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Mt3dmain: Mt3dmain is a graphical user interface for MT3D, a modular three-dimensional transport program developed by Papadopulos and Associates for the U.S. Environmental Protection Agency (EPA). MT3D is a program designed to model contaminant transport based on a pre-solved ground-water flow model (MODFLOW is often used to solve the ground water flow equations). MT3D uses the solution aquifer heads to base the transport results). In its basic form, MT3D can be difficult, or awkward to use. The mt3dmain program module is designed to simplify data entry, model editing, and analysis of results.