I walk past one everyday on the way to work, one day the middle of the locks is full of water, other days it’s not. How do they work? Is someone adjusting them every day or so? How do boats get through?
In: 5
If you are a barge coming through and you want to go up the lock, you adjust the water (by opening the lower gate) so the lock is empty, drive in, shut the gate and let water in to raise the level then open the top gate and drive out.
You do this in reverse to go down a lock.
The days you see them full someone has gone up through them recently, the days they are low someone has gone down them
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