The canal system in England played a vital role in the time of the industrial revolution. It was a way of connecting towns and a way of transporting raw materials and products to other parts of England.
During our vacation to England last summer I visited Hatton Locks, Warwickshire. They are a flight of 21 locks which spans 3.2km of the canal
If you are not sure what is a lock, I have taken from Wikipedia “lock is a device for raising and lowering boats between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls”
The Lock gates control the water level between stages of the canal. The gates were usually made of oak.