where we are and how we got here tacir. two distinct issues unserved areas areas outstripping their...
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Facing the Challenge of Water Supply Shortages
Where We Are and How We Got Here
TACIR
Two Distinct IssuesUnserved areasAreas outstripping their supply
TACIR
Ballpark EstimateIn 2005,
$50,000to
$150,000per mileofwater linePlus operating costs.
TACIR
Costs to Serve Rural AreasReading meters—vehicle costs and staff timeOperating and maintaining pumps and tanks
—staff, electricity, depreciationFlushing 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.
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TACIR
Line FlushingCostly but necessary
Serving freshly treated water “just in time”is impossible
Ways to Reduce CostsAutomated meter reading reduces staff time
in the field; vehicle idling, stops and startsAutomatic line flushing saves staff field time
and waterRemote monitoring of tanks, pumps and
valves saves time, water and money
But it’s still more expensive in sparsely populated areas.
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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
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Today’slimitsmaynotbelimitstomorrow!
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Getting water where you need it
Source: U.S. Army Corps of Engineers, Nashville District
. . . Water is a shared resource
TACIRSource: U.S. Army Corps of Engineers, Nashville District
Current Water Supply Allocations in the Cumberland River System
Project Utility
J. Percy Priest
LaVergne, TNMurfreesboro, TNSmyrna, TNYMCA, TNConsolidated Utility District, TNCedar Crest Golf Course, TN
Center Hill
Cookeville, TNSmithville, TNDeKalb Utility District, TNRiverwatch Resort, LLC., TN
Dale HollowByrdstown, TNTrooper Island Camp, KYDale Hollow St. Park, KY
LaurelBarbourville, KYLondon, KYLaurel County WD #2, KY
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Source: U.S. Army Corps of Engineers, Nashville District
Average Flow Contribution by ProjectPercent of Total Flow
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Old Hickory LakeMain stem lock and dam project
Authorized purposes Navigation Flood control Power production
Water supply intake permitsNo water supply allocations—same as all main
stem projectsWater supply use may exceed lake inflowsMoratorium to study
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Federal Water Supply ActReallocationAuthorizes reallocation of storage from
original purposes to water supplyTypical reallocation is from power productionCan be from flood control, but more hurdlesWater utilities must pay for storage, the
higher ofBenefits or revenues foregone,Replacement cost, orUpdated cost of storage.
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If we build it, they will come . . .
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Source: National Drought Mitigation Center, School of Natural Resources, University of Nebraska-Lincoln.
J. Percy Priest LakeTributary 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
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Other areas of concernMississippi lawsuit against Memphis and
TennesseeGeorgia attempts to tap Tennessee River or
its tributaries
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