This digital dataset defines the farm-process parameters used in the transient hydrologic model of the Central Valley flow system. The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code MODFLOW-FMP. This simluation is referred to here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). 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. The Farm Process parameters for Crops, Root Depth, Runoff, Pressure, Crop Coefficients (Kc), Transpiratory fraction of consumptive use (FTR), Evaporative fraction of consumptive use related to precipitation (FEP), and Evaporative fraction of consumptive use related to irrigation (FEI) are all tabulated. More detailed descriptions of these parameters can be found in Schmid and others (2006b) and Faunt and others (2009). The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details).