Swimming Pool Construction and Ground Movement

One of the main threats to a swimming pool is ground movement, which can be classified as simple settlement, minor seismic tremors or (in rarer cases) earthquakes. In the first case, everything remains more or less normal: small movements are absorbed by the structures, and the stresses are never strong enough to compromise the pool’s efficiency. However, if these movements increase in intensity, the situation becomes more complicated. Obviously, in the event of major tremors, other concerns take precedence, but factoring this possibility into the design phase can prevent the need for costly subsequent repairs.

A seismic swarm or an earthquake is simply a tremor of the ground, whether mild or severe, which can occur for a myriad of reasons. Depending on its magnitude and origin, it can cause shifts in the Earth’s crust, landslides, and even more extreme consequences such as tsunamis or volcanic eruptions. Ground movements are not solely linked to these factors; there are others: volcanic eruptions, sediment accumulations caused by landslides down a mountainside, cave-ins, changes in river courses, or even, quite simply, a sudden change in atmospheric pressure.
All these phenomena usually result in low-magnitude events, generally classified as microseismic events, i.e. tremors detectable only by instruments. Tremors of this kind occur constantly, although we are not aware of them. However, if the intensity increases, these movements can cause cracks and fissures in the swimming pool basin. Numerous events of this kind are recorded in Europe every year and, although they are not obvious at first glance – and in many cases are not even mentioned – the consequences are very much visible in our homes.

In cases such as these, problems can arise in the construction of the swimming pool due to ground movements: in a very short time, it risks becoming riddled with cracks, leaking water significantly and becoming almost impossible to repair.