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home : news : national news free April 26, 2017

   
2/27/2017 11:23:00 AM
California dam spillway outflow slowed to clear debris

OROVILLE, Calif. (AP) — California water authorities started slowing the outflow Monday from the Oroville Dam’s crippled spillway to allow workers to remove debris blocking a hydroelectric plant from working.

After a winter of heavy storms, water managers earlier this month used the emergency spillway for the first time in the 48-year history of the country’s tallest dam after a chunk of concrete tore out the main spillway.  

But the flow of water ripped through a road below and carved out deep chasms in the ground, leading authorities to evacuate nearly 200,000 people Feb. 12 for two days for fear the emergency spillway could fail.

Monday’s slowdown started at 6:45 a.m. and will continue throughout the day, said state Department of Water Resources spokeswoman Lauren Bisnett. The amount of water released will gradually go from 50,000 cubic feet per second to zero.

Crews have already been working to fortify the badly eroded emergency spillway.

The outflow from behind the 770-foot-tall dam will be stopped for several days to give workers time to clear concrete and other debris from a pool at the bottom of the spillway.  

The debris must be removed in order to restart the underground Hyatt Power Plant. The plant helps manage reservoir levels.

The reservoir’s water level has been reduced nearly 60 feet since it reached capacity at 901 feet earlier this month, the department said.

The department said it will continue releasing 50,000 cubic feet of water per second the rest of Sunday and overnight. With inflows of water at only 25,000 cubic feet of water per second, more space will be made at the reservoir before the outflows are cut on Monday.


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