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Bathtub Effect

If underground tanks are installed in an area which consists of dense clay or other soil that does not allow water to readily pass through it, surface water that enters the excavation cannot easily escape by seeping through the side walls of the excavation. As a result, water tends to accumulate in the excavation and remain there.

The accumulation of water in the hole can cause the tanks to seek to float. This circumstance is sometimes referred to as the bathtub effect.