The Surface Water Modeling System (SMS) is a comprehensive environment for one-, two, and three-dimensional hydrodynamic modeling. A pre- and post-processor for surface water modeling and design, SMS includes 2D finite element, 2D finite difference, 3D finite element modeling tools.
The numeric models supported in SMS compute a variety of information applicable to surface water modeling. Primary applications of the models include calculation of water surface elevations and flow velocities for shallow water flow problems, for both steady-state or dynamic conditions. Additional applications include the modeling of contaminant migration, salinity intrusion, sediment transport (scour and deposition), wave energy dispersion, wave properties (directions, magnitudes and amplitudes) and others.

Link to website : http://www.ems-i.com/SMS/SMS_Overview/sms_overview.html

The Surface Water Modeling System (SMS) supports coastal circulation modeling with advanced finite-element and finite-difference models.
- ADCIRC (ADvanced CIRCulation Multi-dimensional Hydrodynamic Model) is a latest-generation multidimensional model based on the solution of the generalized wave equation formulation of the governing equations on a highly flexible unstructured grid.
- CMS-Flow - The hydrodynamic circulation model CMS-Flow is a two-dimensional, finite-difference numerical approximation of the depth-integrated continuity and momentum equations.
- TUFLOW - TUFLOW is a computational engine that provides two-dimensional (2D) and one-dimensional (1D) solutions of the free-surface flow equations to simulate flood, storm surge and tidal wave propagation.

Wave modeling is also supported by SMS. Once again, finite-difference or finite-element models are available. These models can analyze wave action to predict wave height and velocity:
- STWAVE (STeady State Irregular WAVE Model) is a model that is computationally efficient steady state spectral wave energy propagation model.
- CGWAVE models harbor response taking into account outside sea state, harbor shape and man-made structures (i.e., piers, breakwaters, naval vessels). It is a forecasting and nowcasting tool used in coastal and military planning and civil engineering.
- BOUSS2D is a comprehensive numerical model for simulating the propagation and transformation of waves in coastal regions and harbors based on a time-domain solution of Boussinesq-type equations.
- CMS-Wave - Wave-Action Balance Equation with Diffraction model. The CMS-Wave model is a near shore wave transformation model capable of representing wave diffraction and reflection.

In addition to hydrodynamics, SMS offers the capability to analyze pollutant and/or sediment transport in your waterway system.
RMA4 - A constituent migration modeling code that has the ability to compute constituent concentrations and dispersion when supplied with a hydrodynamic solution computed by RMA2.
- FESWMS - Newly implemented sediment transport capabilities in FESWMS allow seamless coupling of hydrodynamics and sediment transport.