In the United States, this is usually defined as the "X years floodplain", indicating how frequently it's expected to flood. For example, the 100-year floodplain is the area around a river is the area that's expected to flood an average of once every hundred years.
-- Mark On Sun, 25 Sep 2016 12:48:10 +0200 Colin Smale <[email protected]> wrote: > Where would the boundary be? How could we describe it objectively? In > low lying areas such as the Netherlands there are sometimes so called > winter dykes which give a sharp edge to the flood plain. Otherwise it > would all be a bit vague around the edges. //colin > > On 25 September 2016 12:30:50 CEST, Warin <[email protected]> > wrote: > >Hi, > > > >There is a draft to tag floodplains using the key natural. > > > > > >http://wiki.openstreetmap.org/wiki/Proposed_features/floodplain > > > > > >My thinking is that this would lead to conflicts with other > >'natural' tags .. like natural=scrub than may be applied to the same > >area. > > > > > >So .. what would be the best key to use for this feature/value? > > > >I am thinking that as it is associated with a waterway (it must start > >to > >flood from somewhere and that is usually a waterway) that the key > >waterway should be used. It would have rendering similar to a lake - > >but > >'intermittent' so dashed lines rather than a solid colour. > > > > > >Thoughts? > > > > > >{There is presently flooding in some areas of Australia, why my > >thoughts > >have turned to this. All too soon it will turn to bushfires} > > > > > >_______________________________________________ > >Tagging mailing list > >[email protected] > >https://lists.openstreetmap.org/listinfo/tagging _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
