With HEC-RAS 1D in SMS, you can take advantage of all the tools offered in SMS to build your HEC-RAS 1D project. This includes tools to extract cross sections and centerlines from imported data or existing projects. SMS's editing tools can also be used to adjust the centerline or cross section before importing the project into HEC-RAS. Furthermore, SMS allows you to use profile plots and the various viewing options to review your cross sectional data. It is recommended that you review your HEC-RAS 1D project in SMS before exporting the project file.

HEC-RAS and SMS together increase your water modeling options. Try out using the reintroduced HEC-RAS 1D in SMS 13.1

The Hydrologic Engineering Center's River Analysis System (HEC-RAS) is a one- and two-dimensional model for computing water surface profiles for steady state or gradually varied flow. HEC-RAS supports networks of channels and is capable of modeling subcritical, supercritical, and mixed flow regime profiles. HEC-RAS is able to model obstructions in the flow path. Two dimensional capabilities were added to HEC-RAS 5.0 in 2016.

Historically, SMS and WMS have supported tools for creating and editing cross sections and attributes for these cross sections for one dimensional HEC-RAS 1D. These cross sections can be imported from the HEC-RAS system in the form of an SDF file (exported by HEC-Ras) and saved as a HEC-GeoRAS file for inclusion into a HEC-RAS project. The WMS package has also developed floodplain mapping tools to generate floodplains from HEC-RAS results.

With the 2D version of HEC-RAS, a new SMS interface to HEC-RAS has been added (starting with SMS 12.2). This new interface is a simulation-based interface that allows defining multiple simulations with individual settings in a single SMS project. All of the mesh generating options supported in the SMS may be used to generate/edit a grid for use in HEC-RAS 2D.

SMS continues to include tools for defining river networks and cross-sections.