Why heavy rainfall triggers waterlogging in many cities?

Another monsoon and the metro cities are inundated once again. Have you ever wondered how waterlogging became the unfortunate reality of India’s big cities every year during Monsoon? Mumbai, Delhi, Lucknow, and Kolkata, are among the major cities that get waterlogged in every monsoon. After all, why do big cities and metropolises drowned after rains? This time a similar picture has come out from all the big cities of the country. The picture of Kolkata is even more intimidating. In most parts of the country, when it is time for the rain to stop, then the clouds are raining heavily in Kolkata. There is no street, no area left in the city which has not been submerged in rainwater. After heavy rains, a flood situation arose in the city of Kolkata. Watch this video.