COMMITTEE AGENDA MEMORANDUM
Capital Improvement Program Committee
SUBJECT:
title
Calero Dam Seismic Upgrade and Water Reliability Analysis.
End
RECOMMENDATION:
Recommendation
Receive information and provide direction to staff.
Body
SUMMARY:
Calero reservoir contributes to both annual water supply and operational reliability. On an annual basis, Calero is capable of providing up to 9,500 acre-feet (AF) of water supply. However, due to structural deficiencies found in the dam, the reservoir is under a seismic restriction limiting normal storage to 4,585 AF. The capital project currently at approximately 60% design, will address the structural deficiencies restoring the reservoir's full storage capacity as well as expanding the reservoir outlet capacity.
Because the reservoir is local, Calero provides a local water supply source which is used to recharge the groundwater basin and can also supply raw water directly to the District's surface water treatment plants. This helps in responding to imported water outages and is critical to the District's disaster recovery plan.
Water Supply:
Calero reservoir has an associated water right of 3,500 AF per year from the Calero Creek watershed. In addition, Calero Reservoir is the terminus for the Almaden-Calero Canal water right which allows up to 6,000 AF to be transferred from Almaden Reservoir each year into Calero Reservoir. Combined, these two water rights can provide up to 9,500 AF each year towards meeting the County's overall water supply needs.
Calero Reservoir also provides local storage for imported water supplies, typically Central Valley Project (CVP) supplies brought in from San Luis Reservoir. From a turnout on the Cross Valley Pipeline, CVP supplies (as well as water from Anderson Reservoir) can be released directly into Calero Reservoir for storage and later use. This adds flexibility to the District's raw water system providing an in-county storage option which allows the District to take delivery ...
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