A dam for water reservoir is built whicker at the bottom than at the top because:

Options

A. pressure of water Is very large at the bottom due to Its large depth
B. pressure of water Is very small at the bottom due to its large depth
C. It Is a custom
D. It Is due to surtace tension of water

Answer

A

Explanation

With Increase in depth the gauge pressure Increases (as p `prop` h) and so the force perpendicular to wall of dam also Increase, i.e. dam must have greater strength at base than at top. This Is why dam are made thicker at the base than at the top.