Inter Basin Water Transfer Link Project of India

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River Morphology

Effects of the water diversion on the channel morphology

Any water diversion structure such as dams, barrage or weirs temporarily (5 ro 20 years) or permanently (20 to 100 years) blocks the coarse sediment (sand, gravel etc.). The reduction of sediment would cause the widening of braided river

Increasing the sinuosity of the meandering rivers. In both the cases, bank erosion will increase and it will be the dominating processes for a long period (10 to 50 years)

In many locations of Bangladesh the floodplain sedimentation balance the subsidence, such as in Barisal and Noakhali districts. The reduced sediment supply from upstream will cause less floodplain sedimentation. This may create drainage congestions after certain years

In the Meghna Estuary areas, where subsidence due to compactions (4 to 6 mm/year) is pronounced, reduction of sediment will be the disastrous for a long-term and sea level rise will aggravate the situation.

 
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Source: Presentation made by A.N.H. Akhtar Hossain PEng,  Engr. S. M. Mahbubur Rahman and  Engr. S.H.M. Fakhruddin at Press Club Dhaka.

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