Pressure in liquids

The dam is much thicker at the bottom than it is at the top because the pressure of the water is much greater deeper down.
1. Pressure in a liquid increases with depth
2. Pressure in a liquid acts equally in all directions
3. The greater the density of the liquid, the greater the pressure at a certain depth.

Pressure at a depth h in a liquid = g x depth (h) x density of liquid (r)
(g is the acceleration due to gravity (10m/s²)