[Tagging] Irrigation: ditches, canals and drains

[Mateusz Konieczny]

31 May 2019, 12:26 by pla16021 at gmail.com:

> Example of the horrors of using canal for a leat with current carto:
> https://www.openstreetmap.org/way/609805692#map=16/52.0804/-4.6799 <https://www.openstreetmap.org/way/609805692#map=16/52.0804/-4.6799>
> At z=19 it's actually close to the true width of the leat.
>
is usage=headrace sufficient to describe it as a leat? IMHO not

Based on https://wiki.openstreetmap.org/wiki/Tag:usage=headrace <https://wiki.openstreetmap.org/wiki/Tag:usage=headrace>
it seems that usage=headrace has no uniform size size -
https://wiki.openstreetmap.org/wiki/File:Canal_EDF_Oraison_5.jpg <https://wiki.openstreetmap.org/wiki/File:Canal_EDF_Oraison_5.jpg>
and
https://wiki.openstreetmap.org/wiki/File:SBB_Historic_-_F_103_00003_01_015_-_Zulaufstollen_Kraftwerk_Amsteg,_Auskleidung_der_Kreisprofilstrecke_small.jpg <https://wiki.openstreetmap.org/wiki/File:SBB_Historic_-_F_103_00003_01_015_-_Zulaufstollen_Kraftwerk_Amsteg,_Auskleidung_der_Kreisprofilstrecke_small.jpg>
are both among examples, with drastic size differences.

I think that in this case, with only

usage=headrace
waterway=canal

tags even a perfect renderer would have a trouble.
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