Location of General Head Boundaries (GHB) in the Central Valley Hydrologic Model (CVHM)
This digital dataset represents the area where lateral flow into and out of the Central Valley groundwater-flow system occurs. 
The General Head Boundary (GHB) is set to 0 and is only in the Delta and is specified in layer 1 where the groundwater 
system intersects the surface water system. The Central Valley …