Levee
Levee
Levee
A dam is a structure built across the water to hold water back.
they built huge walls
They constructed buildings from huge stones, built walls to hold soil and canals to carry water. They made metalwork and they produced gold and silver jewelery.
A large amount of water that has built up under the ground is called an aquifer. Aquifers are underground layers of rock or sediment that hold and transmit water. They are an important source of freshwater for many regions around the world.
A wall built to prevent flooding is typically called a flood barrier or a flood defense wall. These walls are designed to hold back rising water levels and protect properties and infrastructure from flood damage.
Dam
Levee
to hold the water better but at the top it's thinner to get water in
They are designed to hold back alot of water.
It depends on the depth of the water. The hydrostatic pressure increases with depth.