Welcome to the County of Berks
How A Lock Work
How a Lock Works
Boat Going Downstream

Boat enters the lock; gate closes behind it
Boat enters the lock; gate
closes behind it.

Water is released downstream; water level lowers in the lock.
Water is released downstream; water level lowers in the lock.

When the water level is low enough, the gate opens and the boat leaves the lock.
When the water level is low enough, the gate opens and the boat leaves the lock.

Boat Going Upstream

Boat enters the lock; gate closes behind it.
Boat enters the lock; gate closes behind it.

Water enters from upstream; water level rises in the lock.
Water enters from upstream; water level rises in the lock.

When the water level is high enough, the gate opens and the boat leaves the lock.
When the water level is high enough, the gate opens and the boat leaves the lock.