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Posts by EarthResearcher333

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  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    01/05/2018 11:51:53 PM PST · 4,467 of 4,538
    EarthResearcher333 to The Westerner; KC Burke
    -- Repost: as a CC:

    Hi Repeal the 17th,

    Greetings. Happy New year. I haven't spoken much on the new IFT report. Let's say that the independent forensic team (originators) on this report were very diplomatic. However, there is deeper information that, if revealed, can create a big stink bomb.

    IF this info were to be made public, it could affect the integrity of the IFT report (either someone missed important docs or ?). It pertains to Fig A-30 (Appendix A) and pages in Appendix G.

  • Human error played a role in Oroville Dam spillway failure, report finds

    01/05/2018 11:49:01 PM PST · 26 of 32
    EarthResearcher333 to Repeal The 17th
    Hi Repeal the 17th,

    Greetings. Happy New year. I haven't spoken much on the new IFT report. Let's say that the independent forensic team (originators) on this report were very diplomatic. However, there is deeper information that, if revealed, can create a big stink bomb.

    IF this info were to be made public, it could affect the integrity of the IFT report (either someone missed important docs or ?). It pertains to Fig A-30 (Appendix A) and pages in Appendix G.

    Will post this over on the big thread as a cc.

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    01/05/2018 2:39:20 PM PST · 4,463 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    The new Independent Forensic Team's (IFT) report has just been published today (Jan 5, 2018). DWR was pushing to get FERC to grant them their 50 year licensing renewal about a couple of weeks ago (was in the news).

    I've read through the IFT report today. Watch for news articles to come out after it is digested and reviewed.

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/12/2017 5:37:26 AM PST · 4,455 of 4,538
    EarthResearcher333 to mad_as_he$$
    You found a key to the problem.... someone had a duty to QC the conditions in the midst of the construction. Here is the "revealing" critical line in the DWR report:

    ---------

    Cracking could also have been a result of plastic shrinkage, “usually associated with the rapid loss of moisture caused by a combination of factors that include high air and concrete temperatures, low relative humidity, and high wind velocity at the surface of the concrete.”*

    ---------

    *(exact weather patterns/extremes at Oroville during construction)

    This official statement directly infers that QC DID NOT know these variables during construction (or was poorly monitoring them).

    This was DWR's responsibility. The other responsibility was QC feed back to Kiewit on early problems. Then it was a combined responsibility to figure out the proper action(s) (Mix? QC? or too late by then?).

    Other nagging question(s)... Why was it that FERC was the one to officially discover this cracking? (FERC immediately asked DWR to explain the cracks & have DWR explain why).

    Why didn't DWR notify FERC first? Did DWR think it wasn't anything to worry about? (competency? miscommunications? PR concerns?).

    DWR has another town hall coming up..... Like abb said "This aint going to end well".

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/12/2017 4:29:23 AM PST · 4,452 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    DWR releases CEII "Crack" report - Shows full thickness Slab cracks - other extensive crack patterns - tried to fix in mix ratios during construction

    New details & photographs are now coming out on the Oroville Spillway Cracks. These "cracks" are extensive and photos show that some go fully through the thickness of the slabs. (see report and photos)

    Perhaps the most significant question, which becomes rhetorical, is "If you knew that it was going to crack as it did, why didn't you use epoxy coated rebar in the lower slab layer?". Simply answering this question is "have you stopped beating your wife" trap. Either DWR knew it was going to crack to the full slab thickness and DWR didn't consider the long term implications of corrosion of the lower rebar - OR - DWR didn't know it was going to crack through the full slab thickness and DWR believed they didn't have to use epoxy coated rebar in the lower layer.

    Prof. Robert Bea has been unfairly criticized in other media. Yet the new report buttresses the concerns originally stated by Prof Bea. Massive Oil well structures, constructed of concrete, and within a saltwater environment, requires important specifications to insure a pure intolerance for cracking. These structures also have deal with anchorage stresses for lateral high storm conditions (seas) and including the footing stresses.

    Some early youtube shots of the new spillway show water flowing up these cracks to the slab surface. This "water exposure" demonstrates that the slab to base concrete mating surface is resisting in flow routes to the nearest drain(s). Thus "corrosion" of the lower rebar is a given risk from the reported near 200 cracks (plus the unseen ones). This is highly unfortunate. (Rhetorical again ->) IF they were expecting these cracks, they should have used epoxy coated rebar in the lower slab layer as they did in the upper layer rebar (used green epoxy coated rebar in the upper layer).

    Of note: Notice the use of uncertain terms in the report (i.e. "theory", "could have", "likely caused"..). These terms wouldn't be used IF DWR fully expected the cracking outcome if you listen to the recent explanations given to the public.

