Question

why dams have broader base

Answer 1

Dams have Broader Base. The reason is that the pressure exerted by a liquid increases with its depth. Thus, as the depth increases, more and more pressure is exerted by water on the wall of the dam. A thicker wall is required to withstand greater pressure, therefore, the thickness of the dam increases towards the bottom.

Hope dis helps u..

Answer 2

A deep dam experiences huge amount of pressure at the bottom. To withstand the greater water pressure  at the bottom, the lower portion of the dam is made very broad.