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Reservoirs of Brazil's biggest city and rivers feeding them are running dry

FILE - In this Oct. 10, 2014 file photo, the frame of a car sits on the cracked earth at the bottom of the Atibainha dam, part of the Cantareira System responsible for providing water to the Sao Paulo metropolitan area, in Nazare Paulista, Brazil. Halfway through the rainy season, the key reservoir for the hemisphere's largest city, the Cantareira water system, holds just 6 percent of its capacity, and experts warned Friday, Jan. 16, 2015 that authorities must take urgent steps to prevent the worst drought here in more than 80 years from drying it out. (AP Photo/Andre Penner, File)

FILE - In this Oct. 10, 2014 file photo, the frame of a car sits on the cracked earth at the bottom of the Atibainha dam, part of the Cantareira System responsible for providing water to the Sao Paulo metropolitan area, in Nazare Paulista, Brazil. Halfway through the rainy season, the key reservoir for the hemisphere's largest city, the Cantareira water system, holds just 6 percent of its capacity, and experts warned Friday, Jan. 16, 2015 that authorities must take urgent steps to prevent the worst drought here in more than 80 years from drying it out. (AP Photo/Andre Penner, File)  (The Associated Press)

Sparse rains, increased use of water and unusually hot weather have aggravated the worst drought to hit Brazil's most populous city in more than 80 years and water experts say its water supply might be in danger.

The reservoirs and rivers that provide water to millions in this city have received less rainfall than hoped during the first weeks of the wet season, raising fears that they won't be replenished as hoped.

The Cantareira water system, the largest of six that provide water to some 6 million of the 20 million people living in the metropolitan area of Sao Paulo city, is at 6 percent of its capacity of 1 trillion liters (264 billion gallons), water utility Sabesp said Friday on its website.