Los Banos Detention Dam

1
Los Banos Detention Dam

• Safety of Dams Project

2
Introductions

• Doug McElhinney, Project Manager
• Kay Moore, Repayment Specialist
• Craig Stroh, Financial Economist

3
Safety of Dams Process

• SEED Funds (Non-Reimbursable Funding)
• Comprehensive Facility Review
• Issue Evaluation
• SOD Funds (15 Reimbursable Funding)
• Corrective Action Study
• Modification

4
Los Banos Detention Dam

• Zoned Earthfill Embankment Dam
• Constructed in 1966
• Reservoir Impounds 52,000 Acre-Feet
• 167 Feet High, 1,370 Feet Long
• Spillway 20 Feet Wide x 30 Feet High
• Maintained by California DWR
• Protects California Aqueduct / San Luis Canal and
  the Delta Mendota Canal

5
Issue Evaluation

• Potential for Hydrologic Overtopping Investigated
• Conservative Assumptions, No Site-Specific Data
• Annual Probability About 1/1000
• Loss of Life Estimated to be 11-24
• Reclamation Guidelines Suggest Take Action
• Subsequent CFR Advises Risks May be Lower

6
Risk Portrayal Diagram
7
Corrective Action Study

• Decision Memorandum (November 2003)
• Emergency Planning
• Public Awareness
• Hydrologic Studies
• Water User Involvement/Repayment
• Corrective Action Alternatives
• Project Management Plan
• Environmental Compliance
• Preferred Alternative and Cost Estimates
• Modification Report to OMB and Congress

8
Possible Alternatives

• Raise the Dam
• Increased Spillway Capacity
• Smaller Dam Raise w/ Auxiliary Spillway
• Build New Dam Upstream
• Armor the Dam to Resist Erosion
• Do Nothing

9
Cost and Schedule

• BOR Estimated 17M to 29 M for Construction
  Costs in Jan 1987
• DWR Estimated 11M to 61M for Construction Costs
  in Feb 2002
• Scoping Meeting January 2005 ???
• Typically Takes 5-10 Years from Start to Finish
  for SOD Modification Projects
• 55 State/ 45 Federal Cost Share
• CVP Repayment 15 of 45 (About 7)

10
Water User Communications

• CVPWA Financial Affairs Committee
• Progress Briefing Every Three Months
• Letter to CVP Conveyance Contractors
• Financial Reports Posted on the Internet

11
Standard Financial Report
12
Conclusion

• Keep Water Users Informed
• CVPWA FAC Proper Forum
• Comments ?
• Questions ?