Throughout the world the water table is going down. Today around 3800 km3 of fresh water is withdrawn annually from the world's lakes, rivers, and aquifers. This is twice the volume extracted 50 years ago.There is a fixed amount of water on the planet, which can be neither increased nor decreased. However, water is continually recycled and purified by the hydrological cycle. An increasing scarcity of fresh water is now a major threat to global agriculture, food security, health and peace among nations. In both the cases human factor is crucial. According to the World Meteorological Organisation (WMO) water use has raised six fold since 1900, more than double the rate of population growth.

With the world's population projected to top 8 billion by 2024 from 7, 248, 069,8417(Watch World Population) http://www.worldometers.info/watch/world-population/ now, freshwater supplies will not be able to keep pace with rate of growth in population.Ticking Bomb of Population, Even conservative estimates indicate that the population of Pakistan will grow to 208 million by the year 2024. About 50 per cent of the population will be living in the urban areas thus exerting additional pressure on the already strained existing facilities.