The pressure sensor is placed at the bottom of the tank and measures the hydrostatic pressure which is directly proportional to the water level, for example 100mbar~1 metre of water.
We can use a pressure measurement device to measure the volume of water in an underground tank. To use a Polyethylene water tank underground the tank has to be moulded in a certain way with strong ribs and interior voids to make it possible for it to be used under the extra loads it experiences. As pure water at 4 oC has a Specific Gravity (S.G.) of 1, the tank requires a higher S.G., for example 2.1. Underground tanks therefore need a special design to cater for these pressures. Underground tanks are very suitable for locations which are short on space but rainwater tanks used underground have to be strong enough to withstand both the outward pressure from the water stored inside the tank (internal hydrostatic pressure), above ground pressure (exerted by the surrounding soil, driveway or slab for example) and hydrostatic lift caused by upwards pressure of groundwater if it is present. Slimline tanks, being taller, need special design features to help resist the pressure of the water inside the tanks. Basically the taller the tank, the higher the pressure on tank walls, one reason why wide diameter squat round tanks are so strong. The tank walls have to be constructed to resist this pressure under all conditions and at all levels of water storage.
It can be simply defined as the pressure coming from the weight of the water and its value as determined by the height of the liquid container and the density of the liquid. Hydrostatic pressure is an issue for all tanks. However, some manufacturers are prepared to have the bases of their tanks dug into the ground to a very limited degree and subject to an independent engineering assessment. Customers sometimes ask, “ Can I put the above ground tank underground?”.Ībove ground tanks are designed only to deal with the normal pressure of gravity and the corresponding outward pressure of water stored inside the tank (internal hydrostatic pressure), so they are never to be used underground.
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