in the absence of a fair water distribution system,** dams change the water dynamic for those living downstream. **water shortage as is, and provinces harbouring resentment over water, dams are costly just in terms of their conflict provoking nature.
I 2nd that. That is rightly a major concern in Sindh. I am not sure if any of you have been to areas like Thatha, Sajawal or Hyderabad, if you go there you will see youself why they are so concerned about it. you can literally walk across river Indus near Kotri barrage.