Solving the Puzzle of Local W Solving the Puzzle of Local Water - - PowerPoint PPT Presentation

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Solving the Puzzle of Local W Solving the Puzzle of Local Water - - PowerPoint PPT Presentation

Aug 06, 2023 378 likes •645 views

Solving the Puzzle of Local W Solving the Puzzle of Local Water ater Supply in Los Angeles Supply in Los Angeles UCLA UCLA: Erik Porse PhD, Kathryn Mika PhD, Kartiki Naik PhD, Madelyn Glickfeld, Mark Gold D.Env, Stephanie Pincetl PhD

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Solving the Puzzle of Local W Solving the Puzzle of Local Water ater Supply in Los Angeles Supply in Los Angeles

UCLA UCLA: Erik Porse PhD, Kathryn Mika PhD, Kartiki Naik PhD, Madelyn Glickfeld, Mark Gold D.Env, Stephanie Pincetl PhD Colorado School of Mines Colorado School of Mines: Kimberly Manago, PhD, Terri Hogue, PhD University of Utah University of Utah: Elizaveta Litvak PhD, Diane Pataki PhD

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The Urban W The Urban Water System of L.A. ater System of L.A.

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200+ private and public retailers 5 Municipal Water Districts 3 Water Import Agencies, 1 Replenishment District 7 Watermasters in 15 “adjudicated” groundwater areas 300+ groundwater rights holders 10 Un-adjudicated Basins & sub-basins 84 stormwater management agencies 5+ agencies for treating wastewater 1 Flood Control District 4+ Federal agencies

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Water Retailers in Los Angeles ater Retailers in Los Angeles

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3 3 3 3 3 3

Pincetl Pincetl et al (2016). Fragmented Flows: W et al (2016). Fragmented Flows: Water Supply ater Supply in Los Angeles County in Los Angeles County. . Envir Environmental Management.

  • nmental Management. 58.2

58.2

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Gr Groundwater

  • undwater

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Evolving Gr Evolving Groundwater Rights in LA

  • undwater Rights in LA

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  • Well-studied basins in Southern California
  • Elinor Ostrom, Bill Blomquist
  • New: Evolving groundwater rights over time
  • Becoming more consolidated, publicly-controlled

Porse Porse et al (2016). Pumping for the Masses: Evolution of Gr et al (2016). Pumping for the Masses: Evolution of Groundwater Management in Los Angeles.

  • undwater Management in Los Angeles. Geojournal
  • Geojournal. 81.5

81.5

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Pumping Rights: Mor Pumping Rights: More Consolidated & Public e Consolidated & Public

West Coast Basin est Coast Basin

6 10,000 20,000 30,000 40,000 Private Public Publicly-Regulated Non-Profit Adjudicated Rights (ac-ft) 10,000 20,000 30,000 40,000 Private Public Publicly-Regulated Non-Profit Extraction Rights (ac-ft)

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Assembling the Pieces for Assembling the Pieces for Local W Local Water Supply in LA ater Supply in LA

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Changing a System Changing a System

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Water Agencies Atmosphere Infrastructure Landscapes Aquifers

Imported Imported Water ater

Evaportranspiration Evaportranspiration Pr Precipitation ecipitation

Direct Use Managed Managed Rechar Recharge ge Pumping Pumping Natural Natural Rechar Recharge ge Direct Use

Dischar Discharges & ges & Outflows Outflows (to Ocean) (to Ocean)

Reuse Reuse

Curr Current L.A. W ent L.A. Water Flows ater Flows

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Changing a System Changing a System

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Water Agencies Atmosphere Infrastructure Landscapes Aquifers

Imported Imported Water ater

Evaportranspiration Evaportranspiration Pr Precipitation ecipitation

Direct Use Pumping Pumping Rechar Recharge ge Direct Use

Dischar Discharges & ges & Outflows Outflows (to Ocean) (to Ocean)

Reuse Reuse

Futur Future L.A. W e L.A. Water Flows ater Flows With Mor ith More Local Use e Local Use

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Which Los Angeles? Which Los Angeles?

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Goals of a Systems Model Goals of a Systems Model

Assess local water supply potential given current & future (planned) systems Develop a Flexible and Adaptable model that can evolve Limit assumptions

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Mapping Layers of Mapping Layers of Water in L.A. ater in L.A.

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Artes Artes: A Network Model for L.A. County W : A Network Model for L.A. County Water ater

  • Integrated network
  • Water Suppliers (103)
  • Treatment System (17)
  • Surface water zones (46+)
  • Groundwater basins (13)
  • Reservoirs and aqueducts (26)
  • Spreading basins (26)
  • Database | Python | Gurobi

13 The L.A. W The L.A. Water Network Modeled in ater Network Modeled in Artes Artes Porse Porse et al (2017). Systems Analysis and Optimization of Local W et al (2017). Systems Analysis and Optimization of Local Water Supplies in Los Angeles. ater Supplies in Los Angeles. Journal of W Journal of Water Resour ater Resources Planning and Management. ces Planning and Management. 143(9) 143(9)

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Pr Procedur

  • cedure and Softwar

e and Software e

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Results Results

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Results: V Results: Visualizing Scenarios isualizing Scenarios

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Tradeoffs in water supply, demands, shortages

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Results: Supply Portfolios Results: Supply Portfolios

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Quantifying tradeoffs

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Results: Acr Results: Across Retailers

  • ss Retailers

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Uneven vulnerability

Scenario: 80% of demands and 20% of imported water supplies

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Sustainability Planning Sustainability Planning Scenario Scenario

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  • What would a water-efficient city look like?
  • Indoor: 50 gallons per capita per day (gpcd)
  • Outdoor: Tree canopy water needs, climate and ecosystem

appropriate landscapes

  • Commercial and Industrial (historic)
  • Aggressive conservation scenario, but not maximum
  • Can cut imports by 30-40% with minimal shortages and low

risk of groundwater overdraft using current infrastructure

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Getting to Local W Getting to Local Water Supply in LA ater Supply in LA

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  • What would it take?
  • Implement currently planned reuse and stormwater

capture projects

  • Conversion of landscapes and tree canopy to low-water

species (~84 gpcd)

  • Only importing water during wet years (top 25%)

Our analysis indicates that these efforts would create a sustainable water supply portfolio for LA County

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Conclusions Conclusions

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LA County can significantly reduce water imports 30% imported water reductions with current system 50-75% possible with currently planned upgrades

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A V A Vision for LA W ision for LA Water Management ater Management

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Thinking across many goals

Smart solutions would: Increase reliability & local reliance Be cost-effective Reduce energy intensity Improve water quality

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A V A Vision for LA W ision for LA Water Management ater Management

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Build Dynamic Tools & Places for Collaboration

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A V A Vision for LA W ision for LA Water Management ater Management

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  • Getting there:
  • Participatory planning
  • Address key data gaps
  • Surface-to-groundwater interactions
  • Leak and loss data
  • Urban Heat Island effects
  • Institutionalize the tools
  • Data collection
  • Modeling for planning and evaluation
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Links Links

LA Water Hub http://waterhub.ucla.edu Source Code and Data https://erikporse.github.io/artes/ Contacts diane.pataki@utah.edu eporse@ioes.ucla.edu spincetl@ioes.ucla.edu thogue@mines.edu

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Thanks to: Thanks to: