Creating dams is a good cause, but maintaining it is the challenge. Take, for example, this water which flows from the mountain comes with natural sand which is useful to control the sea which eats the land of Sindh. If dams are built, it should be well maintained and the sand which sits at the bottom of their soil should be transferred to rivers to fill the gap.
Sindh has the objection over many dams, just create thousands of dams but for Sindh launch desalination plant.
This solution is simple, Sindh has Sea so it should be provided with its fair right to filter the water. Take the example of Isreal, so why not Sindh can be self-sufficient with this sea water.