Locks work in canals too starts and they mainly revolve around sea level. Sea level basically levels out the difference between the next gate way to the ocean and the sea level you are in while passing through a lock.
To alert a river lock attendant that you wish to go through the lock, you usually sound your horn or whistle in a specific sequence as defined by the lock operation rules. Typically, this involves a series of long and short blasts to communicate your intention to pass through the lock.
One long blast on the boat's horn or whistle indicates to the river lock attendant that you wish to go through the lock.
The Gomti River passes through Lucknow.
what river that passes through zaragoza?
The Geum River (Silk River) is in South Korea.
Yes
it is in spain
built for ships to pass through
snake river pass
Danube
Paris, London,
No.