Locks are only needed when the ships need to be raised and lowered in altitude because of the terrain the canal crosses.
No. Most, but not all, other canals have canal locks. Most canals are not built on flat land. Another without locks is the Corinth Canal.
no
Locks work by taking the advantage of water running down hill. The water is raised by closing the downstream pipe, filling up the box. Anything floating in the box will raise. Closing the upstream...
There are 3. Does anyone what there names are?