How is the water from the California Delta allocated each year? How does the differ in the wet and dry years?

Besides being the hub of California’s water supply, the Delta is a vital farming region with complex infrastructure connecting the Bay Area to the Central Valley. More than half-a-million people live on farms and in 14 cities and towns in five counties. Infrastructure includes five highways, three railroad lines, two deep-water shipping channels, hundreds of natural gas lines and five high-voltage transmission lines. The Delta also has more than a half a million acres of productive farmland.