India, Sept. 6 -- For more than four days, the Yamuna has stayed swollen above danger marks, and Delhi is starting to feel the strain. With the river flowing higher than the outfalls of major drains, floodwaters are finding no escape, leading to persistent waterlogging in neighbourhoods across the city, particularly in north and east Delhi.

The situation has been further compounded by the shutdown of one of Delhi's primary water treatment plants at Wazirabad for nearly 36 hours, disrupting supply across large parts of the city. Experts now warn that the combination of stagnant water and disrupted services could tip Delhi into a public health crisis, as the risk of vector- and water-borne diseases grows with each passing day.

Officials e...