More than 10 million people in Delhi, the capital of India, are without water.
Protesters demanding more government jobs seized the Munak canal, the city’s main water source on Friday.
The Munak canal supplies around three-fifths of water to Delhi’s 16 million residents.
The army took control of parts of the canal on Monday morning, but repairs are expected to take time.
It will take three to four days before normal supplies resumed to affected areas.
All Delhi’s schools have been closed because of the water crisis. Water tankers had been dispatched to affected areas of the city, but that would not be enough to make up for the shortfall.