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Decentralization = New Supply?

Decentralization = New Supply?. The North Bay Watershed Association’s Satellite Treatment Plant Study. The Satellite Treatment Plant Study develops a framework for evaluating the feasibility of decentralized Water Recycling Systems.

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Decentralization = New Supply?

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  1. Decentralization = New Supply? The North Bay Watershed Association’s Satellite Treatment Plant Study

  2. The Satellite Treatment Plant Study develops a framework for evaluating the feasibility of decentralized Water Recycling Systems That Framework is then applied to case studies in Marin, Sonoma and Napa Counties

  3. General Criteria that can be translated Attention to Energy Efficiency Reliable New Water Supply Wastewater Benefits from Reduced Mass Loading Innovative Solution for a Tough Market The Study is a Cooperative Effort between DWR & NBWA

  4. The General Criteria Outlined a number of basic Analysis Techniques • Decision Criteria • Market Analysis Techniques • Influent Flow Considerations • Process & Distribution Overview • Cost Calculator • Economic Evaluation Techniques

  5. Decision Criteria Balances Costs of new Supply and Benefits of Recycling Expand Raw Potable Reduced Wastewater Discharge & Mass Loading Need for New Water Supply Centralized Recycling Satellite Recycling Desalination

  6. Considerations for The Initial Screening Analysis are Outlined • Quantifying Water Use • Available Records or Assumptions Based on Land Use • Quantifying Wastewater Flow • Available Records or Assumptions Based on Land Use • Available Mapping • GIS is a great tool • Point of View of the “Client” • Water Agency; Wastewater Agency; Full-Service City • Operational Realities • Satellite Plants required Wastewater Operators

  7. Conceptual Facility is the Basis of Cost Estimates

  8. The General Criteria includes a “Cost Calculator”

  9. Calculator “output” facilitates Economic Analysis

  10. The Site Specific Analysis Applies the General Criteria • Central Marin Service Area – 6 sites • North Marin Service Area – 2 sites • Sonoma Valley Service Area – 2 sites • Napa Service Area – 2 sites

  11. Types of Conclusions We Expected General Rule of Thumb…. Satellites become cost effective at distances greater than 4 miles from the Central Plant

  12. The Site Specific Analysis can also be described as “reality sets in”

  13. Central Marin Challenges • Coordination with thirteen distinct sanitation agencies • A relatively wet climate damps irrigation demand • A strong conservation ethic results in “frugal” landscaping • A mature residential community without many “anchor tenants”

  14. Central Marin Analysis

  15. Central Marin Analysis

  16. Central Marin Conclusions 1. Satellites Can be Cost Effective!!

  17. Central Marin Conclusions 2. But Not at Cost Effective as the Next Increment of Potable Water

  18. Central Marin Conclusions 3. Outside Contributions Can tip the Balance!!

  19. Decentralized Recycled Water • Presents a new frame for reviewing feasibility • Can provide a potential new supply in urban areas

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