SMS:SRH-2D Structures

SRH-2D has the capability to model hydraulic structures including: bridges, culverts, gates, and weirs.

Culvert

A small culvert under a pedestrian walkway.

A structure that allows water to flow under a road, railroad, trail, or similar obstruction. SRH-2D can make use of culvert structures by coupling with the Federal Highway Administrations HY-8 culvert analysis application.

Specific guidelines include:

• The user must specify a file (path and name) where all HY-8 crossing definitions used in this boundary condition coverage are stored. This is accessed by right clicking on the coverage and selecting "HY-8 Options".
• The user must define the crossing before running SRH-2D. The crossing definition can be accessed in the boundary condition dialog after assigning the arcs to be a culvert.
• HY-8 computes flow both through the culvert and over the road/weir above the culvert. Attributes are specified in the crossing definition.

Gate

Gate structures can simulate both overflow and underflow gates.

Pressure Flow Bridge

A bridge can be represented as a pressure flow boundary condition in SMS.

• The pressure zone definition defines a ceiling elevation that can vary linearly from the upstream arc to the downstream arc. This could also be side to side if the arcs are defined as the sides of the bridge instead of upstream/downstream. More complex ceiling elevation variation can be simulated using multiple pairs of pressure flow arcs.
• The pressure zone cannot touch any mesh/grid boundaries nor can voids in the mesh be defined in the pressure zone.
• Pressure zones do not allow any overtopping.

Weir

A barrier across a river designed to alter its flow characteristics. In SMS, a weir can be represented as two arcs. One arc represents the upstream face of the weir structure and the other represents the downstream face of the weir.

Related Topics

• Boundary Conditions Coverage