Underground tank leak detection in Nmar, Riyadh: without breaking

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

Before we start: what we know about Nmar

The centre of Nmar is at 24.5689, 46.6804, about 16.1 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 Nmar: Southern Ring Road, Derab Road, Southern Ring Road Branch.

The nearest wadi channel is about 0.3 km from the centre of Nmar (OpenStreetMap). The centre of Nmar sits about 629 m above sea level (SRTM open elevation data).

Nmar sits in the western part of Riyadh, with its centre at 24.5689, 46.6804, roughly 16.1 km from the centre of the city and spanning an approximate radius of 1.2 km. The neighbourhood stands about 629 m above sea level, which means the ground here is higher than many parts of the capital. For a tank owner, that elevation matters because the groundwater table and the way water drains across the surface both shape how a buried tank behaves over time. Our leak detection work starts with that local picture, so the survey plan reflects how water and soil actually move around the site rather than a generic template.

The nearest wadi channel lies about 0.3 km from the centre of Nmar, close enough that seasonal runoff can reach low-lying ground during heavy rain. In practical terms, we check for saturated soil and signs of water movement around the tank pit before testing, because external water can mimic or mask a leak signal. Proximity to a wadi also raises the importance of inspecting the tank's outer surfaces and fittings, since moisture can accelerate corrosion. Where the tank's internal lining is in question, the cost of a recoating is commonly quoted at SAR 25–65 per m², so an accurate assessment of the damaged area is worth the time before any repair decision is made.

Owners in Nmar often make the same few mistakes, and our procedure is designed to avoid them. The first is waiting for a drop in fuel level to appear before arranging a check, when early leaks may only show as small, gradual losses that are easy to overlook. The second is assuming that rainfall or groundwater explains every unexpected reading, without testing whether the tank itself is the source. The third is choosing a repair based on the visible symptom alone, without confirming where the leak is and how far the coating has degraded. We keep the inspection non-invasive, so the tank is assessed without breaking the ground open unnecessarily, and every finding is documented so you can act on facts rather than guesses.

The aim is to locate the cause with instruments first, so any opening is limited to one point.

Signs worth paying attention to

If you notice one of these signs in Nmar, 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

The most common causes

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

Tools we use in Nmar

How the work is done, step by step

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 Nmar

Questions from Nmar

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 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.