Key:lock:leave empty

To be used when a lock is marked as to be left empty (or full) on departure.

• lock:leave_empty=yes (when lock is to be left empty on departure. This is often the case when livestock have access to the water, or the lock is a turf lock)
• lock:leave_empty=leave_full (when the lock must be left full on departure)
• lock:leave_empty=no (when the water level of the lock is to be left in whatever state it is currently in on departure)