1

For every cross-section profile, Manning's value is assigned.

There are numerous values in a single cross-section profile but HEC-RAS allows only 20 values per cross-section.

How can I deal with this problem?

2

You only need to input a manning's n value where there is a change. For example the picture below shows a cross section using three manning's n values, but well over three coordinate points.

enter image description here

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