    Newly classified CEII report released (with a noted full page or pages "attachment" redaction):

    http://www.water.ca.gov/oroville-spillway/pdf/2017/20171102_DWR_TM_SRT-FCO-DOC-09_CEII%20Redacted_Att1.pdf

    --- Article (link below) clips: (emphasis mine)

    Brown wrote that most of the cracking was likely caused by the vast amount of restraints, including the underlying leveling concrete and slab anchors. That theory was supported by mapping which showed most of the cracks between anchors, he said. Thermal shrinkage could also have been a contributor, though not likely the main reason because the difference in temperature between the top and interior of concrete panels was negligible, according to the report.

    Cracking could also have been a result of plastic shrinkage, “usually associated with the rapid loss of moisture caused by a combination of factors that include high air and concrete temperatures, low relative humidity, and high wind velocity at the surface of the concrete.”

    In that case, what begins as shallow cracks can turn into deep cracks later, according to the American Concrete Institute, which Brown cited in the report. At the end of the memo, it states that the department would expand its investigation into the cracks and look into modifying the curing process or making changes to the concrete mix, such as using shrinkage-reducing admixtures, which Assistant Professor Feraidon Ataie, director of Chico State University’s concrete industry management program, suggested in a previous interview with this newspaper.

    Professor Robert Bea with U.C. Berkeley’s Center for Catastrophic Risk management said on Monday he found two of the pictures, figures one and three in the report which show thin and long breaks in the concrete, significant and “very scary.”

    “I hope no one will believe that this type of cracking — not the crazing at the surface of the concrete — is ‘to be expected,’” Bea wrote in an email. “I have helped design, construct, operate, and maintain some very large reinforced concrete structures. These structures had many more ‘restraints’ than the re-constructed spillway. Significant cracking was not tolerated. If found, it was immediately ‘fixed’ and then monitored to be sure that the ‘fix’ had been effective.”

    A DWR spokesperson could not be reached for comment before the deadline for this story.

    --- end clips more at link

    Article: Oroville Dam: Formerly classified memo describing spillway cracks now public

    http://www.chicoer.com/general-news/20171211/oroville-dam-formerly-classified-memo-describing-spillway-cracks-now-public

    Newly released CEII doc by DWR - shows extent of areas of "cracking" - photo of new slab surface.


    Newly released CEII doc by DWR: Full thickness Cracking in new slab - exposure risk to corrosion of unprotected lower rebar layer from upward penetrating water.


  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/12/2017 4:13:45 AM PST · 4,451 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    Town Hall turns into "Screaming match" over Cracks

    Article clips ------

    Oroville Dam neighbors and downstream residents blasted California officials for claiming they should not worry about hundreds of cracks in the newly reconstructed dam spillway.

    The California Department of Water Resources (DWR) public presentation to City of Oroville and downstream Feather River residents deteriorated into a screaming match after the state’s dam experts tried to reassure the community that there was nothing to see in the string of hairline cracks that have developed just weeks after finishing the $275 million first phase of rebuilding of the dam’s spillways.

    Residents hammered the DWR with complaints, asking why they ought to believe the State of California after officials were not honest with the community regarding the breadth of safety problems that were known for almost a decade.

    But the Sacramento Bee reported in late November that that cracks were first detected in September “when the first phase was nearing completion.” The Federal Energy Regulatory Commission (FERC), which has federal oversight over the California-owned dam, instructed DWR on October 2 to investigate “cracking of the erosion resistant concrete” and to recommend any further steps necessary to address infrastructure risks.

    ….

    But KQED reported last week that Robert Bea, professor emeritus of civil engineering and founder of the respected UC Berkeley Center for Catastrophic Risk Management, stated: “Cracking in high-strength reinforced concrete structures is never to be expected.” He added that when large volumes of water cascade down the spillway at speeds approaching 90 miles per hour, even small cracks can increase stresses on concrete.

    ---- end clips more at link

    Oroville Dam Neighbors Fear Hundreds of New Spillway Cracks

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/01/2017 9:00:32 PM PST · 4,450 of 4,538
    EarthResearcher333 to The Westerner
    All I can say is that FERC was correct in their surprise and reasons for asking DWR for an explanation. One of the articles mentioned that DWR was planning on holding some community meetings due to the controversy or surprise of what the AP discovered in FERC to DWR communication letters (only gleaning info from the subject "cover letters" on FERC's database).
  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/01/2017 10:29:19 AM PST · 4,447 of 4,538
    EarthResearcher333 to KC Burke
    I have access to information that I cannot share publicly. There is more to this story and there are affirmations that confirm what was said (individual).

    I must maintain confidentiality on this matter.

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/01/2017 8:35:32 AM PST · 4,444 of 4,538
    EarthResearcher333 to KC Burke
    The Key "Reveal" to this situation is what Peterson from Kiewit noted to sfgate:

    "Adjusting the concrete mixture could reduce the number of cracks, Petersen said, but experts need to be careful not to reduce the concrete's strength."

    Apparently, FERC is the one that discovered these cracks and then asked DWR to explain it. This begs the question of "why didn't DWR find it first?".

