The San Jose Mercury News has an interesting article: Hetch Hetchy controversy: Could Yosemite's 'second valley' be restored?.
As always here in California, water is so precious that the battles over it have enormous consequences:
The group Restore Hetch Hetchy, the Sierra Club and other supporters of draining the reservoir say most of its 360,000 acre-feet of water storage can be replaced through more water conservation, recycling and storing water in other reservoirs, such as the massive Don Pedro Reservoir nearby. But critics, such as U.S. Sen. Dianne Feinstein and San Francisco Mayor Ed Lee, who calls the idea "insane," say water is a precious commodity in California and that no city should take the risk of giving up a reliable water supply. Silicon Valley business leaders also say that because two-thirds of Hetch Hetchy water customers live outside San Francisco, in places like Palo Alto and north San Jose, they should get to vote, too.