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Concrete with rebar DOES hold together when it bends (at least enough to move air). Here is a video of an excavator shaking a concrete slab with rebar in it that has at least 4 large cracks in it where it is flopping around, but its still holding together (see especially starting at 10 seconds)...

Somewhat off topic, but I found that book (After 9-11: An Engineer's Work at the World Trade Center) at my local library and read it. It was (IMO) an interesting look into what it took to remove the remains of the buildings and the toll it took on the people who were working on the pile. Aaron Z

Hopefully no one was injured or killed: http://abc7ny.com/nypd-responds-to-report-of-explosion-at-port-authority-bus-terminal-/2768166/ Possible pipe bomb explodes below Port Authority Bus Terminal in Manhattan Eyewitness News Updated 10 mins ago MIDTOWN, Manhattan (WABC) -- The NYPD is...

Apparently, there were some errors in some of the citations so Bob Bea released a rev3: Happy Monday, this morning, i discovered i had made several mistakes in the revised report photograph attributions. i have corrected them and included the additional cited reference in the attached Rev3 of my...

Note that USB provides for up to 2 amps at 5VDC. Source, page 9 of: http://www.usb.org/developers/powerdelivery/PD_1.0_Introduction.pdf See also http://www.usb.org/developers/docs/devclass_docs/BCv1.2_070312.zip if you want to get into the nitty gritty. Aaron Z

He also emailed me a link to a PDF copy: Source: https://drive.google.com/file/d/0Bz1I1mIutSEnT3J5N2ZKUHQtNDQ/view I tried to upload it, but at 127MB, it wouldn't upload. I "printed" it with CutePDF and that dropped the size down to 60MB, but the forum still claimed that it was too big. I then...

I emailed the Center for Catastrophic Risk Management at UC Berkeley about this and got the following response (quoted verbatim from the email I received): Hi Aron Z, Rune Storesund (ccd this email) forwarded your email to me. you are correct about the source of the photographs you cited. i...

True, the original photo is from the DWR, but the additional lines should have been credited to sweepleader/Metabunk or he should have redone them with his own lines (I am fairly certain some of the other annotated pictures also came from here, but that one stuck out like a sore thumb). Aaron Z

One that stuck out like a sore thumb was page 18/11 (18 of the PDF, page numbered 11) which had the following picture: That appears that he took sweepleader's picture and added two text boxes: Is there another version of that document that has sources listed? If not, it might be interesting...

I would not bet on it. The contract packets are already out (with one amendment due to be added apparently) and they said that the info in them is not to be released to the public. That makes sense to me, perhaps they have had a "operational limit" (not announced, but set as an operational...

They could build a cofferdam in front of the gate structure to allow them to remove the gates even with water at the level of the gates (although, that could make flood control problematic if they got a heavy rainstorm). Aaron Z

Methinks the line will be "the old one was built to old standards, we are rebuilding to modern safer standards" If they are rebuilding the spillway with RCC from the solid rock on up, it shouldn't have the washout issues that building on fill did and it sounds like the spillway deck will be...

I suspect that is the implied message in "all work will be done to modern safety standards" Aaron Z

Video: https://www.facebook.com/CADWR/videos/vb.95205192448/10154585277742449/?type=3&theater (sorry, it doesn't seem to let me embed it) 12:47 - 270,000CFS through rebuilt upper spillway gates, historical max is 160,000 13:12 - More than one alternative plan to deal with unknown flows next...

Balkan, per the forum rules, you need to provide a link to the source of your picture. Aaron Z

Riprap is generally just good sized rock, the testing that the US Bureau of Reclamation did (for riprap to use to armor a dam in an area that will be overtopped) used rock ranging from ~2" to ~24": Pages 3-4 of https://www.usbr.gov/tsc/techreferences/hydraulics_lab/pubs/PAP/PAP-0790.pdf Tests...

Here is an ad for a 5 axle 2016 Mack GU713 truck with an 11 yard concrete mixer installed. It has a GVWR of 66,000# per the ad: http://www.brucknertruck.com/NewTrucks-Mack-GU713-39591 Based on the ad and the pictures, it appears to have a 20,000# GVW front axle, two 23,000# GVW drive axles, a...

If you look at the pictures with the water off (such as the one from your earlier post quoted below), it looks to me like there was a high spot in the dirt/rock right about where that stream of mud is coming from: At higher flows, the water goes out far enough to miss it (see around 0:20, or...

I am fairly certain that the drains are buried in the gravel outside the wall, so they are not visible from the outside and the pipes are protected. Aaron Z

It is not like they have been able to get close without risking getting washed downstream or sliding down the hill. Now that they have a road cut to the RH side of the main spillway (as evidenced by the backhoe up there on the pictures posted today), perhaps they will add some pictures there...