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Water flowing over emergency spillway at tallest US dam
MICHAEL BALSAMO and RICH PEDRONCELLI
Associated PressFebruary 11, 2017
Water flows through break in the wall of the Oroville Dam spillway, Thursday, Feb. 9, 2017, in Oroville, Calif. The torrent chewed up trees and soil alongside the concrete spillway before rejoining the main channel below. Engineers don't know what caused what state Department of Water Resources spokesman Eric See called a "massive" cave-in that is expected to keep growing until it reaches bedrock. (AP Photo/Rich Pedroncelli)
OROVILLE, Calif. (AP) — Water started flowing over an emergency spillway at the nation's tallest dam, on Lake Oroville, for the first time Saturday after erosion damaged the Northern California dam's main spillway.
Officials hoped to avoid using Oroville Dam's emergency spillway, fearing it could cause trees to fall and leave debris cascading into water that rushes through the Feather River, into the Sacramento River and on to the San Francisco Bay. Crews prepared for several days, clearing trees and brush.
Water began running over the emergency spillway around 8 a.m., according to California's Department of Water Resources. It was the first time the emergency spillway has been used in the reservoir's nearly 50-year history.
Once the water level of Oroville Lake rises above a certain elevation,
water begins to flow automatically into the emergency channel.
originally posted by: corblimeyguvnor
a reply to: burntheships
I guess it is TOO LATE, short term, you can't have fixers working if that turbulence happens. If it continuances up hill as it seems to be, hope them Pylons and the electrical system hold out
Unexpected erosion chewed through the main spillway earlier this week, sending chunks of concrete flying and creating a 200-foot-long, 30-foot-deep hole that continues growing. Engineers don't know what caused the cave-in that is expected to keep getting bigger until it reaches bedrock.
Water started flowing down the spillway into the Feather River early Saturday, with officials continuing to emphasize there was no imminent threat to the public or to the integrity of the dam.
"Relatively speaking, it's a small spill," See said, noting that the flow over the emergency spillway is expected to end in the next 38-56 hours.
"The lake will actually drop and the spill will cease," he said.
The dam is not threatened by these conditions,” said Bill Croyle, acting director of the Department of Water Resources. “These kinds of flows are typical for this kind of runoff period.”