What is the scope of using an abandoned borewell (previously used for drinking water supply) for recharging groundwater through storm runoff created by rainwater? If yes, does this approach need any upgradation / adaptation?
Without some treatment, stormwater seldom would meet desired drinking water quality, so injecting storm water could degrade the groundwater quality. If the stormwater could be treated to a suitable level before injecting, that would be preferable. Otherwise, the groundwater may need treatment if it becomes contaminated or less reliable relative to quality. It the groundwater uses are not close to the injection site, some filtration and quality improvement may be expected, but regular testing and/or treatment might still be needed. Understanding the types and amounts of contaminants likely in the land uses in the runoff waters might help determine how much success is likelyL and whether pretreatment and/or post treatment of injection or withdrawal waters are needed.
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