Underground tank leak detection for duplexes in Al Mwnsya, Riyadh

Prepared by the technical team · editorial review · last updated 13 November 2026 · Sources

What is specific about Al Mwnsya for underground tank leak detection

The centre of Al Mwnsya is at 24.8312, 46.7683, about 16.1 km from the centre of Riyadh, with an approximate radius of 1.2 km. The service-area circle on the map below is drawn from this point. The centre of Al Mwnsya sits about 608 m above sea level (SRTM open elevation data).

The nearest wadi channel is about 2.9 km from the centre of Al Mwnsya (OpenStreetMap). Main roads in or near Al Mwnsya: Prince Mohammed bin Salman bin Abdulaziz Road, Al Sahaba Road, Al Sahaba.

Picture the owner of a duplex in Al Mwnsya who notices the water bill creeping up while the house uses no more than before. There is no visible puddle, the garden looks normal, and the underground tank seems to be filling without trouble. Yet a small, slow leak can hide for months, quietly losing water into the ground beneath the property. For a family sharing a duplex, that kind of loss is easy to overlook until it becomes expensive.

Al Mwnsya sits at 24.8312, 46.7683, roughly 16.1 km from the centre of Riyadh, within an area of about 1.2 km radius. Its centre lies around 608 m above sea level, and the nearest wadi channel is about 2.9 km away. For an owner, these facts matter in a practical way. The distance from the city centre and the nearby wadi mean that rainfall can run off the surrounding ground unevenly, so soil moisture around an old tank may shift with the seasons and mask a leak. Because the site is well above sea level and close to a natural drainage channel, the ground beneath a duplex can also be prone to subsurface movement after heavy rain. An owner should treat any change in tank level or water usage as a signal worth checking rather than a normal fluctuation.

If you suspect a leak, start by recording the tank level and your meter reading at the same time each day for a week, while no water is being used. Next, check the inlet, outlet and overflow fittings and the tank lid for dampness or staining. Then arrange an inspection that tests the tank itself, not only the pipes. If the tank walls show wear, ask for the internal coating to be quoted per square metre, which typically falls within SAR 25–70 per m², so you can compare the cost of repair against replacement. Finally, keep dated notes and photographs of every step, so the findings are easy to follow up with the property manager or the other owner of the duplex.

In a duplex, the two floors often share lines, so tests are done floor by floor.

Signs worth paying attention to

These are the signs most often linked to underground tank leak detection:

• The tank needs refilling faster than usual
• Damp or salt marks on the tiles above the tank
• A noticeable drop in the water level overnight
• The pump runs for longer periods

The most common causes

• Construction joints and corners — we check this before anything else.
• Cracks in the concrete tank walls or floor.
• A float valve that does not close, so water is wasted.

Tools we use in Al Mwnsya

From the first visit to the report

1. Safety first: Tank lids and confined spaces are handled with ventilation and a second person on site.
2. Documented level test: Filling and use are stopped and the level is recorded against time.
3. Isolating the tank from the network: This tells us whether the loss is from the tank body or from the supply line.
4. Checking the body and connections: Inlet, outlet and overflow connections are inspected.
5. Recommendation: You get the next step in writing: repair, waterproofing or a line test.

Facts and costs — Al Mwnsya

Questions from Al Mwnsya

Common mistakes we see

• Waterproofing the tank before confirming the loss is from the tank and not the line
• Ignoring the float valve

What you receive

You receive: the written level-test result and the recommended next step, in a technical report with a verification code.