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layer tag

I came across some weirs which had a layer=1- or layer=-2. Did not find any defined meaning of this combination? RicoZ (talk) 22:33, 30 October 2013 (UTC)

Direction of way

Is it really necessary to take care for the direction of the way, as suggested here: "Like a natural=cliff the line direction matters: On the left side there is the high side, on the right side is the lower side." IMHO we do not need this because the direction of the waterway is already indicating the high and low part, or am I missing something? --Dieterdreist (talk) 10:37, 21 February 2017 (UTC)

In practice I many mappers got it, also in waterway=dam which could be considered somewhat analogous nothing like this is mentioned. But in theory I find it a good idea, a dam or weir is somewhat analogous to an embankment or waterfall and just because there is the theoretical possibility to get the information in some other way does not mean it should not be specified explicitly. Also linear weirs should be used in combination with water areas and there it is rather common that someone draws the water area but forgets the waterway and in this case you could use the explicit direction of the weir. RicoZ (talk) 22:12, 21 February 2017 (UTC)