TO: Technical Advisory Group for the Napa County Groundwater Sustainability Agency
FROM: Brian Bordona - Director of Planning, Building and Environmental Services
REPORT BY: Jamison Crosby, Natural Resources Conservation Manager
SUBJECT: Water Year 2023 Annual Report
RECOMMENDATION
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The Technical Advisory Group (TAG) members will receive a presentation from Luhdorff and Scalmanini, Consulting Engineers (LSCE) on the Water Year 2023 Annual Report model results and update on groundwater conditions in Napa County with a focus on the Napa Valley Subbasin and an update on Groundwater Sustainability Plan implementation. This presentation builds on the December 14, 2023 presentation that reviewed groundwater elevation data.
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EXECUTIVE SUMMARY
As in the past nine consecutive annual reports, this Water Year 2023 Annual Report includes an update on groundwater conditions in the Napa Valley Subbasin and elsewhere in Napa County. This is the third Annual Report prepared to support implementation of the Napa Valley Subbasin Groundwater Sustainability Plan (GSP), adopted by the Napa County Groundwater Sustainability Agency (NCGSA) in January 2022 and approved by the California Department of Water Resources (DWR) on January 26, 2023. This Report reflects an ongoing commitment by the County and NCGSA to sustainably manage groundwater resources by implementing an adaptive management approach supported by best available information. To better manage and respond to changing conditions, the NCGSA formed a Technical Advisory Group (TAG) to advise the NCGSA and aid in the implementation of the Napa Valley Subbasin GSP. The five-member committee was first convened on August 11, 2022.
Water Year 2023 (defined as October 1, 2022 through September 30, 2023) experienced lower temperatures and higher precipitation than average throughout Napa County and the Napa Valley Subbasin. Water Years 2020 and 2021 registered as the driest consecutive years since at least the 1890s, as m...
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