I am trying to replicate a flow length calculation in arcmap 10.2. I have an elevation raster with a pixel range from 0 to 3038.96m (32 bit). When I run the flow direction calculation, the pixel range drops to 0-255 (8 bit). I must be losing information that will affect my flow length calculation (I have a flow length calculation that has been completed that I'm trying to match)--how do I prevent this? I've tried searching in environment settings but I haven't found how to change my pixel range.
I'm fairly new to GIS.