Weak showers, pressure that drops when two taps run, or water that comes out hot from the cold tap in August: most of these complaints trace back to how the tanks and pumps were designed. Here is how a good water supply system works in a UAE villa or mid-rise building.

Why buildings store water

Most buildings in Abu Dhabi do not draw directly from the mains at every tap. Water is stored in tanks and then pumped to the building. Storage covers peak demand, keeps the supply running during mains interruptions, and protects the public network from pressure drops.

Typical arrangements

• Ground or underground tank with a booster set: water is stored at ground level, and a pump set feeds the whole building at a controlled pressure. This is common in modern villas and mid-rise buildings.
• Ground tank, transfer pumps and a roof tank: pumps lift water to a roof tank, and gravity feeds the floors below. It is simple, but the top floors get low pressure, and roof tanks heat up in summer.
• Pressure zones for taller buildings: the building is split into zones, each with its own pumps or pressure-reducing valves, so the lower floors are not over-pressurised.

Getting the booster set right

• Duty and standby pumps: at least two pumps, so the supply continues when one fails or is serviced.
• Variable speed drives: pumps that match their speed to demand keep the pressure steady, use less energy and run more quietly than fixed-speed pumps.
• Pressure vessel: a small vessel stops the pumps from starting every time someone fills a glass.
• Target pressure: around 2 to 3 bar at the outlets suits most fixtures. Fit pressure-reducing valves wherever the pressure would exceed about 4 to 5 bar.
• Dry-run protection: low-level switches in the tank protect the pumps if the tank runs empty.

Dealing with the heat

In summer, cold water stored on a roof or carried in exposed pipes can reach uncomfortable temperatures. Good practice includes:

• Placing tanks in shaded or enclosed areas, or below ground.
• Using insulated tanks and insulating exposed pipework.
• Routing pipes inside the building rather than across hot roofs.
• In premium villas, adding a water chiller on the cold water supply.

Keeping the water safe

• Use food-grade, opaque tank materials with tight lids and screened vents to keep out dust, light and insects.
• Split larger tanks into two compartments, so one can be cleaned while the other stays in service.
• Clean and disinfect tanks regularly, typically every six to twelve months, and keep the records.
• Avoid oversized tanks: water that sits for days loses quality.

Five questions for your design

1. What is the peak demand, and how many hours of storage does the building need?
2. Where will the tanks sit, and how will they be protected from the heat?
3. Can one booster set serve the whole building, or does its height call for pressure zones?
4. Is there a standby pump, and backup power for the pumps?
5. Can the tanks be cleaned without cutting off the supply?

How TEN X can help

TEN X installs water supply and drainage systems as part of its MEP works on villas and commercial buildings across Abu Dhabi. We coordinate tank locations, pump rooms and pipe routes with the consultant early, then test and commission the system before handover.

This article is general guidance. Water supply design must follow the approved drawings and the local water supply regulations.