Some question conservation targets in water-system upgrade
By Peter Jamison
The $4.4 billion plan to upgrade the Bay Area’s aging water system — a vast public-works edifice that delivers water from Hetch Hetchy Reservoir in Yosemite National Park to San Francisco and surrounding cities — represents a fraught balancing act between the thirst of a rapidly swelling urban hub and the vulnerability of natural resources that have borne more than their fair share of strain from the steady dev
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