[Tagging] waterway=derelict_canal

[Daniel Koć]

When deciding about rendering change of waterway=derelict_canal on
osm-carto we are not sure what to do, because meaning of the tag is not
clear for us:

https://github.com/gravitystorm/openstreetmap-carto/issues/1003

https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dderelict_canal

What would help us is to know whether it's filled with water, is
permanently dry or have some intermittent/seasonal pattern.

What do you think is the meaning of this tag and how could this
definition be improved?


-- 
"My method is uncertain/ It's a mess but it's working" [F. Apple]