The diagram demonstrates the operation of a canal lock, which facilitates the movement of boats and ships between different water levels. This process is divided into four primary stages.
The lock is equipped with a front gate and a back gate, both of which can be adjusted based on the direction in which the boat is traveling.
In the first stage, the boat approaches from the lower water level and enters the lock chamber. Once the boat is positioned inside, the back gate closes, sealing the chamber and preventing water from flowing out.
Next, the front gate, connected to the higher water level, opens, allowing water to flow into the chamber. This raises the water level inside the lock until it matches the higher level outside. Once the water levels are equal, the front gate is released.
In the final stage, the boat is able to exit the lock and continue its journey along the canal.