Reservoir Development Update Region K Meeting July 11, 2012 Karen Bondy, P.E. Manager of Resource...
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Transcript of Reservoir Development Update Region K Meeting July 11, 2012 Karen Bondy, P.E. Manager of Resource...
ReservoirDevelopment Update
Region K MeetingJuly 11, 2012
Karen Bondy, P.E.Manager of Resource Strategy
1
New Water Supply Goal
• 100,000 ac-ft/yr by 2017• Reduce interruptible demands on Highland
Lakes
• Improve agricultural water reliability
• Improve agricultural water efficiency
• Reduce risk of firm water curtailment
2
Development Strategy• 3 Critical Drivers
100,000 ac-ft/yrIn 5 yearsNo rate increase
• Effect on Development StrategyMaximize use of existing assetsMinimize construction of new facilitiesMinimize environmental and water rights
permitting
3
4
LCRA’s Current Water Sources
Total Conservation Capacity- 2.1 MafyMaximum Interruptible Water Supply- 1.5 Mafy
Existing LCRA Assets• Lower basin senior water rights• Irrigation division pump stations* and
canals• Baylor Creek land and storage rights• Excess flows water right (5731)• Pierce Ranch land option• Lake Bastrop land and groundwater
* May require substantial repairs/upgrades 5
Fayette Power Project — 38,101 AFY
Lakeside
Gulf Coast
Garwood
PierceRanch
Austin
Colorado River
Underground Services Markham12,327 AFY
Oxea3,222 AFYSTP
40,000 AFYRiver Pump StationFirm Customer(AFY = Acre-feet per year)
Environmental FlowCommitment (2010 WMP)33,440 AFY
Lower Basin MapLake Bastrop
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 20100.0
0.5
1.0
1.5
2.0
2.5
3.0
Total Combined Storage in Lakes Buchanan and Travis
Full Storage (2.01 MAF)
Average (1.67 MAF)
Combined Storage (MAF)
Sep 30, 1940 to Jan 28, 2011
Mill
ions
of A
cre-
feet
1957 FLOOD
1952 FLOOD
1991 FLOOD
1997 FLOOD
2002 FLOOD
2007 FLOOD
Sept. 1952
31% Full
Sept. 1964
32% Full
Oct. 1984
41% Full
Sept. 2009
39% Full
Water Availability Results • 100,000 ac-ft/yr available in lower basin• Requires diverting and storing to “firm up”• Adequate pumping capacity at Lakeside,
Garwood and Gulf Coast• ~70,000 ac-ft of storage required• New reservoirs can meet 100,000 ac-ft/yr
goal
8
Two Potential Configurations• Reservoirs in irrigation divisions only
2 to 4 reservoirsUtilize existing pumps and canalsRequires construction of reservoirs and outlet
facilities
• Baylor Creek plus irrigation divisionsRequires reservoirs and new pump station, pumps
and piping for Baylor Creek reservoirAlso requires water supply (water rights) for Baylor
Creek diversion9
STP Pump Station
10
Water Rights SummaryPermit Terms Baylor
Creek Lakeside Garwood Gulf Coast
Excess Flows(5731)
Muni, Ag and Industrial Use
Use Outside Division
Storage
Bed and Banks Transport
Available Water Supply
**
11
Permit Amendment Needed
Permit Terms Already in Place
**Need to amend downstream water right to add point of diversion at Baylor Creek
Next Steps• Optimize irrigation division reservoir size/location
• Develop construction requirements, capital and operating cost estimates for all options
• Determine if groundwater is cheaper alternative
• Develop water rights and environmental permitting strategies
• Prepare project recommendation for Board by end of year
12
Recap• Only source of water for new reservoirs is
LCRA’s lower basin water rightsWill require permit amendments
• Reservoirs can meet 100,000 ac-ft/yr goalGroundwater might be cheaper alternative
• Construction requirements:All options need reservoir and outlet facilitiesBaylor Creek also needs water supply, pump
station and piping to plant (~ 4 miles)13
14
Questions&
Discussion