INFIL3.0 is a grid-based, distributed-parameter, deterministic water-balance model that calculates the temporal and spatial distribution of daily net infiltration of water across the lower boundary of the root zone. The bottom of the root zone is the estimated maximum depth below ground surface affected by evapo- transpiration. In many field applications, net infiltration below the bottom of the root zone can be assumed to equal net recharge to an underlying water-table aquifer. The daily water balance simulated by INFIL3.0 includes precipitation as either rain or snow; snowfall accumulation, sublimation, and snowmelt; infiltration into the root zone; evapotranspiration from the root zone; drainage and water-content redistribution within the root-zone profile; surface-water runoff from, and run-on to, adjacent grid cells; and net infiltration across the bottom of the root zone.
The water-balance model uses daily climate records of precipitation and air temperature and a spatially distributed representation of drainage-basin characteristics defined by topography, geology, soils, and vegetation to simulate daily net infiltration at all locations, including stream channels with intermittent streamflow in response to runoff from rain and snowmelt. The model does not simulate streamflow originating as ground-water discharge. Drainage- basin characteristics are represented in the model by a set of spatially distributed input variables uniquely assigned to each grid cell of a model grid.
INFIL3.0 Version 1 06/19/2008 - Initial release.
INFIL3.0 is written in Fortran. A Fortran-90 compiler is required to recompile the program. The code has been used on personal computers running various forms of the Microsoft Windows operating system.
U.S. Geological Survey, 2008, Documentation of computer program INFIL3.0--A distributed-parameter watershed model to estimate net infiltration below the root zone: U.S. Geological Survey Scientific Investigations Report 2008-5006, 98 p. ONLINE ONLY
Example Applications of Previous Versions of INFIL
Previous versions of INFIL were used in hydrologic investigations described in the following reports:
Hevesi, J.A., Flint, A.L., and Flint, L.E., 2002 Preliminary estimates of spatially distributed net infiltration and recharge for the Death Valley Region, Nevada-California: U.S. Geological Survey Water-Resources Investigations Report 02-4010, 36 p. https://pubs.usgs.gov/wri/wri024010/
Hevesi, J.A., Flint, A.L., and Flint, L.E., 2003, Simulation of net infiltration and potential recharge using a distributed-parameter watershed model of the Death Valley region, Nevada and California: U.S. Geological Survey Water-Resources Investigations Report 03-4090, 171 p. https://pubs.usgs.gov/wri/wri034090/
Nishikawa, Tracy, Izbicki, J.A., Hevesi, J.A., Stamos, C.L., and Martin, Peter, 2004, Evaluation of geohydrologic framework, recharge estimates, and ground-water flow of the Joshua Tree area, San Bernardino County, California: U.S. Geological Survey Scientific Investigations Report 2004-5267, 115 p. https://pubs.usgs.gov/sir/2004/5267/
Rewis, D.L., Christensen, A.H., Matti, Jonathan, Hevesi, J.A., Nishikawa, Tracy, and Martin, Peter, 2006, Geology, ground-water hydrology, geochemistry, and ground-water simulation of the Beaumont and Banning storage units, San Gorgonio Pass area, Riverside County, California: U.S. Geological Survey Scientific Investigations Report 2006-5026, 173 p. https://pubs.usgs.gov/sir/2006/5026/
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