1,901 views

1:31

Watch
- Search Videos
  
  Advanced search »
- Submit a New Video
Discuss
About
- Try clicking on the various channels to see videos posted to that channel - if you're into music you can click the Music channel to get more music sifts - go on and explore! Use the "hotness" when you have opened the channel link to get videos that have gotten a lot of votes, or use "newness" to have a look at the new sifts.
  When browsing sifts you like, have a look at the Related Posts list to see other related videos, click the tags under the video title to see more sifts tagged with the same tags or have a look at other sifts from the same user in the More Posts By list. If the sifted video is in a play list, have a look at the play list to see other interesting videos the Sift users have linked together.
  Enter the Sift Lounge to chat with online sifters about anything and everything, or read interesting posts in the Sift Talk forum.
  The Top New Videos list is always full of interesting, current videos. It is always recommended that you have a look through the Top New Videos, but also have a look at these:
  - Upcoming Unsifted Videos - active video submissions that neither are published to the front page nor archived to the submitter's personal queue
- Have you seen a really funny, surprising, scary, interesting, cute or in any other way extra good quality video?
  Post and share it here - VideoSift is the best video aggregator on the Web, where we share, discuss, promote, and interact with the best videos out there on the web. Post it here, and share it with the large community of video-interested users. And - you are guaranteed to find more very good videos here already!
  Mind you, we only share videos you discover that someone else has made; if you "self link," by posting a video you have made, have posted or have interests in, you risk the ban hammer - read the posting guidelines before posting. The sift is NOT for promoting your own videos - it is for sharing videos others have made.
  Submit a Video Now »
Login

Lake Berryessa is 3.5' OVER the Glory Hole Spillway

7 years 10 months ago

From NYT:
"...a really big drain called a spillway. And once you see it full of spiraling water, it is hard to take your eyes off it.

For the first time in a decade, January and February have brought so much rain that the lake in the Napa Valley area north of San Francisco has maxed out its water capacity. To prevent flooding, this 72-foot-wide concrete funnel is sucking down the excess.

Spillways come in many shapes and sizes. The one at Berryessa is of the “bellmouth” persuasion, which is also called a morning glory, plug hole or a glory hole....

On Tuesday, water was flowing into the hole at around two million gallons a minute, which is just a small fraction of how fast it can get.

Powerful as it looks, the spillway probably wouldn’t pull you down....It’s a lot of water, but not a lot of velocity....

In the world of spillways, bellmouths like this one are uncommon... Engineers pick them because they can spill a lot of water at one time and still maintain control...There are others spillways of this type around the world, including at the Shing Mun Reservoir in Hong Kong, Hungry Horse Dam in Montana, Nekogahora Pond in Japan and the Ladybower Reservoir in England."

022317