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Pic Of The Day

03/14/2017 5:03 PM

back to Oroville, drone shot. between the lines indicated the original spillway. to the right of the red line there had been heavy vegetation, now its been eroded heavily, does this look like it's ready to be put in service to you? can it handle millions of gallons running over it day after day for a Spring and plenty of summer? I think not

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#1

Re: pic of the day

03/14/2017 5:13 PM

Looks like a waste of a butload of concrete....

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#2

Re: pic of the day

03/14/2017 5:28 PM

It is probably more ready to be put into service than the slope immediately below the emergency spillway. If you don't like that solution, what else can you offer?

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#3

Re: pic of the day

03/14/2017 6:12 PM

You do realized just how friggin' big that project is? Those aren't 'N scale toys in a sandbox running around there.

ANyway, I think that area was pretty well eroded down to bedrock so it's not going to go much further no matter how much water gets tossed at it any more.

Also emergency fixes tend to get by on as little as possible being done as quickly as possible with a lot of hope that it will last until properly 'heavily bureaucratically and financially burdened repairs can be done (likely years and years from now).

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#4

Re: pic of the day

03/14/2017 6:27 PM

Have you seen this picture? San Jose Mercury News, 3days ago

Photo taken Jan. 27 shows some type of damage or discoloration on the main Oroville Dam spillway at the spot where the structure began to break up on Feb. 7. Water had begun to flow down the spillway Jan. 13, but the amount was cut back on Jan. 20 before being increased again on Jan. 30.

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#5
In reply to #4

Re: pic of the day

03/14/2017 7:04 PM

nice shot

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#6
In reply to #5

Re: pic of the day

03/14/2017 7:39 PM

I just ran across this too, "In a press release, DWR said the spillway releases will resume “on or around March 17.” Pretty ballsy move if you ask me. But hey we'll find out if the shotcrete holds up, huh?

And there's this picture. As if they didn't have a big enough hole in the main spillway already, they have to add more!

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#7
In reply to #6

Re: pic of the day

03/14/2017 7:55 PM

Presumably they're trying to whack some piles into the bedrock in an attempt to pin the (remains of) the structure together. Good luck with that.

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#9
In reply to #6

Re: pic of the day

03/14/2017 8:20 PM

Could be adding reinforcements and or making access holes to pump grout into voids under the existing concrete.

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#8

Re: pic of the day

03/14/2017 8:04 PM

What's the concrete finishing specs on a dam spillway anyway? Never built one, but of the one's I've walked across were pretty rough. Is that an OSHA requirement? So no one goes slip/sliding down the chute?

I'd think a nice whirlybird trowel would make for a smoother laminar flow down the chute? Any thoughts of expertise on it?

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#10
In reply to #8

Re: pic of the day

03/14/2017 8:26 PM

No expertise but I do know that if you break up the boundary between fast moving water and a surface it tends to have a substantial reduction on the suction effects that make water want to drag everything it's in contact with along with it.

Its one of the forces that are responsible for how those impossibly huge rocks in river channels and floodplain areas get into places that seem other wise impossible for them to have been moved there.

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#11
In reply to #8

Re: pic of the day

03/14/2017 8:34 PM

While trying to find specs for spillway finishes, I ran across this article about the San Roque Dam, .... "One of the important design aspects of the San Roque spillway included the installation of six air duct galleries that run underneath and transversely across the entire width of the spillway. As you look at the pictures of the finished spillway, the galleries look like six steps going up the spillway chute. The purpose of the galleries is to inject a protective cushion of air into the water. The galleries are designed with natural ventilation and, as the water travels over them, a vacuum is created and injects the air right into the water. The air reduces the wearing of the concrete as the massive amounts of water flow down the chute, thereby extending the operating life of the spillway and reducing maintenance costs."

Sounds like a concept that should be incorporated into all spillway designs?

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#13
In reply to #8

Re: pic of the day

03/15/2017 6:55 AM

I remember as a kid a spillway on a much smaller dam that had a thick coat of green moss (or whatever) growing on it. Get about a quarter inch of water flowing over it and it is a HUGE amount of fun. Best water slide I have ever been on in my life.

WARNING: don't ever try this on a dam with enough water on the spillway to get an undertow at the bottom. My home town lost 3 firefighters one day when they got caught in the undertow trying to rescue some stupid kids.

