[Thor]

I observed said behavior at another study case as well. In both study cases there is (almost) no flow through the breach since the terrain elevation in the inundation area is close to the water level in the canal.

I still don’t understand why the water level in the reservoir is rising (in the second case it more than doubles over 11 hours!). Shouldn’t the water just stay at the same level in the reservoir when there is no outflow? The Hydrograph shows an enormous negativ flow after staying at about zero for a few hours.

[Thor]

Hello cameron,

thank you for the hint! Do you know of any tutorial/documentation/blog post where modeling of a drainage system is covered or which would be the right keywords to search for it in the Hec-RAS world?

Cheers

[Thor]

Thank you very much!

After solving a problem with the SA/2D connection between the two 2D areas it worked fine. After a first comparison there is almost no difference between modeling the canal as 2D or SA.

If the run time is the only advantage of using 1D modeling for the canal I don’t see any since the run time in my case still is just 1-2 minutes and the creation of the model data is way faster.

What are the “must-dos” for modeling an urban environment in the 2D area besides to reference the buildings in the terrain layer and having land use data for Manning’s n?

[Author]

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