User Forum of Software BASEMENT

wasserbändiger

User

Registered: 2026-07-28

Posts: 1

Bridge and Culvert Modelling in BASEMENT v4.2

Hi Everyone

I'm having problems with my model using BASEHPC:

I'm facing the problem, that when modelling bridges and large culverts with h-Q relations (linked boundaries) i have big differences in the upstream and downstream water depth. This is to be expected with "no_momentum" but i also tried the other types.

While this wouldn't be as big of a problem for one linked boundary, in my model domain i have multiple in short succession occurring bridges/culverts, resulting in a really strange longitudinal water surface elevation profile along the river.

Regarding mesh quality: i have a really high resolution DEM, i implemented max_area of my cells at and around the boundary at 0.1 or 0.2. So this shouldn't be the problem.

For h-Q i used normal depth flow calculations, which are obviously quite sensitive to chosen slope and roughness value....

Is there a "BEST" approach to minimize or even eliminate these jumps in water depth/water surface elevation?

And what is the best way to implement h-Q relations when using BASEHPC? Like sort of a checklist on important things when creating the h-Q relations.

*EDIT:
In BASEMD there's the Gate boundary, why is this not implemented in BASEHPC?

Last edited by wasserbändiger (2026-08-03 07:45:28)