what kind Effect do tsunamis have on infrastructure?

Answer 1

When the sheer force of a incoming tsunami obliterates everything in its path, it also clears away roads and railways, hampering rescue efforts. In addition, the torrential water deluging entire hectares prevent helicopters from landing.
Normal rescue launches and boats would also be unable to withstand the impact of the tsunami, and could be sunk or smashed into pieces by the walls of water.
The huge mass of water also broke sewage and water pipes, contaminating water and food sources.

Answer 2

If a major tsunami hits--there is no infrastructure afterward.

Answer 3

they flatten electric systems ,fill drains with mud and block them
flood sewage systems that then mix with water on the surface
push over buildings that are not strong enough break bridges .remove sand from beaches .break trees
and probable shift some foundations of buildings

Answer 4

if they're big enough, they destroy it.