BOARD AGENDA MEMORANDUM
SUBJECT:
Title
Calero Reservoir Operations and System Reliability.
End
RECOMMENDATION:
Recommendation
A. Receive an update on the operation and use of Calero Reservoir; and
B. Direct staff to proceed with the Calero Seismic Retrofit Project.
Body
SUMMARY:
In 2012, a seismic evaluation of the Calero Dam determined the need to modify the facility to provide seismic stability from earthquake events. Accordingly, the California Department of Water Resources Division of Safety of Dams (DSOD) mandated operational restrictions, limiting reservoir storage to 46 percent of its normal capacity. A retrofit of the 80-year-old dam and associated facilities is necessary to address seismic safety concerns, satisfy Santa Clara Valley Water District (Valley Water) operational requirements, remove the interim storage restriction, and restore normal water supply capacity.
Staff recommends that Valley Water proceed with the Calero Seismic Retrofit Project, as outlined in the proposed FY 2020-2024 Capital Improvement Program, based on the Operations and System Reliability Analysis presented below. This information has also been presented for discussion to the Board's Capital Improvement Program Committee on March 11, 2019.
Background
Over the past 90 years, Valley Water has built an integrated and flexible water supply and conveyance system to provide a reliable water supply to the residents of Santa Clara County (County). The network of ten surface water reservoirs, 19 major water rights, two imported water supplies, groundwater recharge facilities, treatment plants and conveyance pipelines work together to meet the water supply needs of the County.
Valley Water's ability to supply water depends on the ongoing use and function of these past investments and, as they age, ongoing investment is required. In recognition of the value of, and Valley Water's dependence on, these assets, the Valley Water Board has adopted policies to protect and m...
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