatment plants (South Austin Regional and Walnut Creek). Components include ordinance required connections and incentives Origin Strategy included in Council-approved WF 2018 Plan Status Implementation underway Strategy included in Council-approved WF 2018 Plan Implementation underway Non-Potable Reuse Strategies (2/2) Strategy Decentralized Reclaimed; Decentralized facilities in new developments collect and treat wastewater effluent for community-scale reuse. Components include ordinance required connections and incentives. Origin Strategy included in Council-approved WF 2018 Plan Status Implementation underway Community-Scale Sewer Mining; Extraction and treatment of wastewater from sewers for reuse through a separate community-scale reclaimed water distribution system Strategy included in Council-approved WF 2018 Plan Community-scale Stormwater Harvesting; Stormwater capture, treatment, and distribution for non-potable use at a neighborhood-scale Strategy included in Council-approved WF 2018 Plan Implementation underway Implementation not started yet Community-scale Rainwater Harvesting; Rainwater capture, treatment, and distribution for non-potable use at a neighborhood-scale Strategy considered but not included in Council- approved WF 2018 Plan N/A Onsite Water Sources in Buildings Increasing level of contaminants AC condensate Increasing cost of treatment Rainwater Stormwater Graywater Blackwater Customer Side Data-Driven Water Use Management Strategy Customer Side Data-Driven Water Use Management; Leveraging AMI and benchmarking data with water budgeting tools to reduce customer water use. Water Use Estimates/Benchmarking - Seller Disclosure; Sellers of commercial property must disclose non-compliant water equipment or fixtures to buyers and City staff in writing at the sale point. Origin Status Strategy included in Council-approved WF 2018 Plan Implementation underway Strategy considered but not included in Council-approved WF 2018 Plan N/A Commercial, Industrial, and Industrial (CII) - Swimming Pools; Swimming pool retrofit requirement Strategy considered but not included in Council-approved WF 2018 Plan N/A Commercial, Industrial, and Industrial (CII) - Steam Boilers and Cooling Towers; Mandates existing/new cooling towers to comply with efficiency standards set since 2008. Strategy included in Council-approved WF 2018 Plan Implementation Completed Summary of Demand Strategies Ranges: <$500 - $, < $1,000 - $$, <$5,000 - $$$, >$5,000 - $$$$, <1,000 - Existing Water Resource Portfolio Strategies  Colorado River and Highland Lakes Supply  Drought Contingency Plan  Austin Water Conservation Programs  Centralized Reclaimed Water System Best Management Practices  Protect Austin's Core Colorado River Supplies  Lake Austin Operations (Lake Level Variations)  Steam Electric Water Rights Amendments  Water-efficient Fixtures Summary of Feedback Received on Potential Additional Strategies For Screening  Commercial non-functional turf irrigation ban (exceptions for sports fields, parks and non-potable irrigation)  Turf buyback  Toilet rebates  Pool water use reduction program  Single family home greywater systems, greyter/hydroloop • Incentive/permitting pathway  Expanded/improved enforcement  Expanded/improved educational programs  Encourage single family properties to connect to reclaimed system  Water efficiency do-it-yourself (DIY) audit for homeowners  Minor plumbing repair program for low income customers Next Steps for screening  Incorporate additional feedback on potential strategies into the initial list o Feasibility screening for each strategy o Up to 14 demand management and 14 supply strategies will be characterized  Update cost and yield estimates by reassessing 2018 plan assumptions and updated data o Establish ranges for costs and yields o Categorized by decadal planning horizon  Strategy characterization information to be used as input in WMS Assessment and Vulnerability Evaluation (WAVE) Model Schedule Questions?