Collecting rainwater is not only water conserving, it is also energy conserving since the energy input required to treat and pump water is avoided. It also prevents soil erosion and flooding caused by runoff. It increases the availability of water. The quality of rainwater is better than other sources such as surface water or groundwater. Salts and minerals are picked up by water from soil and rocks on its way to surface water bodies such as lakes/rivers. Groundwater is contaminated by many pollutants due to indiscriminate use of pesticides and incomplete treatment of effluents by industries. In this way rainwater is better than these two types of water sources.
However, rainwater harvesting is location specific. Thus, rainwater falling in non-industrialized areas can be more pure compared to the rainwater in industrial areas where pollutant emissions are prevalent, or in agricultural regions where intensive use of pesticides and insecticides is prevalent. Rainwater is generally soft and can significantly reduce the need of water softening treatment.
However, rainwater harvesting is location specific. Thus, rainwater falling in non-industrialized areas can be more pure compared to the rainwater in industrial areas where pollutant emissions are prevalent, or in agricultural regions where intensive use of pesticides and insecticides is prevalent. Rainwater is generally soft and can significantly reduce the need of water softening treatment.
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