way with temporary stream

Namaste dear friends.
In mountains we have frequently the situation where the way and temporary (during rain period) one stream are in fact the same way. We had discussion about in german forum.

The result of discussion is- we use tag: http://wiki.openstreetmap.org/wiki/Key:intermittent with tagging of path or footway together as one line.
For instance:
highway=path
waterway=stream
intermittend=yes