[Tagging] Use of oneway=yes on waterways

[LeTopographeFou]

Hi

According to the waterway=stream wiki page 
(http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dstream):

    /If a flow exists, the direction of the way must be downstream (i.e.
    the way direction follows the flow)/

As of today there is a very small percentage of streams (17593 ways 
according to taginfo, 0.23%) with oneway=yes.

Is there any undocumented purpose? Is it ok and safe to delete 
oneway=yes tags for streams?

The same question can apply to drains, ditches, canals...

Yours,


-- 
LeTopographeFou

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