Every raindrop matters at this time when large parts of the world are staring at water scarcity. With rapid climatic changes, increase in global temperature and population growth, there is a scarcity of potable water in many countries across the world. One way to deal with this crisis is to adopt rainwater harvesting.

Rainwater harvesting is the storing of rainwater during the monsoon season for the purpose of using it during periods of water scarcity. Generally speaking, it is a process used for collecting and storing rainwater for human use. Many techniques have been used by various beneficiaries to harvest and store water including channel reservoir, on-farm reservoir (Embung/Waduk), infiltration ditches, check dams, and infiltration wells. Traditionally, rainwater harvesting involves harvesting the rain from a roof, roof houses to be specific. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. As the volume of the storage tank is limited, the tank should be connected to an infiltration well to prevent flooding. The excess harvested water is channeled to the well and infiltrates the earth soil on its water network, which later becomes aquifers.

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. When fed into the ground level wells and tube well are prevented from drying up. This increases soil fertility. Harvesting rainwater checks surface run off of water and reduces soil erosion.

Reference:
http://sda.pu.go.id/bwssulawesi2/rain-water-harvesting/
http://www.kelair.bppt.go.id/sitpapdg/Patek/Spah/spah.html
https://www.shaymurtagh.ie/precast-concrete-products/rainman-rain-harvesting-system/
http://www.allegianceindia.in/latest-update/rainwater-harvesting/1