[OSM-newbies] Sand Bar

[Peter Childs]

How to I tag a Sand Bar that extends 50meters in the sea at low tide
and disappears at High Tide. Its called "The Street" and its in
Tankerton, Kent. Uk
http://www.openstreetmap.org/?minlon=0.2519539&minlat=51.2615685&maxlon=0.6075064&maxlat=51.5630983&box=yes

There is also a life guard station that I've put on the map. I'm not
sure I've got it right as its not rendering currently. I feel sure
that it should be.

Is there some way to place brake waters, onto the map, (ie wooden
structures that stop the sand/pebbles moving down the beech)

Its just I can't find anything on the wiki.

Peter.