[Tagging] Tidal inlets / creeks

[charlie at cferrero.net]

Afternoon all,

Access to Bing imagery has vastly increased the quality of information  
available for landuse in the UAE.  There are major tracts of saltmarsh  
and mangrove wetland, e.g. here:
http://www.openstreetmap.org/?lat=24.8103&lon=54.7543&zoom=13&layers=M
(in Mapnik the coastline hasn't updated so it looks like solid land,  
but check out Osmarender or Bing to see a better picture).

It would be nice to be able to map the tidal waterways that run in  
between the mangroves and saltmarshes - particularly the manmade ones  
that have been explicitly cleared to allow marine vessels.   
Unfortunately I can't see any way of tagging a waterway that does not  
imply freshwater.  Ideally we'd have a waterway=tidal_creek or  
something like that but this doesn't seem to be in use at all.

waterway=canal might, at a stretch, work for the manmade channels, but  
not for the natural ones.

Finally, is there a way of tagging saltwater lakes (i.e. lagoons)?   
natural=water, water=saltwater?

Any suggestions?

-- 
Charlie