I have two rasters: a flood inundation raster (depth grid) and a census grid. I would like to know how many people are affected at 0-1 feet, 1-3 feet, 3-6 feet, 6-9 feet, and more than 9 feet. I need to figure out how many are effected in each class (a count). What tool(s) do I need to use? Do I need to convert one (or both) rasters to a polygon? Thanks in advance!