In Standard handbook for civil engineers, ed. Old man river. The problem with dams. NW 2nd Ave. A cubic foot of fresh water weighs 62.4 pounds.
Water weighs more than a heavy wood such as oak, but half as much as bricks.
The point is, of course, that as the elevation of water behind a dam is increased, the height and density of it causes high pressure at the bottom of the dam. In this activity, you will observe what happens to the flow of water when it is under pressure. Cover the holes with adhesive tape. Punch three holes diagonally in the side of another can. Cover the holes with adhesive tape.