The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. The CVHM grid has a uniform horizontal discretization of 1x1 square mile and is oriented parallel to the valley axis, 34 degrees west of north (Faunt, 2009). Slightly less that 50 percent of the cells are active. The total active modeled area is 20,334 square-miles on a finite-difference grid comprising 441 rows and 98 columns. Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. This application is referred to here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code, MODFLOW-FMP (Schmid and others, 2006). The Central Valley encompasses an approximate 50,000 square-kilometer region of California. 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. This digital dataset represents the area where lateral flow into and out of the Central Valley groundwater-flow system occurs.
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