Hi, Instead of digitizing left and right banks for the purpose of floodplain modeling, I am trying to create buffers around the streams and use those instead. I am creating buffers around streams and dissolving them into one buffer then converting polygon to polyline and spliting the polyline at the upstream end of each stream (If I do not split, only one bank point will be created in the cross section. I am guessing because the polyline ID is the same on either side). I then give each side on each segment a unique ID so if we have 10 streams in the watershed, I end up with 20 segments with 20