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Flood control agencies (not DWR) have the most say in regard to releases. In whats known as the Bay-Delta Plan, state water regulators are amid a years-long effort to negotiate a policy for how much water should be kept in rivers that flow to the Sacramento-San Joaquin River Delta to meet the needs of both people and wildlife. Restore Hetch Hetchy intends to undo this Great American mistake, and return the valley to Yosemite National Park and all people. This is wonderful information. It allowed the water over the spillway to move too fast creating a vacuum between the water and the concrete that pulled the concrete sections out of the spillway. These graphs will always read low because they represent the percentage of the seasonal average at some point before the end of the season. Thanks for providing it for public information. It carried workers and materials for the dam, as well as tourists, postage and other amenities. A separate vote would have been Diamond Valley Lake is a man-made storage reservoir for storing imported water only. This dashboard is great! Delivery rates are 7-day average values. It used to be full (and beyond). 2151 River Plaza Drive, Suite 205 Official websites use .gov The OShaughnessy Dam i s 300 feet tall only medium-sized by todays standards. Email: kalexander@sfchronicle.com Twitter: @kurtisalexander. The water treatment facilities are Tesla Ultraviolet Treatment Facility, disinfecting the Hetch Hetchy supply; Sunol Valley Water Treatment Plant, treating the water from the Calaveras and San Antonio supply as well as the stored Hetch Hetchy supply; and Harry Tracy Water Treatment Plant, treating the water from the Crystal Springs and San Andreas supply. Since June 2011, the Water Enterprise has operated the Citys Emergency Firefighting Water System (EFWS, formerly known as the Auxiliary Water Supply System (AWSS)), an independent, high-pressure water supply system for fire suppression. Secure .gov websites use HTTPS Top ways to experience Hetch Hetchy Reservoir and nearby attractions Yosemite: Audio Driving Tour 1 Full-day Tours from $9.99 per group (up to 8) Private Yosemite Explorer Package | 3 Days of Adventure 3 Private and Luxury from $750.00 per adult (price varies by group size) Private Family Photo Day in Yosemite 78 Recommended Full-day Tours from