the water level would sink. Anything that sinks into the water would cause the water level to sink
down
A store of water that can be relesed when the level in the canal has dropped due to leakage or evaporation
As the ship sinks, the water begins filling it up, so the water level would go down. The way the water level could go up is if you increase the displacement of the ship; however, by springing a leak, you effectively decrease it.
The bottom
This depends on the dissolved materials.
There are no locks in the Suez Canal as it connects two bodies of water that are at the same level
Both use a levee system requiring water to fill to raise the boat to the height necessary for the next canal or in Panama to the level of sea water.
Using reservoirs (lodges) and lock gates to maintain a water level in a canal, means that boats can travel on the canal in all but the winter, when the canal may be iced over. On a river, the water level depends on rainfall, and could become too shallow during the summer.
Locks, they are needed in any canal that is not entirely level and divide it into level sections thus acting as "water elevators" for ships raising or lowering them between these sections.
Locks are necessary to lift barges and canal narrow boats up or down through a series of lock gates. The water level at the start of a series of lock gates may be higher or lower than the water level at the other end of the lock gates. Without the retaining effect of lock gates, the canal would simply be dry in some lengths and wet in others.
a 'lock'
Locks on canals exist because you need level water to be able to boat, sail or barge from one point to another. Unlike a road, a river or a canal cannot have a hill. Hills on water are called rapids or even worse waterfalls. The Erie Canal was and still is a man made river and it was made to facilitate boat and barge traffic between Lake Erie and the Hudson River. To build the canal, labors dug a hole in the ground that was about 4 feet deep, 20 feet wide and 365 miles long! The topography between these 2 spots goes from 0 feet above sea level to 420 feet above sea level by Rome NY, then drops to 363 ft around Rochester and then up to 565 ft by Lake Erie. So imagine what would happen if they started to fill the canal with water in Rome NY? All the water would flow out to either Albany or Rochester, until there was no more water in the canal, making it impossible for ships or barges to use the canal. And this is because water seeks its own level or said another way, water always flows down hill. And it's this property of water that forces man made rivers to have locks. So what a lock does is create steps in the canal to step down to the level below or if traveling in the opposite direction step up to the level above. So the locks were built to allow boat and barges to sail up hill and down hill on a flat body of water!
It provides a method of raising and lowering boats to match the water level without having 'water falls' involved.