Why supporting wall of a dam is built very broad at the bottom?

Why supporting wall of a dam is built very broad at the bottom?
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The supporting wall of a dam is built very broad at the bottom because at bottom the water pressure is very large as compared to the surface of water.
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The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall (1) depends on the thickness of the wall (2) increases with height of the wall (3) increases with depth of the wall (4) depends on the area of the wall

Description : The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall (1) depends on the thickness of the wall (2) increases with height of the wall (3) increases with depth of the wall (4) depends on the area of the wall

Last Answer :  increases with depth of the wall

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The wall of a dam is broader at the base (1) because streamlining is required (2) to withstand pressure that increases with depth (3) to withstand pressure that increases in a horizontal plane (4) to withstand pressure that is increased with atmospheric pressure

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Last Answer : (2) to withstand pressure that increases with depth Explanation: Darns are built broader at the base for two reasons. The first is because it needs to be stable enough to support the dam, and two, ... the structure the lower levels of water are at higher pressure than the upper levels of the water.

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Last Answer : (2) to withstand pressure that increases with depth Explanation: Darns are built broader at the base for two reasons. The first is because it needs to be stable enough to support the dam, and two, ... the structure the lower levels of water are at higher pressure than the upper levels of the water.

The stability of a dam is checked for (A) Tension at the base (B) Overturning of the wall or dam (C) Sliding of the wall or dam (D) All of these

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The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid) (A) wH/2(B) wH (C) wH2 /2 (D) wH2 /4

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