Very interesting question in ...

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Very interesting question in deed. I unfortunately have no answer but in my opinion realizing that rainwater is the main driver of groundwater recharge in most areas it is foreseable that rainwater harvesting would portend significant impact of groundwater recharge. Now, the scale of that impact can be quie varied due to several factors but assuming a very efficient and substantial catchment area for the RWH, especially in hilly terrain it can drastically limit groundwater recharge. Just a thought.