write an article on the topic water harvesting why and howin 150 words
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Answer:
Rain water harvesting is the collection of rainwater into the man made resources or any natural resource like pond, lake, etc at the same place where it falls from rooftops or ground. Two main techniques of rainwater harvesting are storage for future use and recharge into the ground. It can be used for crop harvesting, gardening, toilets, etc. Following are the benefits of rainwater harvesting at individual or city-wide level:
It helps in reducing the water supply bills especially to the institutions.
Rainwater recharged to the ground positively affects groundwater quality by diluting fluorides, nitrates and its salinity.
It contains almost neutral pH and zero hardness which makes it more able to be used in homes, industries, institutions and other commercial establishments.
It may reduce the stress of public water supply sources.
Recharge of rainwater to the ground prevents sea-water immersion into the fresh water bodies in the coastal areas.
It helps in controlling urban flooding if people do rainwater harvesting from rooftops.
It reduces water demands of people from the municipality thus lessens energy consumption too in distributing water all through the city.
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Rainwater harvesting is a technology used for collecting and storing rainwater from rooftops, the land surface or rock catchments using simple techniques such as jars and pots as well as more complex techniques such as underground check dams. Broadly there are two ways of harvesting rainwater, namely; surface runoff harvesting and rooftop rainwater harvesting. Rainwater harvesting is the collection and storage of rain for reuse on-site, rather than allowing it to run off. The stored water is used for various purposes, such as gardening, irrigation, etc. The importance of rainwater harvesting lies in the fact that it can be stored for future use. Just as it can be used directly so also the stored water can be utilized to revitalize the ground level water and improve its quality. This also helps to raise the level of ground water which then can be easily accessible.