The deepest Sierra Nevada snowpack in four years is allowing California water officials to increase deliveries to farmers and cities, which have had to restrict water use during three years of drought.

On Tuesday, the state Department of Water Resources increased this summer's water deliveries to 40 percent of the amount requested. That's up from the 30 percent that was projected at the end of April.

Last year, the state also delivered 40 percent of the water sought by agencies that provide water to 25 million Californians and 750,000 agricultural acres.

A final water allocation is expected later this month.

State water director Mark Cowin says the projection was increased because of last week's snow survey, which showed the Sierra snowpack at 143 percent of normal.

Copyright 2010 The Associated Press.