San Diego Hydrogeology

Geologic Framework Model

A geologic framework model is a three-dimensional mathematical representation of the sediment and rocks that comprise and surround an aquifer. It includes the land-surface elevation, depth and thickness of geologic layers, and location and angle of faults. By combining these elements in a mathematically rigorous way, geologic maps and cross-sections can be visualized and tested. Alternative ideas of how the geologic structure is put together can be evaluated. The final product is fully 3-D, a grown-up version of the traditional fence diagram. Visualization software allows the user to rotate the geologic framework model, view it from many angles, and see underneath and inside. This process ensures that major geologic concepts are embodied accurately in the model, and provides the basis for creating credible groundwater flow models.

Project Chief: Wes Danskin
Phone: 619-225-6132

Welcome to the United States Geological Survey (USGS) San Diego Hydrogeology project website, which provides geologic and hydrologic information for the transboundary San Diego–Tijuana area, USA and Mexico. This website provides background information about the project; a variety of news items; a large amount of data, in particular for USGS multiple-depth, monitoring-well sites; geologic and hydrologic models; and additional resources including photos, illustrations, and references. Last updated: April 2016

Some additional data may be available from the USGS database National Water Information System (NWIS).

Questions about San Diego Hydrogeology? Please contact Wes Danskin (email: or send a letter). 619.225.6132