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

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

Before we start: what we know about Al Jnadrya

The centre of Al Jnadrya is at 24.8192, 46.8528, about 21.4 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 Jnadrya: Al Janadriyah Road, Imam Abdullah bin Saud bin Abdulaziz Road.

The nearest wadi channel is about 2 km from the centre of Al Jnadrya (OpenStreetMap). The centre of Al Jnadrya sits about 586 m above sea level (SRTM open elevation data).

Underground water tanks in residential buildings most often fail quietly. A slow seepage through a cracked wall, a failed joint or a corroded inlet pipe can run for weeks before anyone sees damp in the car park or a drop in pressure at the taps. For apartment blocks and villa compounds in Al Jnadrya, the first step is usually a leak check of the tank walls, floor and pipework rather than a full replacement, because the loss often traces back to one defined point.

Al Jnadrya sits at about 24.8192, 46.8528, roughly 21.4 km from the centre of Riyadh, with an approximate radius of 1.2 km. Its centre is about 586 m above sea level, which means the local ground and groundwater behave differently from lower, flatter parts of the city. The nearest wadi channel is about 2 km from the centre of Al Jnadrya. Because of that proximity, we pay closer attention to how rainfall runoff reaches the foundations of tanks and whether soil around the tank is saturated after heavy storms. Ground moisture can mask a leak or make a tank look wet when the source is outside the structure, so the inspection plan accounts for both sources before any repair is quoted.

Before the visit, ask the provider a few direct questions. Ask whether they will test the tank with it full and then with it partly drained, and whether they will check the external wall on the wadi-facing side. Ask how they separate runoff seepage from internal leakage. If repair is needed, ask for the internal coating price in the form of a per square metre rate, which for this work is typically SAR 25–70 per m², and ask how the total area is measured. Confirm access to the tank chamber and whether the building management must arrange it. A clear written scope before work begins will protect both the owners and the residents.

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

When do you need underground tank leak detection?

If you notice one of these signs in Al Jnadrya, it is a good moment to talk to the team:

• 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.
• Cracks in the concrete tank walls or floor.
• Construction joints and corners — we check this before anything else.

How we choose the tool in Al Jnadrya

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 Jnadrya

Questions from Al Jnadrya

Mistakes that cost more

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

The written outputs

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.