Some bridges (see figure below) have more than one opening for flood flow, especially over a very wide floodplain. Multiple culverts, bridges with side relief openings, and separate bridges over a divided channel are all examples of multiple opening problems. With more than one bridge opening, and possible different control elevations, the problem can be very complicated. HEC-RAS can handle multiple bridge and/or culvert openings. Detailed discussions on how to model multiple bridge and/or culvert openings is covered under "Modeling Multiple Bridge and/or Culvert Openings" of the HEC-RAS Hydraulic Reference manual and "Modeling Culverts" of the User's manual.
