'Roughly 50% of all stored water is used for environmental purposes. That means releases from reservoirs — many built on the dime of farmers and the likes of PG&E — keep water flowing in rivers and some streams year round making it possible for fish to survive ...
40% of the water is used to grow food for people to eat in places like Los Angeles, San Francisco, Manteca, Turlock, Peoria and Illinois.
The remaining 10% is for urban uses that includes swimming pools, ornamental fountains, keeping non-native grass lush, and for drinking.
The state and federal government essentially manage half of all stored water exclusively on behalf of fish, the river, and the Delta. They also manage much of the remaining 50% to benefit fish and rivers as well as the Delta before it reaches farms and cities.'