In 2015, the city of São Paulo (Brazil) faced the worst drought in eight decades. The city’s biggest reservoir reached technically 0% of its volume capacity, leaving thousands without water supply. The water company was forced to drain water from the reservoir “dead volume”; a reserve that is below the level of the water locks and had never been used before. The water quality is questionable due the amount of sediments and mud. The state government had already been warned since 2004 that the collapse was imminent and almost nothing was made to mitigate it.