Why groundwater is overused?
Groundwater is overused when we extract more water than what is being replenished by rain. Though groundwater is a renewable resource that gets replenished by nature, excessive extraction leads to overuse.
The overuse is particularly found in agriculturally prosperous regions like Punjab and Western U.P., hard rock plateau areas of central and south India, some coastal areas, and rapidly growing urban settlements. About 300 districts have reported a water level decline of over 4 metres in the past 20 years. Nearly one-third of the country is already overusing their groundwater reserves.
Explanation
The textbook explains that groundwater becomes overused when consumption exceeds natural replenishment through rain. The context identifies specific regions where this is happening - agriculturally prosperous areas (Punjab, Western U.P.), hard rock plateaus, coastal areas, and urban settlements. The statistics about 300 districts and one-third of the country overusing groundwater reserves add weight to the answer.