Hi you could tag them by surroundings and on top, with 2 circular ways tagged with man-made=embankment, be shure the short lines point up and down to eachother. Tats the way a slpe is determed in technical drwaings, the length and frequency of the lines is used to figure the decline, but since we only get short ones next to eachother let it be. Like this https://www.openstreetmap.org/#map=19/52.27366/4.72674 And yes youll have to walk it 4 times for a survey. Greetz
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