inernal outlet in 2d area

[Lluis Gorgorio]

Greetings to all,

Apologies for my bad English.

I am modeling a small area in HEC RAS 2d. In addition to the boundary conditions for the “regular” entrances and exits of zone 2d, this 2d area includes in its interior the inlet of a very long culvert that empties outside the study zone. I can calculate or estimate the elevation-drainage flow curve for this culvert. My question is: how can I model an outlet or a sink inside a 2d area with HEC RAS?

Thank you.

[Luis Partida]

Use a pump that replicates the culverts efficiency

[Lluis Gorgorio]

Thank you very much Luis. Much appreciated. any other ideas?

[Luis Partida]

The other option is too extend your 2D mesh outside of the study area such that you can add a culvert and actually send it away from your focus region

[Lluis Gorgorio]

Thank you very much Luis. It is possible to join two 2d non-contiguous areas with a culvert?

[danielsinivirta]

You can have 2 different 2D meshes but I think it should be contiguous. If the exit of this culvert is out of your mesh, so just the entrance is relevant to your model, you could extend your mesh long enough to put the culvert’s exit so that it doesn’t affect your interest area and maybe add another boundary condition for the flow to get out and have a proper water balance account.

[ckatsoulas]

You can add a new small 2d area adjacent to the main 2D area for the outlet to the culvert. Modify the terrain of the 2nd 2d area so it is below the culvert outlet and add boundary condition to it. You can then connect the culvert from the main 2d area to the 2nd 2d area. Be careful how you locate the 2nd 2d area as you cant place it adjacent to a boundary condition face of the main 2d area. I have tested this and it works great.

[Author]

Posts