A reservoir basin is reopening in San Francisco’s Portola neighborhood today after being emptied for two years while it was seismically upgraded.

The University Mound Reservoir North Basin, which supplies about 25 percent of the city’s tap water, is the site of the last major seismic upgrade of the local San Francisco water system, part of the $4.6 billion Hetch Hetchy system improvement program.

The basin, located near the intersection of University and Bacon streets, will now be a reliable source of water for drinking and emergency firefighting after a major earthquake, according to the San Francisco Public Utilities Commission.

SFPUC General Manager Ed Harrington and San Francisco Supervisor John Avalos were scheduled to hold a ceremony this morning to celebrate the reopening. At the 10:30 a.m. ceremony, city officials planned to turn a bronze wheel to begin refilling the empty reservoir.

Dan McMenamin, Bay City News

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