[user]

I’m not sure why , but you should be able to see a line linking both upstream and downstream to ensure that its actually connected . Perhaps it would be better if you can provide some images or the files you are working on .

[user]

One workaround is to connect both cross sections using a lateral structure with low weir coefficient to simulate flow across both cross section in the event of over topping.

[user]

In my case , my cross sections always turn out straight or based on the cutline I drawn on DEM. The only time my cross section zigzag is when I deal with data points from field survey . Sometimes my exported cross section doesn’t turn up in the correct position , so I have to adjust them through XS cut line table .

[user]

If thats the case , you should use the datum adjustment in HEC-RAS to correct the elevations manually. Normally you should able to obtain the same cross section before and after export.

[user]

It seems odd that you have some water outside your bounding polygon. Have you verified that your cross sections are placed correctly ?

[user]

Did you try exporting the cross section one by one and see whether do they align nicely?

[user]

Is your elevations correct before exporting ? You could view your cross section before exporting it . Another note is make sure you digitise your cross section left to right facing downstream .

[user]

I’m not familiar with AutoCad Civil3D , but you should be able to export your streamline and cross section as .geo file to be imported into Hec-Ras. There are several issues that cause your streamline to not be exported properly . Another workaround is to “redraw” your streamline either through Hec-Ras or external GIS programs.

[user]

One way is to import your cross section in CSV format. Make sure you specify your River, Reach , RS , X , Y and Z values.

[Author]

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