Use HEC-RAS (3.1) for determining water surface elevations throughout a river network, and analyzing bridges and culverts.

Hydraulics
Use the unsteady flow routing features for dam break analysis and levee breaching.
Calculate water surface profiles based on steady, gradually varied flow for channel networks, dendritic systems, or a single river reach.
Evaluate floodway encroachments for floodplain management and insurance studies.
Handle rapidly varied flow conditions automatically, such as hydraulic jumps and bridge contractions.
Include in-line weirs and gated spillways in the river system.
Compute bridge scour based on the routines outlined in HEC-18 from the Federal Highway Administration.
Follow the methods for low-flow computations laid out by the Federal Highway Administration using the WSPRO bridge routines.
Analyze culverts under supercritical and mixed flow regimes, and even adverse slopes.
 

Output
View the results three-dimensionally with X-Y-Z perspective plots.
Use the built-in tables to create standard reports, including cross-section tables, bridge tables, culvert tables,
Include the graphical river system schematic, cross-sections, profiles, and more in your final report.