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The technology works to detect water leaks from a long distance, it can quickly find hidden leaks underground that could take many months to discover, saving water and money. The technology works by using satellites orbiting the Earth at a distance of 650km. Using SAR (Synthetic Aperture Radar) technology, sensors on the satellite emit a pulse of energy and then detect what is reflected back. In this way, the sensors can “see” not only the surface of the Earth, but up to three metres below it. Leaks don’t need to be significant to be detected – just 0.5 litres per minute is enough for the sensors to detect them and locate them within a 100-metre radius. The technology can even tell whether it is detecting surface water, wastewater or drinking water. And these super sensors work day and night, regardless of the weather – luckily, clouds can’t confuse them.