Restoring Groundwater potentials through Roof top Rainwater harvesting in a Government school.

Rooftop Rainwater Harvesting, Kallinakkanahalli villageRooftop Rainwater Harvesting, Kallinakkanahalli village

Monsanto India Mega Breeding Station is located in Kallinakkanahalli village, Thondebhavi Hobli, Gowribidanur Taluk, Chickkaballapur district. The villages around the station face severe water scarcity. Despite six borewells drilled, only three were successfully yielding water. Since, we had recommended the drilling of another borewell to meet drinking water requirements of the village, it was necessary to introduce groundwater recharge measures to ensure that groundwater  levels do not gradually begin to decline. This concern increases since the erratic nature of rainfall can affect the amount of water available for recharge.AFPRO supported Monsanto in its efforts to demonstrate groundwater recharge measures. With the support of the Indian Institute of Social Science (IISc), Bangalore, the First Flush Lock was designed. It consists of two chambers one to store rainwater from the rooftops and the other consisting of a Slow Sand Filter (SSF). While, the SSF technology was also developed by AFPRO under a previous collaboration, the sand filter chamber filters out any impurities in the harvested water. This water is then transferred to a recharge pit, dug nine feet in the ground, consisting of sand filters to filter out any impurities. In addition to this, the capacity of the storage chamber has been increased so that an in case there is an increase in rainfall, the additional water will also be made available for recharge.

Due to the construction of this rainwater harvesting structure at the local government school (primary, middle and high school), 4.61 lakh liters of rainwater have been made available for recharging the groundwater. While, the exact amount of water percolating will depend on local hydro geo thermal conditions, the use of school building to recharge groundwater is a positive effort to help restore groundwater potentials in hard rock areas. Also, by training the teachers from the school on operation and maintenance of structure, efforts to ensure continued functionality have been made.

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