Underground tank leak detection for residential buildings in Al Zhra, Riyadh

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

Underground tank leak detection in Al Zhra: the local context

The centre of Al Zhra is at 24.5755, 46.6455, about 15.7 km from the centre of Riyadh, with an approximate radius of 1.2 km. The approximate area shown on the map is centred here. Main roads in or near Al Zhra: Hamza bin Abdul Muttalib Street, Sheikh Abdulrahman bin Furyan Street, Sheikh Ishaq bin Abdulrahman bin Hassan Street.

The nearest wadi channel is about 1.6 km from the centre of Al Zhra (OpenStreetMap). The centre of Al Zhra sits about 676 m above sea level (SRTM open elevation data).

Al Zhra is a residential district where many buildings still rely on underground water tanks, so a leak check often begins with the site's location and the ground around it. The centre of Al Zhra sits at 24.5755, 46.6455, about 15.7 km from the centre of Riyadh, and its approximate radius is 1.2 km, so a technician will usually work with a compact area rather than a large spread of properties. The centre of the district sits about 676 m above sea level, and the nearest wadi channel is about 1.6 km from the centre, which matters because ground moisture and drainage patterns can affect how water behaves around a buried tank. These facts are the first things to note before any equipment is brought on site.

Several points are left to the site visit itself. The technician needs to see the actual tank, its access points, the pipe runs to and from the building, and the condition of the surrounding soil and slab. Whether a tank is concrete, steel or lined, how old it is, and whether water is visibly seeping at the walls or joints can only be judged in person. Any repair scope, including the internal coating, depends on what is found. Coating costs are typically quoted per square metre, in the range of SAR 25–70 per m², but the final area and specification are confirmed only after measuring the tank on site.

To help the technician, it is useful to have a few things ready before the visit. Note the building's address and the approximate tank location, and share any previous repair records, invoices or water bills that show unusual consumption. Tell the technician when water levels seem to drop without explanation, and mention any damp patches, cracks or wet areas noticed in the basement or garden. Clear access to the tank cover and pump room saves time, and a plan of the plumbing layout, even a rough sketch, makes the inspection faster and more accurate for everyone involved.

For a residential building, shared risers, tanks and pumps are checked as one system.

Signs that call for underground tank leak detection

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

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

Causes we see in the field

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

Tools and methods, and when we use them

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 Zhra

Common questions about underground tank leak detection in Al Zhra

What we advise against

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

What you get after the work

The written output: the written level-test result and the recommended next step. The report is numbered and can be checked with its verification code.