This is my first stop within the GIS community to obtain a process to generate depth grids from high water marks, which will be followed by extensive research on best avaiable practices. I have a series of points, with elevation from gathered high water marks, and a fairly decent DEM of the area. Is anyone aware of the processes/tools within ArcMap to follow and generate a fairly defensible product. I understand I will have to evaluate the parameters, I just was seeking the processing steps (interpolation/raster calculator) necessary to acheive this goal. Thank you!!!