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Dikes can be breached by different mechanisms.
 Fail mechanisms. There are four important failure mechanisms for dike rings:
| Overflow and overtopping |
The water level or the waves are higher than the top part of the dike. The water flows over the dike causing erosion of the land side of the dike. |
| Damage to revetment |
The outer protection layer of the dike on the water side becomes damaged by the waves. After that part of the dike is washed away. |
| Sliding of inner slope |
The land side of the dike becomes unstable and subsides. |
| Piping |
Water seeps under the dike creating channels which undermine it. |
If you want to know more about breaching of dikes look here.
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