Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
An underground water tank is a reinforced concrete tank built below ground to store drinking water, pumped to a roof tank or the network. It needs watertight concrete, an internal lining approved for potable water, external waterproofing against groundwater, and an access hatch and vent.
Why it matters on a project
Leaks lose water or let pollution in from the soil. Placing it away from the septic tank and drains is a basic health requirement.
Measurement and pricing
Excavation and concrete in cubic metres, steel in tonnes, internal and external waterproofing in square metres, hatches and ladders by number.
Common mistake
Using an internal coating not approved for drinking water, or placing the tank near the septic tank.
Frequently asked questions
What tank size suits a villa?
It depends on occupants and supply regularity, set by the plumbing designer.
How often should the tank be cleaned?
Once or twice a year with an inspection.
Related terms
- WaterproofingLayers preventing water ingress into structural elements or spaces, such as bituminous membranes and cementitious coatings.
- Construction jointWhere a pour stops and resumes within one concrete member.
- Septic tankA pit or tank collecting wastewater where there is no sewer.
- Concrete admixturesChemicals added to concrete to improve its properties.
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