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Cutting topographic data below a polyline

Question asked by Clymene1 on Sep 15, 2016
Latest reply on Sep 22, 2016 by Clymene1

Context: I want to cut  *.xyz data for a river channel below the free surface. 


I assume I want to use ArcGIS to generate a polyline based on my free surface data, and to clip out all topographic data that exceeds it. However, this isn't a method I've used before and it's been a long time since I've used ArcGIS. I've not found a method online either. Does anyone know where I could start, or what tools would be applicable?


Thanks in advance!