Initial Water Level in 2D Flow Areas

[PDistle]

Hello!

As stated before, I have a model with 2 different 2D Flow Areas that are connected via bridge.

I want to run the model with a certain initial water level in the upstream flow area, while the downstream flow area should start dry. The downstream flow area has some regions that are elevated below 0 masl. When I start the simulation, HEC-RAS automatically starts with an WSE of 0 masl in the downstream Flow Area instead of dry. Is it possible to change this?

Best regards
Paul

[Anonymous]

If you leave the initial elevation blank, it should start dry.

Also, if you have any stage hydrograph boundaries on the downstream area, uncheck the box that says Use Initial Stage.

[PDistle]

I left the inital elevation blank and the box is also unchecked but it still starts with a WSE of 0 masl.

[Anonymous]

It could be a bug in RAS, but I have not ever had that problem.

You aren’t using a restart file, are you?

Also, if you are using an Initial Conditions time or warm up steps, water could be coming in before you get output at time = 0.

My final suggestion, you could try entering a really low WSE. For the initial WSE, try something like -1000.

[Author]

Posts