Does the water budget account for extractors of groundwater and surface water outside of the Subbasin?

SGMA and DWR GSP Regulations require that GSPs include a water budget that quantifies inflows to, outflows from, and changes in storage for the relevant groundwater basin or subbasin. For this reason, the water budget presented in the GSP will address the Napa Valley Subbasin. However, the County and technical team recognize the potential for land uses adjacent to the Subbasin to affect the Subbasin water budget and have expanded the Napa Valley Integrated Hydrologic Model (MODFLOW-OWHM) domain to include areas adjacent to the Napa Valley Subbasin including the Milliken-Sarco-Tulucay and Carneros Subareas as well as other areas of developed land use that are contiguous with the Subbasin. These additional areas include areas served by the City of Napa potable water system west of the Subbasin, the Yountville Veterans Home, and agricultural lands contiguous with the Subbasin boundary.

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1. What is a GSP?
2. What are required elements of a GSP?
3. How do the GSP and the Napa Valley Integrated Hydrologic Model account for future development?
4. Does the water budget account for extractors of groundwater and surface water outside of the Subbasin?
5. What is the timeline for GSP submittal?
6. How is the GSP related to the Napa Valley Drought Contingency Plan?
7. Return to the Groundwater FAQ page