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Water Resources

WATER CRISIS IN PAKISTAN
BY FARRUKH SOHAIL GOINDI
The most dreaded water scarcity event has at last hit Pakistan. This is nothing unexpected. The manner in which we have been used to handle our resources and national affairs, this catastrophic occurrence was bound to take us over. Nature’s endowment of water blessings upon Pakistan has always been envied by the world at large. At the time of independence 5000 cu/m of water was available for each Pakistani, which has now reduced to 1000 cu/m because of uncontrolled population growth.
Water is one resource that can not be generated it can only be preserved. Farsighted nations try to conserve each every drop of water available to them because they are aware of the fact that if this commodity is not prudently preserved and used, the human survival itself would be jeopardized and future wars would be fought for its possession and control. The only manner to conserve this resource known to man so far is to construct dams. Dams have been built for atleast 5000 years and, their functions have evolved with the developing needs of the society. Most likely, the earliest dams were built to store water for domestic and agriculture water supply. With the onset of industrial era, hydropower became a major reason to built dams. Presently dams are built to serve many other functions, such as, flood control, navigation, and recreation. According to an estimate the present volume of all storage reservoirs with gross capacity of 5 cu/km and above amounts to some 4900 cu/km. Out of this about 975 cu/km lie in North America while about 1770 cu/km are in Asia with majority in China. China has some 83000 reservoirs built for various purposes, of which 330 are major in size. While in Pakistan we have two major and about a dozen smaller reservoirs.
It has been said that all reservoirs are doomed to die. This is due to loss of their storage capacity because of sedimentation. Assuming a hundred year average life of reservoirs (Lake Mead,...