cross-section location not change after downstream reach length is changed

[Anonymous]

I used HEC-RAS several years ago, and have to follow some examples to learn how to use HEC-RAS again. One problem I met when I practiced one of the examples is that when I changed the downstream reach length of a cross-section, HEC-RAS did not re-arrange the space between two cross-sections accordingly, i.e. the location of a cross-section would not change. However, if I plot all river reaches and cross-sections from scratch, HEC-RAS does re-arrange the space between two cross-sections correctly if I change the downstream reach length of a cross-section. Does anybody know the reason for this difference? Thanks.

Stanley

[Chris G.]

If your model is georeferenced, RAS will maintain the cross section vertex coordinates for it’s position, regardless of the reach length. That could be why you are not seeing a change.

[Anonymous]

Thanks, Chris. That’s the problem.

[Author]

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