Urban Water Stress and Infrastructure

Rapid urbanization has concentrated water demand in metropolitan areas whose supply infrastructure, watershed management, or underlying geology often cannot keep pace, producing acute crises even in relatively wealthy cities. Cape Town, South Africa, came to international attention in 2017-2018 during its so-called "Day Zero" crisis, when a multi-year drought drove the city's main supply reservoirs, including the Theewaterskloof Dam, to critically low levels, and officials publicly counted down toward a projected date on which municipal taps would be shut off entirely; the city avoided that outcome only through severe consumption restrictions, limiting residents to 50 liters per person per day, alongside emergency groundwater and desalination measures, before rains eventually replenished the reservoirs in 2018. A comparable crisis struck Chennai, India, in the summer of 2019, when the city's four main reservoirs effectively ran dry, forcing the local government to transport water by rail from hundreds of kilometers away to supplement supply.