TO: Napa County Flood Control and Water Conservation District
FROM: Richard Thomasser - District Manager
REPORT BY: Christopher Silke - Engineering Manager for Water Resources
SUBJECT: 2025 Regional Water Supply Forecast
RECOMMENDATION
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Presentation on the annual water supply outlook for Napa County and its communities. (No Fiscal Impact)
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BACKGROUND
December 2024 and February 2025 winter storms brought warm atmospheric river events to Northern California that saturated watershed drainages with tributary runoff filling and spilling small- to medium-sized reservoirs. Majority of large reservoir levels statewide are greater than 100 percent of their historical average. Sierra snowpack is below average particularly in the San Joaquin drainage prompting the Department of Water Resources to release cautionary allocation notices to Water Contractors. DWR studies assigned a North of Delta Table A allocation of 55 percent maximum contract entitlement (29,025 AF) or 15,964 acre feet of water at the end of February 2025. Napa County FC&WCD and its City Agency State Water Project subscribers have 15,258 acre feet of Article 56(c) carryover stored in San Luis Reservoir. North Bay Aqueduct water deliveries have ranged 9,700 to 12,000 AF over the past five (5) years. Local water resource use, system operations and maintenance planning, and water conservation through the recent multi-year drought account for this annual variability. Staff will brief the Board on latest climate, hydrology, storage levels, State Water Project allocations and what the implications are for Napa County in terms of water supply for the remainder of this year.
FISCAL & STRATEGIC PLAN IMPACT
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Is there a Fiscal Impact? |
No |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: The proposed action is not a project as defined by 14 California Code of Regulations 15378 (State CEQA Guidelines) and therefore CEQA is not applicable.