|man_made = groyne|
|A rigid structure built from a shoreline or riverbank that interrupts water flow and limits the movement of sediment|
|Rendering in OSM Carto|
|Group: Man made|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
Use the man_made=groyne tag to mark a groyne (spelled groin in American English), which is a rigid structure stretching out a short distance from the shoreline or riverbank for the purpose of reducing the movement of sediment (eg sand and gravel) or sometimes to reduce ice-jamming.
Not to be confused with man_made=breakwater, which is used for structures designed primarily to create an area of calm water for mooring boats, or with man_made=pier, which is used for structures on which people walk over water to access boats or similar.
Another name for this structure is wing dam.
How to map
Alternatively, create a sequence of linked ways with one or more additional tags on each section. For example:
- submerged=yes - for the parts always submerged.
- tidal=yes - for the parts submerged on high tide and above water on low tide.
- height=* - height over seabed.