Why do dams have thicker walls at the bottom?

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Question

Why do dams have thicker walls at the bottom?

Accepted Answer

Because the pressure from the water is greatest at the bottom — Water pressure increases with depth (P = hρg). The base of a dam must withstand the greatest pressure, so walls are built thicker at the bottom.

Answer

To look more impressive

Answer

Because of the weight of the dam itself

Answer

Because the pressure from the water is greatest at the bottom

Answer

To reduce cost

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