@Jakka pointed out OSM wiki tagging on: https://wiki.openstreetmap.org/wiki/NL:Wadi, 

Amended to: 
intermittent=yes
basin=infiltration
landuse=basin
note=according to https://wiki.openstreetmap.org/wiki/NL:Wadi , but ID disagrees, with thanks to @Jakka for pointing out the wiki page
