India, Sept. 30 -- A municipal survey has revealed that large-scale encroachments on natural ponds are one of the biggest reasons behind Gurugram's perennial waterlogging during the monsoon.

According to the survey conducted last month, of the city's 181 ponds, nearly 65 have been either encroached upon or built over, severely disrupting the natural drainage system.

The findings explain why the Millennium City routinely witnesses severe flooding at 153 points every rainy season. Officials said most of these waterlogging-prone areas originally had ponds nearby that acted as natural catchment basins. Over the years, however, villagers and local residents either filled these ponds or constructed structures such as temples, schools, communi...