Posted on March 5, 2018 - 3:14pm
UC Berkeley engineering
What to fix, and what to replace? That’s the big question for Orville Dam. It has been almost a year since water brimmed to the top of Oroville reservoir and the tallest dam in the United States suddenly showed signs of possible, even imminent failure. Emergency releases eroded both the primary and secondary spillways with horrifying rapidity, and evacuations were ordered for 200 thousand downstream residents.
Posted on January 31, 2018 - 4:13pm
Feel it yet? That dire sense of déjà vu? It probably depends on your livelihood or interests. If you’re a Bay Area boulevardier or the type once described in singles ads as a lover of long walks on the beach, you’re no doubt delighted by the unceasing blue skies and unseasonably pleasant temperatures. But it’s another matter if you’re a farmer, salmon fisherman, water agency manager, skier or whitewater kayaker. Your income—or at least, your sense of well-being— is directly determined by what falls from the sky.
Posted on January 3, 2018 - 5:31pm
Disastrous wildfires are popularly associated with drought. But the North Bay fires followed one of the wettest winters in decades.
The nightly news tends to make things even more confusing. During drought, newscasters sound the alarm about dead trees and the general flammability of parched forests. After wet winters, dire warnings are issued about the abundant growth of grass and brush that will become tinder during the hot, dry days of California’s summer and fall. So are wet winters worse for fires? Or are dry winters worse?
Posted on November 20, 2017 - 4:29pm
Like everyone else, Robert Bea was appalled when almost 200,000 Californians living below Oroville Dam were ordered to flee for their lives on February 12. The evacuation was necessitated by severe erosion of the dam’s primary and emergency spillways caused by massive releases of water following torrential winter rains. But unlike most citizens, Bea knew the incident wasn’t engendered strictly by the vagaries of nature or an act of God. Human error was at play.
Posted on July 27, 2017 - 1:07pm
The news from Oroville Dam on Tuesday is nominally better. Water isn’t flowing over the top of wall at the auxiliary spillway, and erosion has stopped. Water releases are ahead of inflows, and the reservoir’s level is falling. Perhaps most encouraging for the close to 200,000 displaced locals downstream of the dam, the evacuation alert has been downgraded.
Posted on February 14, 2017 - 4:55pm