Lake Berryessa glory hole back in action

Robert

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Gulp! Drones dodge spray from California's gaping moist glory hole
Spectators swallow hard as cloud seeds flow forth

Cool drone footage in original story here.

glory_hole.jpg

Drone operators have been gazing in fascination as, for the first time in over a decade, the Lake Berryessa glory hole has been swallowing up excess water and shooting it down into Putah Creek.




A glory hole – or to give it the proper name, a morning glory spillway (named after the beautiful flower's shape) – is a perfectly normal engineering term in dam design. Admittedly it's also a catchphrase used in the sex industry for a holey wall allowing anonymized interaction, not to mention my mum's name for the cupboard under the stairs - such is language.

In this case, the spillway is in the lake created by the building of the Monticello hydroelectric dam in 1963, which has been filling up in recent weeks as the California countryside has been lashed with heavier than usual storms.

The glory hole, a 72-foot (22-metre) in diameter spillway capable of swallowing up 48,400 cubic feet of water per second, is now in operation and is drawing spectators keen to get an eyeful.
 
an advantage of that type of spillway drain is that the water is aerated as the water enters the spillway, which prevents cavitation damage to the spillway

 
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