• Detailed 2D channel and floodplain modeling
• Combined 1D channel flow with 2D floodplain flow areas
• Combined 1D channel and overbank flow with 2D flow areas behind levees
• Simplified to detailed dam failure i.e., dam breach analyses
• Simplified to detailed levee failure i.e., levee breach analyses
• 1D flow that suddenly expands laterally into the floodplain overbank area
• Flow outside of well-defined single channel
• Interconnected or braided streams, meanders, loops
• Alluvial fans and estuaries
• And many other situations…
HEC-RAS
2D Implicit Finite Volume Solution Algorithm
2D Computational Time Step ion
2D Computational Output Settings
2D Computational Volume Accounting
2D Flow Area External Boundary Conditions
2D Flow Area Internal Boundary Conditions
2D Flow Area Internal Connection
2D Flow Area Elements
2D Flow Area Mesh Types
Mesh Editing
2D Flow Area Breaklines
2D Ineffective Flow Areas
2D Conveyance Obstructions
2D Bridge Modeling
2D Culvert Modeling
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