A leak in the water distribution mains is identified by a puddle on the road’s surface, which is created by the leaked water after the soil in between the water distribution mains and the surface has been saturated. The process of plugging this leak involves, first digging vertically downward to the distribution pipeline. If the leak is found, it gets plugged. However, not always does the leak happen vertically below the puddle. Often, digging vertically downwards leads only to more accumulated water from the leak. In such a case, the authority identifies the leak by a trial and error method, ie, digging the ground on either side of the puddle in fixed lengths.

An acoustic water leak detection machine can reduce the excessive wastage of water from the leaks by pinpointing the leak even before a puddle is formed on the surface. Two acoustic leak detection machines have been provided to the Siliguri Municipal Corporation through the project. Training in the use of the same has been provided to engineers and officials of Siliguri Municipal Corporation. As a pilot study, these machines have been used to conduct a water audit in water zone 1 of the city.