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Groundwater in deep hardrock fissures

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Created on 01 June 2009
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Description

This camera work is thanks to Mr P. Ganesh of Ayyappa Aqua Solutions . Here we see how fissures in hard rock discharge water into a bore-hole. Typically fissures are observed between 80 to 400 feet in this hard rock terrain. Yields of water are very less ranging from 1000 litres to 6000 litres per hour. Bore wells being in semi-arid parts of India, annual rainfall is also low ranging from 300 to 800 mm. Soil moisture is in deficit for 10 out of 12 months and approximately only 5 to 8% of rainfall migrates below 1 metre. Artificial recharge is one way to tackle the situation and increase groundwater. Managing and understanding available groundwater is crucial to India water security and future. We have seen such boreholes absorbing between 2000 to 15000 litres per hour. Rooftop rainwater can be lead after filteration to these boreholes to recharge aquifers.

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