This is because the pressure in a liquid increases with depth. This means that the pressure at the bottom of the dam is more. Hence it is more liable to break out from the dam as more pressure is exerted on the walls. So, the walls are thicker at the bottom.
because the water flow at the bottom of the dam is much stronger than the top
due to the high force of water coming from the up the bottom wall is constructed thickly
The bottom of the dam wall has a greater pressure against it because of the weight of water. Near the top, the pressure is less, so less need for a thick wall.
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to hold the water better but at the top it's thinner to get water in
Well man made dams like the Hoover dam can support the water from overflowing while beaver dams a just basically homes.
The pressure of the water (the weight) is greater at the bottom, due to the depth of the water. As the pressure is less near the top, the top of the dam wall doesn't need to be as thick as the bottom of the dam wall.
There were 3 TVA dams on the Tennessee River in Alabama
Bottom ones have to bear more weight
1.1 mm
beavers make dams
the air gets thinner as you get nearer the top.
electricity that is made from water-dams
i don't knowummmm how about Sand
It is made of wood which is been made thinner in process.
because gravitatinal potential energy of water is used to rotate turbines.