Flooding module and culverts

Christian Bouman · March 2019

I try to fill a system of small canals with use of inlets upstream and a breach downstream. The attributes are shown below:

Inlets

Inlet capacity: 1000000 m3
Inlet Q: 10 m3/s
Upper threshold: top of the canal profile
Lower threshold: bottom of the canal
For the breach I use the canal bottom level as breach level, the width of the canal is the breach width. I used an external water level of 0,5 m above the canal bottom.

Breaches

Breach height: bottom of the canal
Breach width: width of the canal
Breach angle: ?
External surface level: bottom of the canal
External water level: bottom of the canal +1 m
External area: 1000000

When I run the module, water flows around my inlet and breaches in the canals but only in the most nearby section. Canal sections connected with culverts are not filled.

I already tried the following for the culverts:

Adjust the diameters
Set the culvert height at the bottom of the connected canals (highest as reference)

What is happening around the culverts? And how can I prepare my project to make water flow better through the system?

Godelief · April 2019

Hi Christian,

So if I understand correctly, there is now water flowing through the culverts?
Can you give me some more information about your project, for example:

Have you imported water areas? This is an important step.
Are the start and end points of the (line-based) culverts in a ditch/canal? It is important that they are in a water body and not start or end on land for example.
Do the culverts where no water is flowing through, have an Attribute: ObjectFlowOutput?

If you can provide more information, I'm able to answer your questions better.

Flooding module and culverts

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