I am surprised that none of ...

Published by

I am surprised that none of the comments reference applying river bank erosion models.  There are several that can provide an estimate strictly from the soils characteristics and the streams morphology. Cross sections can now be obtained from Lidar high sensitivity readings and soils data is readily available in the web. If the data is for a project, such as a bridge or retaining wall, then some field data is needed to calibrate the models. Check on Google and you will find many references to river bank erosion models.