Water levels are often influenced significantly by bridges within the watercourse. The normal river equations (Saint-Venant equations) are not always appropriate for application to these structures. Explicit modelling of bridges within the watercourses is therefore required in most cases.
Flood Modeller provides three bridge units to select from:
It is also possible to add a Spill unit to allow flow to bypass the structure via the deck of the bridge or culvert and return to the channel downstream.