why are the walls of a dam thickened near the base class 8
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The first is because it needs to be stable enough to support the dam, and two, the bottom of the dam needs to be able to deal with the increased pressure of the water, as you get further down. Water pressure is greater at the base than the surface
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The wall of a dam is broad at its base. The reason behind this is, pressure exerted by the liquid increases with increase in depth. The dam contains huge amount of water and as we go deep the pressure exerted by such a huge amount of water increases to very high
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