Causes for Depletion of Water excessive demand of water due to overpopulation the demand of water has increased considerably. More quantities of water are used and wasted over the time. Evaporation due to global warming and change in the climate, more amounts of surveys, water and groundwater is being evaporated due to excessive heat. There is a decline in the level of water in the reservoir and dams due to evaporation. Pollution most of the industrial waste water are dumped to these water sources. This in turn pollutes and contaminates water