Key:seamark:gate:category
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 seamark:gate:category
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| Description |
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Types of gates on a waterway 
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| Group: marine navigation |
| Used on these elements |
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| Requires |
| Status: in use |
| Tools for this tag |
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This key is used in conjunction with seamark:type=gate and indicates the type.
How to map
Set a node 
or draw a line 
where the gate is and add:
- seamark:type=gate
- seamark:gate:category=see table below
- seamark:gate:clearance_height=*
- seamark:gate:clearance_width=*
Values
| seamark:gate:category=* | Definition | Example | Count |
|---|---|---|---|
| flood_barrage | A flood barrier.
See also waterway=security_lock. |
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| caisson | A steel structure used for closing the entrance of locks, wet and dry docks. |
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| lock | A massive hinged door at each end of a lock. | 
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| sluice | A sliding gate or other contrivance for changing the level of a body of water by controlling the flow into or out of it.
See also waterway=sluice_gate. |
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