PRMRWSA Source Water Feasibility Study

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PRMRWSA Source Water Feasibility Study

• October 15, 2008

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History

• 2005 Water Planning Alliance PRMRWSA
  identified future supply opportunities
• 2006 Authority Regional Water Supply Master
  Plan evaluates 6 high potential supply
  opportunities
• 2007 Authority Board approves feasibility
  study on 3 source areas
• 2008 Completion of Source Water Feasibility
  Study

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Feasibility Study

• Major Opportunities
• Surface Water
• Groundwater
• Resource Evaluation
• Flow / Quality / Timing
• Existing Users
• Land Use
• Project Development
• Reservoirs Intakes
• Treatment Requirements
• Connections
• Cost Screening
• Environmental Benefits
• Program Development
• Meet Future Needs
• Project Combinations Comparisons

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Reservoir Site Selection

• Multi-Step Reservoir Site Process
• Considered
• Environmental Criteria
• Flood Maps
• Number of Property Owners and Land Use
• Geo-Hazards, etc.
• ID Potential Sites
• 11 Sites in Shell/Prairie
• 8 Sites in Upper Myakka
• Site Evaluations
• 3 Sites Shell / Prairie
• 3 Sites Upper Myakka
• 2 Sites Dona Bay

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Upper Myakka / Flatford

• 3 Reservoir Sites
• 1000 acre sites
• 6 Billion Gallons
• 2 Intake Sites
• Yield 10 20 mgd
• Environmental benefit by reducing water in swamp

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Groundwater Permits

• Mostly Agricultural Use
• 120 MGD Permitted Groundwater Use
• Brackish GW Resource
• Regulatory Considerations
• Concentrate disposal issues

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Shell/Prairie Creek

• 3 Reservoir Sites
• 1000 acre sites
• 6 billion gallons
• 2 Intake Sites
• Yield 12 20 mgd
• Environmental benefit reduce low-flow
  withdrawals

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Groundwater Permits

• Mostly Agricultural Use
• 100 MGD Permitted Groundwater Use
• Significant Brackish GW Resource
• Concentrate disposal issues

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Dona Bay / Cow Pen Slough

• 2 Reservoir Sites
• 550 acres
• 1000 acres
• 4-10 bg
• 1 Intake Sites
• Yield 7 20 mgd
• Environmental benefit reduce fresh water to
  Dona Bay

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Groundwater Permits

• Mostly Public Supply Use
• Brackish Groundwater
• No Permit Inventory Conducted
• Expansion of Existing GW Facilities

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Study-Wide Findings

• Large Surface Water Resource Available
• Storage Required
• Environmental Benefits
• Conjunctive groundwater development improves
  reliability and reduces reservoir size
• Groundwater sources can be almost anywhere in the
  regional system
• Membrane treatment required for all sources

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Next Steps

• Complete Technical Analysis
• Develop Projects
• Board Workshop on November 5
• Board Meeting December 3
• Preliminary Design
• Final Design
• Construction

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