Prime Minister Manmohan Singh on Wednesday expressed his disappointment at the failure of two countries to sign the Teesta water accord and has told officials to "intensify their efforts towards finding a viable formula which does not cause undue distress to all those, in India or in Bangladesh".
During his address at Dhaka University on Wednesday before returning home, Manmohan Singh said, "I was hopeful that during this visit we would be able to come to an agreement on the sharing of the waters of the Teesta river."
"Both sides worked very hard to arrive at a solution that would be acceptable to all. Unfortunately these efforts did not meet their success within the time available," he said.
India and Bangladesh did not sign the Teesta river water sharing accord after West Bengal chief minister Mamata Banerjee opposed the present sharing formula that she said would harm the interests of farmers in northern Bengal.
Manmohan Singh was in Dhaka on a two-day visit that saw both countries inking pacts on various issues, including resolving a border row.
The prime minister added that he has asked "the concerned officials to intensify their efforts towards finding a viable formula which does not cause undue distress to all those, in India or in Bangladesh, who are dependent on the flows of the river".
The Teesta, which begins its journey in Sikkim, flows through north Bengal before entering Bangladesh. India and Bangladesh share 54 rivers.