Water is an important source of life and is part of the five elements which constitutes the world and human body. 

As it's process goes water from water bodies evaporate, we know how the water cycle works but once the water falls down back on the earth, we render it useless while this water can be used for various purposes.

For irrigation, with built in water tanks which collect the rainwater and store it, filter the bacteria out. But this is not the only way this can be used.

Irrigation becomes a part of a larger motive of agriculture but rainwater can be used in our day to day life as well. Afte dthe rainwater has been collected and the dirt has settled down, the water upwards is clean and this water can now be used for washing dishes, in washroom, washing clothes and cleaning the house.

As 75% of the world's water resources can't be used because of his salty nature, we must not waste this portion of water which can reduce our dependency on natural water bodies and would not have to waste water which is suitable for drinking.

With changes in world biosphere with global warming at its peak, it is a necessity to use the resources you have to their fullest instead of wasting them.