The Enforce Streams menu option is designed to utilise watercourse information to aid in the hydrologic treatment of existing DEMs. This algorithm attempts to ensure that pixel elevations do not flatten or increase in a downstream direction along the stream alignments. If a section of flat or rising terrain is encountered along a stream alignment then the algorithm will search for the first lower pixel along the stream alignment and then apply linear interpolation along the stream segment to assign a downhill slope across the flat or rising section of the flow network. The algorithm is explained in more detail in the Hydrologic Conditioning section.