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#14
In reply to #13

Re: pic of the day

03/15/2017 3:52 PM

Man, those were the days! Where I was growing up we also had a concrete spillway on a creek diversion feeding into a lake, that was covered in that slick $hit. The moss strip was about 30 inches wide and about 70 feet long with a nice gentle flow of water, perfect for sliding! I had to pull 6 kids out of the bottom of it at different times. They see us older guys go down it standing up on our feet "surfing" so they would try it, fall, hit their head and knock themselves's out. One kid ended drowning when I wasn't there. It was alway's bitch bear trying to get them back up on dry concrete!

Anyhow, everything came to an end when some a$$hole put razor blades in the expansion joints The county came in and cut a nice 4"x3" channel down the middle of it, the full length then fenced it in. It was definitely fun while it lasted!

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#15
In reply to #14

Re: pic of the day

03/15/2017 6:44 PM

Or bobbing down a small wooden fish ladder all covered in the 'green stuff' at Camp Squanto.

If the Scoutmaster knew what we were doing, we'd been in big trouble.

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#16
In reply to #15

Re: pic of the day

03/15/2017 7:21 PM

There ain't anything worse than a bunch of haters! Especially when it's fun for some

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#12

Re: pic of the day

03/14/2017 8:50 PM

same area of erosion

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#17
In reply to #12

Re: pic of the day

03/16/2017 1:57 AM

Thanks for the posts and photos... But the images are so small I really can't see much of anything. I certainly can't read the URL. Are you aware that after adding images to your post, you can drag them out to the full width of the edit screen?

Perhaps better yet, after the image, post a link, so we can go see the originals at full detail.

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#18
In reply to #17

Re: pic of the day

03/16/2017 7:22 AM

some a Youtube screen captures from flyover video, so a link isn't really an option.

thanks for your comment

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#19
In reply to #18

Re: pic of the day

03/16/2017 11:20 AM

Here is a partial screen shot which was obtained from:

http://www.redding.com/story/news/local/2017/03/15/dredge-construction-work-continues-oroville-dam/99213690/

while the video was running. The image is larger in the Message window, than it is in CR4's preview window... This is apparently the largest permitted by CR4.

This was done on a Mac using the built-in screen capture function and Preview to save the result as a JPEG. I then went back to the browser to get the URL.

I assume there are equivalent functions on a PC.

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#20

Re: Pic Of The Day

03/16/2017 11:51 AM

OK, the remnants of the spillway are still there, but where did the dam go?...

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#21
In reply to #20

Re: Pic Of The Day

03/16/2017 12:01 PM

It didn't go anywhere. It's still totally intact, separated from the spillway by a granite hill. The dam is to the south, which is the right in photos looking up the spillway. An image has to be taken from fairly far away to show the dam and the spillway in the same photo.

Five of the electrical generators inside the dam are now back in operation.

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#22

Re: Pic Of The Day

03/16/2017 12:09 PM

Spillways are for use when the main outlet at the bottom is plugged. They are not intended to be used day after day. I doubt if any of the Colorado dam spillways have ever been used.

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#23
In reply to #22

Re: Pic Of The Day

03/16/2017 12:42 PM

Assuming you are referring to Hoover Dam, a test use of the spillways in 1941 caused erosion 45 feet deep. Then...

"During 1983, record flows into Lake Mead were recorded. The record surface elevation was recorded on July 24, with more than two feet of water spilling over the raised spillway gates of Nevada and Arizona. The record flows through the spillway tunnels again caused erosion in the concrete base, which had to be repaired. High water was responsible for wide spread damage throughout the project."

From https://www.usbr.gov/lc/hooverdam/history/essays/spillways.html

So damage to spillways is hardly a new discovery!

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#24
In reply to #23

Re: Pic Of The Day

03/16/2017 12:51 PM

it doesn't always flow to the dispersion pool at Hoover

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#25
In reply to #23

Re: Pic Of The Day

03/16/2017 12:52 PM

good post

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#26

And the saga continues at Oroville Dam

03/17/2017 2:50 PM

With the collapse of the main spillway and the eroded emergency spillway- Now they found Asbestos at the main spillway site. Well, at least they have plenty of water for dust control, with more on the way.

It will be interesting to see how their emergency repairs hold up during this next release down the main spillway starting today

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