HEC-RAS Features

BOSS HEC-RAS is based on the U.S. Army Corps of Engineers’ HEC-RAS water surface profile model used for modeling both steady and unsteady, one-dimensional, gradually varied flow in both natural and man-made river channels. BOSS HEC-RAS also allows sediment transport/mobile bed computations and water temperature modeling.

• Steady and unsteady flow modeling
• Mixed flow regime analysis, allowing analysis of both subcritical and supercritical flow regimes in a single computer run
• Bridge and culvert analysis and design, including FHWA culvert routines for elliptical, arch, and semi-circular culverts
• Multiple bridge and culvert openings of different types and sizes at a roadway crossing
• Bridge scour computations following FHWA Publication HEC-18
• Bridge design editor and graphical cross section editor
• FEMA Floodplain and floodway encroachment modeling
• Multiple profile computations
• Lateral flow, split flow, overbank dendritic networks
• Sediment Transport/Movable Bed Modeling
• Sediment Impact Analysis Methods (SIAM)
• Water Quality Capabilities (Temperature Modeling)
• Tidal boundary conditions
• Reservoir and spillway analysis
• Levee overtopping
• User Defined Rules for Controlling Gate Operations
• Pumping of flooded areas
• Modeling Pressurized Pipe Flow
• Geometric model schematic can be placed over background maps and incorporate clickable scanned images of structures
• Inline weirs and gated spillways analysis, including both radial and sluice type gates and Ogee, broad and sharp crested weirs
• Tributary/diversion flow network capabilities, allowing for fully looped river system analysis in which reaches can be subdivided and combined
• Quasi 2-D velocity distributions
• X-Y-Z (pseudo 3-D) graphics of the river system