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Mesmerising drone footage captures floodwater spinning down 'Glory Hole' spillway

Mirror logo Mirror 23/02/2017 Rachel Bishop

Mesmerising drone footage has captured floodwater spinning down a spillway in Napa Valley, dubbed the "Glory Hole."

The Morning Glory Spillway whipped away excess water from San Francisco's Lake Berryessa after it overflowed for the first time in 10 years.

On Tuesday, water was flowing into the hole - dubbed the "Glory Hole" by locals - at around two million gallons a minute, which is just a small fraction of how fast it can get, reports the New York Times .

The lake had reached its max capacity after rising more than 440ft above sea level due to unusually heavy rainfall over January and February.

Lake Berryessa © YouTube Lake Berryessa

So to prevent flooding, the 72-foot-wide concrete funnel sucked away the excess water - which has made for strangely fascinating viewing.

Hundreds of locals have gathered to watch the show and take photos and videos since it started last Friday.

“I went up there the other day and there were about 15 drones flying around and people taking videos,” said Kevin King, an operations manager at the Solano Irrigation District, which oversees the day-to-day activities at the dam.

“It’s really dramatic to watch.”

The lake can hold about 521 billion gallons of water before it overflows.

Once the water has shot down the spillway it exits into Putah Creek, on the other side of the Monticello Dam.

Credits: Evan K/Youtube © Provided by Trinity Mirror Plc Credits: Evan K/Youtube

Other spillways similar to the Morning Glory include the Ladybower Reservoir in Derbyshire and the Shing Mun Reservoir in Hong Kong.

Although the water has risen about 30 feet since January, there is currently no danger of flooding at Lake Berryessa, according to Mr King.

In October 2016, the Napa County lake was half full and just at 398.6 feet, according to The Mercury News.

After the recent storms in January, the lake level reached 427.3 feet, and as of Friday, reached 440.1 feet.

"We're continuing to monitor elevation and the lake levels," said Solano Irrigation District (SID) Water and Power Operations Manager Kevin King told The Mercury News.

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