Farm Process (FMP) Parameters used in the Central Valley Hydrologic Model (CVHM)

Release Date

2012-01-01

Publication Date

2023-09-15

Faunt, C.C., 2012, Farm Process (FMP) Parameters used in the Central Valley Hydrologic Model (CVHM): U.S. Geological Survey data release, https://doi.org/10.5066/P9MVWCP8.

Type: Related Primary Publication Type: browseImage

The farm process parameters values were used as input to MODFLOW-FMP, the USGS 3-dimensional finite-difference code used to simulate flow in the CVHM. For the CVHM, the processes of evaporation, transpiration, runoff, and deep percolation to groundwater were estimated using the Farm Process (FMP). The FMP allocates water, simulates or approximates processes, and computes mass balances for defined subregions of the model domain; in the CVHM, these subregions, or farms, are defined as the water-balance subregions. MODFLOW-FMP estimates irrigation water allocations from conjunctively used surface water and groundwater. It is designed to simulate the demand components representing crop irrigation requirements and on-farm inefficiency losses, and the supply components representing surface-water deliveries and supplemental groundwater pumpage. The FMP also simulates additional head-dependent inflows and outflows such as canal losses and gains, surface runoff, surface-water return flows, evaporation, transpiration, and deep percolation of excess water (Faunt, 2009). Hence, the CVHM is a tool that accounts for integrated, variable water supply and demand, and simulates surface-water and groundwater-flow across the entire Central Valley system.

• Model Data Management Function (MDMF)