Water tanks can either be designed for use above ground or underground. Water tanks that are designed for underground use are made to resist internal and external hydrostatic pressure. They will need to reach a number of requirements before they are installed.
Hydrostatic pressure is as explained as what a liquid exerts when it is its resting phase. The pressure that comes from the weight of the liquid or water has a value that is determined from the density of the water and the height of the container.
The water tank needs to be constructed in a way that it will be able to resist the pressure exerted in all types of conditions. When a tank is tall, the pressure is higher. Therefore shorter tanks which are wider in their diameters are stronger than taller tanks.
Underground water tanks are made out of a polyethylene material which is durable and strong. This material is able to resist the pressure from above the ground as well as the hydrostatic pressure internally.
The pressure that comes from above ground is usually caused from factors such as driveways, slabs and the surrounding soil. Additionally there is an upward pressure present from groundwater. This is the reason for the special design of these water tanks to withstand all these types of pressures exerted.
The polyethylene material used for water tanks are designed in a specific way. The interior walls of the tank will be incredibly strong with added ribs and voids. All these added designs ensure that the water tank used for underground use can withstand enormous amounts of pressure caused from hydrostatic pressure on the inside and the outside. Even storm water and excessive rain will not have an effect on these tanks.