Both China and Pakistan are quite watery countries, the problem is water conservation.
See, the dry Northern China used to have both enormous floods on Yellow river, harvest destroying autumn rain floods, and at the same time have severe droughts through the rest of the year.
Damming made the issue much less severe, but not completely solved.
There is no alternative to massive water redirection projects, but that will require the amount of resources I think even China can't allocate.
South-North redirection took 40 years, and barely supplied needs of Beijing area.
But one thing is certain, eventually it will have to be done, and resources committed.