MODFLOW is a finite-difference groundwater flow modeling program, written by the United States Geological Survey (USGS), which allows you to develop a numerical representation (i.e. a groundwater model) of the hydrogeologic environment at a field site that you are investigating.
It uses the finite-difference method to divide the groundwater flow model domain into a series of rows, columns and layers, which defines a unique set of grid blocks (i.e. model cells) to represent the distribution of hydrogeologic properties and hydrologic boundaries within the model domain. When you develop a groundwater model, you assign properties and boundaries to these model cells, and MODFLOW uses the cell dimensions, property values and boundary values to write a set of finite-difference equations that it solves to calculate the hydraulic head at the center of each model cell.
Recent additions to Visual MODFLOW Flex include cell-based editing for most of the boundary conditions, statistics for the charts, a simplified engine manager, and options to edit attributes for numerical boundary conditions.
Various improvements were also made to the Visual MODFLOW Classic interface. Defects related to SEAWAT simulations, importing initial concentrations for large models and the multi-node well (MNW) package have been addressed.
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