[Tagging] Witch tag should I use? (flood reservoir)

[fly]

Hey László

Have a look at boundary=protected_area [1].
In your case it would be  protect_class=15

See also [2].

Cheers
fly

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[1] https://wiki.openstreetmap.org/wiki/Tag:boundary=protected_area
[2] http://lists.openstreetmap.org/pipermail/tagging/2013-June/013661.html

On 06.08.2013 10:56, László Csatlós wrote:

> There is a landuse=farmland next to a river and a dam between them.
> Occasionally (probably 5-10 years) when the level of the river is
> extremely high, professionals open the dam and water floods the entire
> farmland, instead of the threatened settlements.
> This area is officially designated for this purpose, but it is allowed
> to use as farmland normally.  I can't find any tags for mark this
> secondary function. What should I use for this?