Welcome to MODFLOW.com - Home of the most popular groundwater model and companion models in the world. You can find technical information on each model (MODFLOW, MODPATH, MT3D, RT3D and MODFLOW-SURFACT) from developers and commercial partners in the groundwater modeling industry. In addition, you will find links to graphical software to help you use these models more efficiently and produce impressive graphical results.
					Image courtesy of Hydrogeologic, Inc.

	MODFLOW is the most widely-used 3D groundwater flow model in the world. MODFLOW can represent the effects of wells, rivers, streams, drains, horizontal flow barriers, evapotranspiration, and recharge on flow More.......		MODPATH is a 3D particle-tracking model that computes the path a particle takes in a steady-state or transient flow field over a given period of time. MODPATH uses the head values and cell-by-cell flow More.......		MT3D is a 3D contaminant transport model that can simulate advection, dispersion, sink/source mixing, and chemical reactions of dissolved constituents in groundwater flow systems. More.......		RT3D is a software package for simulating three-dimensional, multispecies, reactive transport in groundwater. The code is based on the 1997 version of MT3D (DOD_1.5), but has several extended reaction capabilities. More.......		MODFLOW-SURFACT is a powerful three-dimensional finite-difference flow and transport program containing many advancements and improvements over the standard public-domain versions of MODFLOW. More.......