Required number of cross-section data for analysis

[RyanDunne]

How do you know how many cross-sections you need to survey for an analysis before you conduct a survey, construct a model, and interpret the results of the model?

I assume this varies greatly depending on analyses, but is there any general guidance for this?

Thank you!

[cameron]

You need to make sure you have cross-sections at grade breaks, change in cross-sections areas, change in roughness, and around bends. Below is a link that discusses a way to determine how many cross-sections based on bank full depth and slope. It is also important to make sure that the downstream boundary (assuming sub-critical flow) is far enough away to that it does not impact the area of interest.

http://hecrasmodel.blogspot.com/2008/12/samuels-equation-for-cross-section.html

[RyanDunne]

Thank you so much, I didn’t expect such a clear answer!!

Ryan

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