Download - Los Angeles Department of Water and Power Seawater Desalination Update by: Alvin Bautista, P.E
Los Angeles Department of Water and Power
Seawater Desalination Updateby: Alvin Bautista, P.E.
October 2007
• MWD has included desalination in its Integrated Resources Plan - $250/AF incentive offered
• LADWP began evaluations in 2002 (Fatal Flaw Analysis, Optimization Study, Brine Discharge Analysis, incl. use of Hyperion outfall)
• Due diligence requires a site-specific evaluation through detailed pilot testing at the Scattergood site
• Water System is conducting a small-scale pilot project at Scattergood to evaluate various parameters
Seawater Desalination Update
• Pilot project focus is on data and information collection (to provide answers that can serve as basis for future decisions)
• Grant funding from the Bureau of Reclamation and Department of Water Resources (Proposition 50) acquired to fund approx. 50% of the pilot project’s costs
• Pilot will be conducted in a manner that will not solely depend on power plant remaining in service
Seawater Desalination Update
LADWP Proposed Desalination Project Site
• 85% of Los Angeles’ water supply is imported
• 40% of Los Angeles Aqueduct water has been redirected for environmental restoration
• City population expected to increase by 370,000 to over 4.3 million residents by 2025
• Continuous efforts in recycled water supply development
• LADWP success in water conservation has kept demands low and imported supplies sustainable
Seawater Desalination and City of Los Angeles’ Water Resources
Seawater Desalination and City of Los Angeles’ Water Resources
Local Wells11%
Conservation18%
MWDWater
Purchases36%
Recycled Water
1%
Los Angeles Aqueduct
34%
Los Angeles Aqueducts
36%
MWD23% - 40%
Existing/Planned Recycled Water
4%
Other Planned Supplies
7%
PotentialLocal Resource
Development10%Local Wells
13%
Potential Additional
Conservation7%
• 85 percent of Los Angeles’ water supply is imported
FY 06-07
2030
Seawater Desalination and City of Los Angeles’ Water Resources
• 40% of Los Angeles Aqueduct water has been committed for environmental restoration
DECLINING LOS ANGELES AQUEDUCT
DELIVERIES
375,000
260,000
85,000
16,000
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
500,000
Before
Acr
e-F
eet
Mono Basin
Owens Valley
Today
184,000 AF reduction =40% of historic supply
0
100
200
300
400
500
600
700
800
900
1000
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06
Fiscal Year
Ac
re-F
ee
t x
1,0
00
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Po
pu
lati
on
x 1
,00
0,0
00
Actual WaterDemandPopulation
CONSERVATION’S IMPACT ON CITY OF LOS ANGELES WATER
USEWater use is the same today as it was 25 years ago despite an increase in population of nearly 1 million people.
Seawater DesalinationOpportunities
• Work cooperatively - regional and statewide to develop a new local resource
• Develop an objective process for permitting future local facilities
• Provide water supply reliability through a drought-proof supply
• Improve technology through more R&D: gain efficiency and reduce cost
• LADWP is evaluating desalination as a potential water resource to provide reliability and partly compensate for supplies reallocated to the environment
• The pilot research project at Scattergood will provide needed data and information that can be used to make future informed decisions
• The pilot project will evaluate the most feasible options for developing desalination
Summary
• Beyond the pilot research study, no decision has been made on the future of seawater desalination for Los Angeles
• LADWP is now undertaking prudent research and has initiated dialogue with stakeholders
Thank you.
Summary