RMA2 is a hydrodynamic modeling code that supports subcritical flow analysis, including wetting and drying and marsh porosity models. It is part of the TABS analysis package written by the U.S. Army Corps of Engineers Waterways Experiment Station (USACE-WES). The methods of analysis used by the TABS codes along with their file formats and input parameters are described in their own documents. SMS supports both pre- and post-processing for RMA2.

A mesh for use with RMA2 is created and edited in SMS using the Mesh Module. The modeling parameters required by RMA2 are generated and applied to the mesh using commands grouped in the RMA2 menu. Post processing of solution data generated by RMA2 is done using the generic visualization tools of SMS