The Department of Water Resources (DWR) has developed a web-based application to inform local agencies and the Public about the existing Bulletin 118 groundwater basins and other relevant geologic and geographic data. The Groundwater Basin Boundary Assessment Tool is an interactive map application that allows users to overlay numerous Geographic Information Systems (GIS) layers onto a map of California, and allows for those GIS layers to be toggled on and off while varying each layer's transparency. Each data layer includes a brief description and a location or source where the user can find additional information regarding that layer. The Groundwater Basin Boundary Assessment Tool is intended to assist local agencies with their planning efforts related to basin boundary modifications.
Application Use Disclaimer
This application provides a graphic representation of groundwater basin boundary and water management boundary data for informational purposes only. These boundaries are not definitive and do not establish legal rights or define legal boundaries.
During the Beta trial of this application, the ability to download GIS layers is disabled. In the future, the user will be able to download these layers as GIS shape files with attached metadata.
User Experience Tips
During this testing phase your experience with the Groundwater Basin Boundary Assessment Tool may vary depending on your web browser and settings. The application functions in the most recent version of Internet Explorer, Mozilla Firefox, and Google Chrome; however, Chrome may provide the best user experience. For questions or more information about the map interface please visit the help page.
The application does not function in Internet Explorer 8 or earlier.
The search feature does not function in Internet Explorer 9.
Transparency occasionally doubles. If you are having trouble with the transparency, pan the map view and this should correct the issue.
If you are having trouble with the application and would like to provide us with feedback, please include the name of the browser you are using (Internet Explorer, Google Chrome, Mozilla Firefox, Safari, etc.) and the browser mode or version, as this helps the development process.
If you have questions about the presentation of data in the map, or have other comments, please provide them directly to:
Department of Water Resources
North Central Region Office