What is MODFLOW?

MODFLOW is a modular finite-difference groundwater model developed by the U.S. Geological Survey (USGS). It's a widely used simulation program for modeling groundwater flow and solute transport. It's commonly used by hydrogeologists and engineers to simulate groundwater systems, predict the impacts of pumping or recharge, and evaluate groundwater management strategies. MODFLOW is often coupled with other models to simulate surface water-groundwater interactions, contaminant transport, and subsidence.