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Prado Basin Feasibility Study Cost-Benefit Analysis

Prado Basin Feasibility Study Cost-Benefit Analysis. Water Issues Committee March 14, 2018. Prado Basin Feasibility Study. Agreement with Army Corps established District as non-federal (local) sponsor Feasibility Study includes Ecosystem restoration

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Prado Basin Feasibility Study Cost-Benefit Analysis

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  1. Prado Basin Feasibility Study Cost-Benefit Analysis Water Issues Committee March 14, 2018

  2. Prado Basin Feasibility Study • Agreement with Army Corps established District as non-federal (local) sponsor • Feasibility Study includes • Ecosystem restoration • Water conservation (temporary stormwater capture) • Sediment management

  3. Ecosystem Restoration Measures in Feasibility Study These are a range of features to enhance the environment, including: • Non-native plant removal • Non-native animal removal (aquatic species & feral pigs) • Sediment removal • Modifications to Chino Creek to restore riparian habitat

  4. Sedimentation in Prado Basin • From 1941 to 2008, lost 25,000 acre-feet of storage below 505 ft elevation • 20,000 acre-feet remaining as of 2008 survey • Sedimentation in Prado Basin will essentially eliminate water conservation storage in 50 years if not addressed • Loss of 30,000 acre-feet per year of water

  5. Sediment Management Measures • Capture sediment in general area of River Road bridge • Captured sediment is either: • Moved to storage sites away from the river channel, generally around perimeter of Prado Basin – accessible for future aggregate use or other beneficial re-use; or • Re-entrained into SAR below Prado Dam

  6. Summary of Alternatives

  7. Cost-Benefit Analysis Assumptions • Cost of firm untreated water purchased from Metropolitan and O&M for project inflates 3% per year • Annual capital cost is estimated based on a 5% interest loan over 50 years. • Increased storage space created by sediment management is utilized one time per year.

  8. Cost Share between Corps & OCWD • Water Conservation: 100% OCWD cost • Ecosystem restoration: construction 65% Corps, 35% OCWD • O&M: 100% OCWD is standard • Can request federal cost share of O&M due to unique nature of sediment management costs (higher percentage of O&M relative to construction cost) • Exploring phased implementation of some project measures, such as sediment management measures

  9. Summary of Plan 9

  10. Summary of Plan 11

  11. Summary of Plans 9 & 11

  12. Next Steps • Reviewing cost increase to complete Study from Corps • Evaluate sensitivity to assumptions in cost benefit analysis • Release draft Feasibility Study report for public comments (includes draft EIR) • OCWD identify preferred alternative

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