It Was Not Easy to Build a Canal!
Canals are artificial waterways. They need to be filled with water. Every time a boat passes through a lock thousands of gallons of water pass from the higher level to the lower level. The highest point has to be regularly topped up. Finding ways to supply the summit (the highest point) was always a problem.
Even with the permission of Parliament, landowners who objected to the canal passing through their land could cause a lot of obstacles. Land had to be bought for the canal and the talks were often difficult. Some landowners wanted to prevent the canal from being built or to obtain a very high price if they could.