Hi Muhammad,  I would ...

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Hi Muhammad, 

I would second the other answers in that politics and proper accounting play major roles in large scale water projects. Even if the technical solution is incredibly well designed the unforeseen can happen, populations can grow, climate patterns can shift, and sooner or later there will not be enough water to go around. This scenario has been played out in the western United States around the Colorado river. In the best case scenario the original contract will be honored and upstream communities will tap into additional water supplies, but if the original contract is not upheld then the downstream communities cannot do much about it. Hence the need for proper accounting and for all communities to be politically invested in upholding the contract.