San Gabriel Dam valve test sends torrent down canyon

The biannual release of water at a rate of up to 3,800 cubic feet a second is needed to ensure that the 25-story-high dam is able to control floods out of the San Gabriel Canyon’s 200-square-mile watershed. San Gabriel Dam operator Herbert Romero led 16 engineers clad in hard hats and yellow vests down a long flight of metal stairs on Wednesday to a cast-iron wheel on a ledge overlooking a stream bed a few miles above Azusa.

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San Gabriel Dam valve test sends torrent down canyon

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