MT3D-USGS in GMS 10.3

GMS 10.3 will include preliminary support for MT3D-USGS, a new transport model from the USGS that is based on MT3DMS and which allows for transport through the unsaturated zone, among other things. Here's a simple animation made in GMS showing a contaminant dropping through the unsaturated zone, hitting an aquitard, and spilling over the edges. This animation is based on a new tutorial that will be included with GMS 10.3 on how to use MT3D-USGS in GMS.