Chenab

The treaty allocated the three eastern rivers – the Ravi, Beas and Sutlej – of the Indus basin to India, while 80% of the three western ones – the Indus, Jhelum and Chenab – to Pakistan.

Indian experts say inadequate infrastructure has kept India from fully utilising even its 20% share of the Jhelum, Chenab and Indus waters under the treaty - a key reason they argue for building storage structures, which Pakistan opposes citing treaty provisions.

It took more than 20 years for the Indian railways to finish the bridge - over Chenab river - which ascends high over a deep ravine in the Reasi district of Jammu.

The construction of the Chenab bridge was approved in 2003, but faced delays and missed deadlines because of the region's treacherous topography, safety concerns and court cases.

Heavy rains have swollen three main rivers — the Jhelum, Sutlej and Chenab in eastern Punjab province — prompting the disaster management agency to be on high alert for more flash floods, which have already affected at least 15,000 people in the past three weeks.