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Life cannot be imagined without water (बिन पानी सि सन ू ):

55. No one can dispute about the importance of water. It is essential for life on earth. It is available on the planet in all the three phases namely solid, liquid and gas. Water ties together, major parts of earth climatic system, in the form of air, clouds, ocean, lakes, vegetation, snowpack and glaciers. Conversion and reconversion of one form of water to any other, is commonly known as water cycle which shows continuous movement of water within earth and atmosphere. In the form of liquid and solid, it is available on earth, on the surface and beneath the surface. Snowpack and glaciers are solid forms on the surface while in liquid form, it is available in the running condition as oceans, rivers, streams, waterfalls etc. and sometimes as water body or wetland in the form of lakes, ponds and other wetlands. Inside/beneath the surface, it percolates the sand and rocks and is available as ground water. Existence of ground water is necessary and integral part of water cycle in as much as it contributes to the surface water which is involved in the process of conversion as vapour/cloud due to heat or in cold areas solidify as snow. In the areas where large quantity of water evaporates, and results in scarcity of water on the surface, it is ground water which helps to maintain surface water and also contributes to fill water in wells. Water influences intensity of climate variability and change. It is key part of extreme events like drought and floods. If surface water exceeds the limit of carrying capacity, it will flood the plains and if evaporation of surface water is very high and recharge is not as per the requirement, it may result in causing drought. Not only for human sustenance, but, for every activity or in other words, in every walk of life, mankind needs water.