"Why Cape Town Is Running Out of Water, and Who’s Next"

"The South African city plans to shut off the taps to 4 million people. But it's just one of many cities around the world facing a future with too little water."

"By late spring, four million people in the city of Cape Town—one of Africa's most affluent metropolises—may have to stand in line surrounded by armed guards to collect rations of the region's most precious commodity: drinking water.

Population growth and a record drought, perhaps exacerbated by climate change, is sparking one of the world's most dramatic urban water crises, as South African leaders warn that residents are increasingly likely to face "Day Zero." That's the day, now projected for mid-April, when the city says it will be forced to shut off taps to homes and businesses because reservoirs have gotten perilously low—a possibility officials now consider almost inevitable.

"The question that dominates my waking hours now is: When Day Zero arrives, how do we make water accessible and prevent anarchy?" says Helen Zille, former Cape Town mayor and the current premier of South Africa's Western Cape province, in a guest newspaper column published last week."

Craig Welch reports for National Geographic February 2, 2018.