[Tagging] Drafting proposal: use oneway=reversible or create tag?

[moltonel]

On 7 September 2015 17:38:45 GMT+01:00, Volker Schmidt <voschix at gmail.com> wrote:
>tidal
>up to London, depending on tides (and wind). But I would be reluctant
>to
>tag the river's water flow from London downwards as flow_direction=both

Yes, rivers can be tidal without their flow reversing. The water level can rise during the rising tide but still flow toward the sea. tidal=yes is a fairly common tag.

>Also, one needs more values:
>flow_direction=forward|backward|tide_dependent|operator_controlled|...
>default value: forward

LGTM

I'd advise against any up/down value because the question normaly only arrises when the relief is fairly flat.
-- 
Vincent Dp