Everyone seems to be talking about relative water surface elevation lately, but I can't seem to come up with the correct search terms to find out more on how it is done. I get the basic idea that you subtract a grid of elevations of stream course from the overlying land surface elevation and you get a grid that should show you where the stream might be able to break through to create a new stream path. But how to you extrapolate the elevation of a stream out under the stream banks appropriately? Is the same elevation from the stream always appropriate all along a line perpendicular to the stream? And what do you do in stream meanders where the perpendiculars intersect?
Is the subject that I want to search for HAWS, for Height above Water Surface?
