TO: Technical Advisory Group (TAG) for the Napa County Groundwater Sustainability Agency
FROM: Brian D. Bordona, Director of Planning, Building and Environmental Services
REPORT BY: Jamison Crosby, Natural Resources Conservation Manager
SUBJECT: Napa County groundwater monitoring networks and associated data gaps
RECOMMENDATION
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The TAG will receive an overview of Napa County groundwater monitoring networks and associated data gaps.
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BACKGROUND AND DISCUSSION
Napa County has long identified the importance of groundwater, surface water, and their interactions. Monitoring of these important natural resources has been conducted by multiple entities, including the United States Geological Survey (USGS), California Department of Water Resources (DWR), and Napa County. In 2013, Napa County reviewed and updated their groundwater monitoring plan and implemented numerous improvements. Annual reporting of groundwater resources for the entirety of Napa County began in 2014. Building on decades of historical monitoring, Napa County formalized nine (9) monitoring networks within the Napa Valley Subbasin Groundwater Sustainability Plan (GSP; 2022). As part of the GSP, data gaps associated with each monitoring network were identified with an associated plan to address the data gaps. During the past two and a half years of GSP implementation activities, many data gaps have been addressed.
The GSP established nine (9) monitoring networks with different measurement types.
? Groundwater Level Monitoring Network
o Groundwater levels
? Groundwater Storage Monitoring Network
o Groundwater levels
o Napa Valley Integrated Hydrologic Model (NVIHM)
? Land Subsidence Monitoring Network
o Groundwater levels
o Benchmark monitoring
o InSAR data
? Stream Stage and Stream Discharge Monitoring Network
o Stream stage and discharge measurements
o Stream Watch program
o Napa Flood Control Monitoring system
? Interconnected Surface Water-Groundwater
o Groundwater levels
o NVIHM
? Groun...
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