Question

how do you think will the dams across the rivers affect the delta soils

Answer 1

All streams contain sediments: a waterway, as a result, can be viewed as an assortment of streaming silt as much as one of streaming water. At the point when a stream is stalled behind a dam, the sediments it contains sink to the base of the supply. 
The extent of a stream's aggregate dregs stack caught by a dam – known as its "trap proficiency" – approaches 100 percent for some ventures, particularly those with expensive stores. As the dregs aggregate in the repository, so the dam step by step loses its capacity to store water for the reasons for which it was constructed. 
Each supply loses the capacity to sedimentation in spite of the fact that the rate at which this happens fluctuates broadly. In spite of over six many years of research, sedimentation is still presumably the most genuine specialized issue confronted by the dam business.