India, March 27 -- Groundwater levels in Gurugram have dropped sharply over the years, prompting the Municipal Corporation of Gurugram (MCG) to revive and expand rainwater harvesting systems, officials said.

According to official data shared by Central Ground Water Board (CGWB), the average groundwater level has fallen from 7.57 metres in 1974 to below 30 metres now, placing the city in the "dark zone" category.

Officials said the decline has started affecting supply during summers. While the Gurugram Metropolitan Development Authority (GMDA) manages supply through its Basai and Chandu water treatment plants, shortage is still reported in May and June every year.

MCG officials said unregulated extraction through borewells, including pr...