Approaching drastic water rationing in Sao Paulo

One downside of rapid urban growth is illustrated in Brazil where drastic water rationing may start soon:

In São Paulo, the country’s largest city with a metropolitan area of 20 million people, the main reservoir is at just 6 percent of capacity with the peak of the rainy season now past…

After January rains disappointed, and incentives to cut consumption fell short, São Paulo officials warned their next step could be to shut off customers’ water supply for as many as five days a week – a measure that would likely last until the next rainy season starts in October, if not longer.

State officials say they have not yet decided whether or when to implement such rationing, in part because they are still hoping for heavy rains in February and March. Indeed, thunderstorms in recent days have caused lakes to rise a bit.

Still, independent projections suggest that São Paulo’s main Cantareira reservoir could run out of water as soon as April without drastic cuts to consumption.

While this problem may seem far away, I imagine numerous big cities around the world would face major problems in addressing a shortage of certain resources if something “out of the ordinary” – whether weather or changing political conditions – occurred. Wealthier big cities are expected at the most basic level to have water, electricity, sewers, and other features of modern infrastructure but these could be threatened by a variety of factors. And while the article notes that residents and institutions are scrambling to meet the crisis, cities should have some sort of long-term planning for some of these foreseeable issues.

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