Underground Water Tank (UGT)
A below-ground storage tank, usually the building's primary water store, filled from the mains and pumped to the overhead tank.
On an actual building
It is loaded from both directions — stored water pushing out and groundwater pushing in. Treating only the inside leaves the external head unresolved, and for potable storage ingress is a health issue.
What we most often have to correct
That an internal lining fixes contamination. If groundwater is entering, the external side has to be addressed too.
Terms that come up alongside this one
- Overhead Water Tank (OHWT)
An elevated storage tank, usually at terrace level, feeding the building by gravity..
- Hydrostatic Pressure
The pressure exerted by standing water against a structure, increasing with depth below the water level..
- Food Grade / Potable Certification
Certification that a lining material is safe for contact with drinking water, issued against a recognised standard and valid for a stated period..
More building elements terms
Underground Water Tank (UGT) — questions we get asked
What does underground water tank (ugt) mean in waterproofing?
A below-ground storage tank, usually the building's primary water store, filled from the mains and pumped to the overhead tank.
Why does underground water tank (ugt) matter on a real project?
It is loaded from both directions — stored water pushing out and groundwater pushing in. Treating only the inside leaves the external head unresolved, and for potable storage ingress is a health issue.
What do people commonly get wrong about underground water tank (ugt)?
That an internal lining fixes contamination. If groundwater is entering, the external side has to be addressed too.
Have a building showing this?
If a term on this page describes something you are looking at, a site inspection will tell you how far it has gone and what it needs. It costs nothing.
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