Help! Not sure how to cut the cross sections in this situation?

[sunshine123]

Hello,

I’m creating a HEC-RAS model for a project now which aims to improve the bridge which the river crosses. I know that HEC-RAS model won’t allow overlapping cross sections. Now I’m not sure how to draw the cross section 8,7,6,5, and 4, to make sure they can model the bridge without overlapping each other. Also, another question, is it ok to draw a cross section crossing the roadway?

Any help will be appreciated!

[Lonnie A]

A quick way to help guide proper XS layout is to put a simple 2D model together of the area if you have the topo that you can put into a terrain file for RAS. You can run the model and by reviewing the flow tracings as a guide. The other useful tool is to plot the WSE contours from the resulting 2D run and the XS should roughly parallel those.

[Lonnie A]

A quick way to help guide proper XS layout is to put a simple 2D model together of the area if you have the topo that you can put into a terrain file for RAS. You can run the model and use the flow tracings as a guide. The other useful tool is to plot the WSE contours from the resulting 2D run and the XS should roughly parallel those. The 2D doesn’t have to be overly complicated and you can run artificial flow as you are only using it to see the conveyance pattern vs trying to compute a true WSE.

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