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.
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