"We've seen an increase in the Mexican reservoir supplies this summer," Ms. Spener said.
Its Karatamar Reservoir supplies water to the iron-ore industry of Rūdnyy in Kazakhstan.
The letter also said that the reservoir supplies drinking water to "nine million people, including 85percentt of Westchester County".
A century ago this was a reservoir, supplying hydraulic energy for crushing and washing lead ore hewn from the tunnel that stretches deep into the hillside.
More than a century ago, when the heath was broken and enclosed, the reservoir supplied water to drinking troughs, but it is no longer filled by the wind pump and hydraulic rams.
The agency has already idled one water treatment plant to conserve its reservoir supplies, and officials say they are likely to declare a Stage 2 drought, limiting when people can water their lawns.
In the 1976-77 droughthethe federal government set up a water bank; the state organised another one in the 1986-92 drought, when rainfall and reservoir supplies were 30% of normal.
O. H. Ivie, the main remaining reservoir supplying Midland, Odessa, San Angelo and other towns in the Permian Basin of West Texas, had been projected to run out of water as early as next summer, which would have forced cities in the area to rely on newly tapped supplies or to truck in water.
The reservoir supplies the wellbore with crude oil or gas.
