[Tagging] waterway=wadi problem

[Wolfgang Zenker]

* Mateusz Konieczny <matkoniecz at gmail.com> [150114 15:45]:
> waterway=wadi is used (18 180 times) and has some support (for example JOSM
> and default map style).

> During implementing rendering of intermittent=yes I discovered major
> problem with this tag -
> the same waterway=wadi may be used for completely dried up waterway,
> intermittent stream, intermittent major river and intermittent ditch.

> Therefore - it seems that using waterway=river/canal/stream/ditch/drain +
> intermittent=yes is clearly superior to using waterway=wadi.

In my experience a wadi will go from "completely dried up waterway" or
"small stream" to a raging river within a few seconds after some
rainfall upstream, and back to its former self within a few hours.
Depending on the location, these rainfall events might very well be
a few years apart. When I tag an "intermittent stream" I usually
have something more benign in mind, like a stream that only exists
during the spring snow melt and is dry the rest of the year, but
maybe that is only my interpretation of an intermittent stream.

Wolfgang