Friday, March 24, 2017

Finding a fix

Damage and design flaws at Oroville Dam spillway point to lengthy repairs; temporary solution: jump the gap

UC Davis civil engineering professor Jay Lund says it's a typical practice at other dams, but this would likely be the first attempt to jump a hole. KOVR Sacramento


Sacramento Bee & KOVR Sacramento

The main spillway at Oroville Dam is riddled with design flaws and so badly damaged that an independent panel of experts has concluded it's probably impossible to repair the structure before the next rainy season begins. One temporary recommendation is building an angled flip just above the collapse site. If water needs to be released from the lake down the spillway, the flip would launch the water away from the hole, preventing further erosion.


DWR responds to dam's 'significant risk' report

KRCR Redding

The Department of Water Resources (DWR) is responding to a report quoted in an article by the Associated Press which states all of California could face a very significant risk if the Oroville Dam spillway isn't fixed by November. The report does not pinpoint the exact "significant risk". However, DWR officials have worried all along that if the damage to the main spillway expanded upwards to cripple the flood gates, there wouldn't be a way to control the outflow of water from the lake outside of the power plant.


Another reservoir overflows as Sierra rain returns

Los Angeles Times

The milestones marking California's wettest year in decades continued to pile up Thursday, as state water officials said a reservoir in the Sierra Nevada has exceeded capacity for the first time in 21 years. Lake Davis began overflowing onto its earth-and-rock spillway Wednesday after a couple of light rainstorms. The last time the rain-filled lake reached capacity was in May 1996.