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

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

Before we start: what we know about Al Nkhyl

The centre of Al Nkhyl is at 24.7422, 46.6375, about 5 km from the centre of Riyadh, with an approximate radius of 3.9 km. The approximate area shown on the map is centred here. The centre of Al Nkhyl sits about 622 m above sea level (SRTM open elevation data).

Al Nkhyl has both villas and apartment buildings. The nearest wadi channel is about 1.4 km from the centre of Al Nkhyl (OpenStreetMap).

Main roads in or near Al Nkhyl: King Fahd Road, Imam Saud bin Abdulaziz bin Mohammed Road, Al Takhassusi Road.

Underground tank leak detection in Al Nkhyl starts with the setting, because the district sits at 24.7422, 46.6375, about 5 km from the centre of Riyadh, and its centre lies about 622 m above sea level. Al Nkhyl has both villas and apartment buildings, so the first check is whether the tank serves a single house or a multi-unit block, since shared tanks often show uneven draw-down that points to a leak. The nearest wadi channel is about 1.4 km from the centre of Al Nkhyl, which matters because ground conditions and water movement near drainage lines can influence how a tank behaves over time. These facts shape the first screen: the technician checks the building type, the recent water-level pattern, and the surrounding drainage context before any equipment is placed.

Several things are left to the site visit. The actual condition of the tank walls, the seams, the fittings and the inlet and outlet pipes can only be judged on the ground, with the tank accessible and the water level stable. Whether the tank interior needs recoating is also decided on site, since any internal coating work is quoted per square metre and priced in the range of SAR 25–70 per m², depending on the surface that is found. The technician also decides which test method suits the tank material and layout, and whether the result needs a follow-up check after the water is allowed to settle.

Information that helps the technician makes the visit faster and more accurate. Please note the building type, whether it is a villa or an apartment block, and how many households draw from the tank. Record recent bills or meter readings if you have them, any unusual damp patches, wet ground near the tank, or changes in water pressure. Share the tank's approximate size, its age, and the material it is made from, and say when the tank was last cleaned or repaired. Clear access to the tank cover and the surrounding area will save time on the day.

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

Signs worth paying attention to

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

• Damp or salt marks on the tiles above the tank
• The tank needs refilling faster than usual
• The pump runs for longer periods

Causes we see in the field

• Cracks in the concrete tank walls or floor.
• A common cause: construction joints and corners.
• A common cause: a float valve that does not close, so water is wasted.

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.

Quick comparison: facts and costs in Al Nkhyl

Questions from Al Nkhyl

Common mistakes we see

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

What you receive

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.