Hi All, I couldn’t figure out if there is a way to derive rivers from the contour lines. I tried to convert a contour to dem by using the Create Tin, tin to Raster tools. Then, I used the following tools in this order: Fill Flow direction Flow accumulation Raster calculation (setnull ("flowaccumulation",0)) Raster to polyline But… Show more
The recommended interpolation method for contour lines would be: Topo to Raster—Help | ArcGIS Desktop . You should also verify the input precision of the contour lines and the pixel size (resolution) you are using. Can you post a screenshot zooming in to a problem area of the contour lines and the resulting streams?