A convoy of 50 minibuses and cars carrying leaders of Bangladesh Nationalist Party (BNP) began the march towards the Teesta Barrage bordering Lalmonirhat district where the Teesta river makes its way into Bangladesh from India.
"Our long march is not a programme against the government. Rather, we are holding the programme for ensuring people's due share of Teesta water...BNP is waging the campaign for Teesta's water as it is a life-and-death question for Bangladesh," BNP's acting secretary general Mirza Fakhrul Islam Alamgir said at a brief rally before the start of the march from Uttara area here.
The BNP demonstration came as officials said massive withdrawal of waters upstream of the Teesta has severely affected the major Boro crops particularly in four northwestern districts, often called the granary of Bangladesh.
They said the water flow in the Teesta river has dropped to 650 cusecs from 3,500 cusecs around this time last year.
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During his last month visit to New Delhi, Bangladesh's foreign secretary Shahidul Haque expressed concern about the drastic fall in the flow of water of the Teesta.
Bangladesh and India were set to ink a deal on the issue during Prime Minister Manmohan Singh's Dhaka visit in September, 2011, but West Bengal Chief Minister Mamata Banerjee reportedly raised objection over the proposed quantum of waters saying it would harm her state.
She also scrapped her tour to Dhaka accompanying Prime Minister Singh.
BNP, in a statement earlier, said the party leaders would stage six street side rallies on its way to the Teesta Barrage site and conclude the march holding another rally at Dalia area of Lalmonirhat.