Water-balance subregions (WBSs), soil types, and virtual crops for the five land-use time-frames used in the Central Valley Hydrologic Model (CVHM)

Release Date

2012-01-01

Publication Date

2023-09-15

Faunt, C.C., 2012, Water-balance subregions (WBSs), soil types, and virtual crops for the five land-use time-frames used in the Central Valley Hydrologic Model (CVHM): U.S. Geological Survey data release, https://doi.org/10.5066/P941D0QK.

Type: Related Primary Publication Type: browseImage

The model grid, water-balance subregions (WBSs), soil type, and virtual crops for the five land-use time frames values were used as input to MODFLOW-FMP, the USGS 3D finite-difference code used to simulate flow in the CVHM. The one-square-mile cells were used to define the resolution and extent of the CVHM. For the CVHM, the processes of evaporation, transpiration, runoff, and deep percolation to groundwater were estimated using the Farm Process (FMP1) (Schmid and others, 2006). 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)