The basic source of irrigation for Pakistan agriculture is the Indus River. Water resources are becoming shorter due to the irregular flow of water in the Indus River. To overcome the problem of water shortage and to meet the water demands of rising populations, the Punjab and the federal governments are in favor of constructing more dams in order to store the water which is being wasted otherwise. On the contrary, the Sindh holds the point that the construction of dams such as KBD and Bhasha dam would deprived them of their due shares from IBIS. There has been a distrust regarding water sharing between the two provinces.
The conflict between the two provinces exists since pre-partition and the issue is still a bone of contention between the two provinces as Sindh have reservations regarding the construction of KBD and other dams i.e. they see the building of KBD as a cause of desertification and water scarcity, however Punjab feels it necessary to construct more dams in order to save our coming generations from severe water scarcity.
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http://www.waterpolitics.com/2013/03/03/indus-river-water-scarcity-and-the-conflict-between-sindh-and-punjab/