An aerial view of the Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo state November 18, 2014. Brazil's worst drought in 80 years has left the Cantareira system, that provides greater Sao Paulo with most of its water, with the lowest water level on record, with daily rationing becoming common in the region's smaller cities, according to the state authorities and the two main reservoirs serving metropolitan Sao Paulo, South America's largest city, could dry out by February if relief does not arrive in the upcoming rainy season. (Photo by Nacho Doce/Reuters)

An aerial view of the Jaguari dam station, part of the Cantareira reservoir, during a drought in Braganca Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view shows the Jaguari dam station, part of the Cantareira reservoir, during a drought in Braganca Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of the Jaguari dam station, part of the Cantareira reservoir, during a drought in Braganca Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of cows on the cracked ground of Jaguari dam, part of the Cantareira reservoir, during a drought in Braganca Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of the Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of the Jaguari dam, part of the Cantareira reservoir, during a drought in Braganca Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of the Jaguari dam, part of the Cantareira reservoir, during a drought in Braganca Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of the Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of the Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of the Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

An aerial view of a car on the cracked ground of Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

Trucks drive along a bridge over the dry lakebed of the Atibainha dam, part of the Cantareira reservoir, during a drought in Nazare Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)

Workers of SABESP, Brazilian enterprise of Sao Paulo state that provides water and sewage services to residential, commercial and industrial areas, stand next to the Jaguari dam station, part of the Cantareira reservoir, during a drought in Braganca Paulista, Sao Paulo state November 18, 2014. (Photo by Nacho Doce/Reuters)