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Facing the Challenge of Water Supply Shortages

Facing the Challenge of Water Supply Shortages. Where We Are and How We Got Here. Two Distinct Issues. Unserved areas Areas outstripping their supply. Ballpark Estimate. In 2005, $50,000 to $15,000 per mile of water line Plus operating costs. Costs to Serve Rural Areas.

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Facing the Challenge of Water Supply Shortages

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  1. Facing the Challenge of Water Supply Shortages Where We Are and How We Got Here TACIR

  2. Two Distinct Issues • Unserved areas • Areas outstripping their supply TACIR

  3. Ballpark Estimate In 2005, $50,000 to $15,000 per mile of water line Plus operating costs. TACIR

  4. Costs to Serve Rural Areas • Reading meters—vehicle costs and staff time • Operating and maintaining pumps and tanks—staff, electricity, depreciation • Flushing lines to ensure drinking-water quality All are more costly in sparsely populated areas. And there are fewer people to pay for them. Grants help with intial costs, but not operating costs. TACIR

  5. Line Flushing Costly but necessary Serving freshly treated water “just in time”is impossible TACIR

  6. Ways to Reduce Costs • Automated meter reading reduces staff time in the field; vehicle idling, stops and starts • Automatic line flushing saves staff field time and water • Remote monitoring of tanks, pumps and valves saves time, water and money But it’s still more expensive in sparsely populated areas. TACIR

  7. Water is not an unlimited resource . . . • Carrying capacity—the maximum population that can survive indefinitely in a given environment • Limiting factor—anything that tends to make it more difficult for a species to live and grow or reproduce in its environment TACIR

  8. Today’slimitsmaynotbe limitstomorrow! TACIR

  9. Getting water where you need it Source: U.S. Army Corps of Engineers, Nashville District

  10. . . . Water is a shared resource Source: U.S. Army Corps of Engineers, Nashville District TACIR

  11. Current Water Supply Allocations in the Cumberland River System Source: U.S. Army Corps of Engineers, Nashville District TACIR

  12. Average Flow Contribution by ProjectPercent of Total Flow TACIR

  13. Old Hickory Lake • Main stem lock and dam project • Authorized purposes • Navigation • Flood control • Power production • Water supply intake permits • No water supply allocations—same as all main stem projects • Water supply use may exceed lake inflows • Moratorium to study TACIR

  14. Federal Water Supply ActReallocation • Authorizes reallocation of storage from original purposed to water supply • Typical reallocation is from power production • Can be from flood control, but more hurdles • Water utilities must pay for storage, the higher of • Benefits or revenues foregone, • Replacement cost, or • Updated cost of storage. TACIR

  15. If we build it, they will come . . . Source: National Drought Mitigation Center, School of Natural Resources, University of Nebraska-Lincoln. TACIR

  16. J. Percy Priest Lake • Tributary reservoir • Authorized purposes • Flood control • Power production • Recreation • Added purpose—water supply • Reallocated from power production pool in 2005 • Further reallocations requested in 2009 • Preliminary report estimates much lower reliable capacity • Final report submitted for approval in January 2012 • Approval may require several months TACIR

  17. Other areas of concern • Mississippi lawsuit against Memphis and Tennessee • Georgia attempts to tap Tennessee River or its tributaries TACIR

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