while constructing dams the base is more wide. why
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A dam's design must enable it to withstand greater pressure at the bottom than at the top. As a result, many dams are built in a triangular shape. A wide bottom withstands the great load of the water deep below the surface, while the top of the dam can be built thinner so as not to use unnecessary costly materials.
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Dams are used to hold large volumes of water.Since the pressure is large on the walls of the dam,a small base will cause instability and eventual disaster .
Pressure is directly proportional to area
since area is large,the pressure is easily balanced.
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