Hi, I have actually posted a previous topic about this query, but I don't think I was very clear about what I was trying to do so thought I would try again explaining it a bit more clearly. I have a flood depth map for my modelled reach. Is there a way of ascertaining what the maximum flood depth value is by material type? I.e. What is the max flood depth in the area property polygon 'floodplain'/'channel' etc... Thanks, Tim