    The concrete in question is the special mix "erosion resistant" concrete. By Peterson discussing an option of "adjusting the concrete mixture" reveals that there is some "tuning" that may have been in the design bedrock anchoring/settling assumptions.

    OR - there were "unknown" "unknowns" regarding the geologic bedrock settling. Either way, it is truly a PR mess. The mayor is angry. The citizens are now alarmed. And it's possible that DWR may have "fumbled" this from a PR/communications standpoint.

    Best to be open and up front early on, just as how the Corps handled the collapsed gate failure at Folsum Dam.

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/01/2017 6:50:38 AM PST · 4,441 of 4,538
    EarthResearcher333 to EarthResearcher333
    Oroville mayor lashes out over dam communications

    -- clip: SACRAMENTO, Calif. (AP) — Oroville's mayor said Thursday she knew about cracks in the replacement spillway at the troubled dam nearby and is not concerned, but heaped criticism on state water officials for failing to communicate with her town.

    Linda Dahlmeier said the Department of Water Resources should have proactively communicated that cracks were expected but has instead created a "firestorm" in a community that was rattled by sudden evacuation orders last February. Nearly 200,000 people were forced to flee when engineers feared that damaged spillways at Oroville Dam would unleash an uncontrolled wall of water that would inundate her town and others downstream. The crisis was averted.

    ...

    Many residents of Oroville don't trust what they're hearing from the Department of Water Resources, she said, and officials in the agency's Sacramento headquarters have failed to address the concerns of people living in the shadow of the nation's tallest dam.

    ... "cracks in the hundreds"...

    --- end clips more at link http://www.sfgate.com/news/article/Oroville-mayor-lashes-out-over-dam-communications-12396585.php

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/01/2017 6:45:16 AM PST · 4,440 of 4,538
    EarthResearcher333 to EarthResearcher333
    "Jeff Petersen, Kiewit’s project manager, told The Sacramento Bee that anchoring the slabs to the foundation beneath the spillway, a key design element intended to strengthen the overall structure, contributed to the cracking but doesn’t harm the integrity of the chute."

    http://www.sacbee.com/news/state/california/water-and-drought/article186945568.html

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    12/01/2017 6:41:40 AM PST · 4,439 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    Cracks found in Main Spillway - FERC notified - Kiewit Monitoring - Some say shouldn't happen

    IN a potential blow to PR, news of hairline cracks have been discovered on the new massive main spillway concrete. CCRM expert Prof Bea says that "cracking in high-strength reinforced concrete structures is never expected."

    DWR swiftly notified FERC of the cracking in the spillway concrete. For now, until more information is provided, the "sources" to this situation rest upon DWR and FERC.

    Another potential hit to PR: Information pieces from the IFT findings were revealed by DWR's chief engineer Jeanne Kuttel on the original design deficiencies of the main spillway. Noted is the comment of "low-quality rocks".

    However, the original Final Geology report noted the highly erosion prone substructure areas were in fact "clay". Many images of Kiewit workers extracting this "clay" during the new spillway construction reveal a "conflict" with the usage of the term "low-quality rocks".

    "In fact, the independent forensic team points to several physical causes for the erosion (in February)," she said. "Thin concrete overlying the drains, a drainage system with deficiencies, a single layer of nominal reinforcement and shallow anchorages and low-quality rocks."

    ----Article clips:

    Earlier this week, the Associated Press first reported that small cracks have appeared in the brand-new concrete spillway.

    University of California, Berkeley, civil engineering professor Robert Bea said cracking in high-strength reinforced concrete structures is never expected.

    Kiewit project director Jeff Petersen said this kind of cracking does occur in projects of this size as the concrete dries.

    "It's important to understand that it's physical property of the concrete during the curing process to shrink slightly, which leads to internal stresses and therefore is normal for concrete to crack to relieve the stress," he said. "These hairline cracks do not in any way affect the structural integrity of the spillway."

    ….

    DWR chief engineer Jeanne Kuttel said the agency promptly notified the Federal Energy Regulatory Commission about the hairline cracks. The agency will be monitoring the cracks through the rainy season and next year's construction season.

    "When DWR noticed the hairline cracks in the newly reconstructed slab, we proactively notified FERC that we were putting together a monitoring program and following up on that," she said.

    --- end clips more at link

    DWR: Hairline cracks in Oroville spillway normal in massive concrete projects

    http://www.kcra.com/article/dwr-hairline-cracks-in-oroville-spillway-normal-in-massive-concrete-projects/13990004

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/24/2017 8:18:42 AM PST · 4,437 of 4,538
    EarthResearcher333 to The Westerner

    Happy Thanksgiving,
    I’m waiting for the new events to unfold. Of particular, the release of the Independent Forensics Team final report.

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/09/2017 7:25:36 PM PST · 4,435 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    Update on Guajataca Dam - Navy MH53's drop concrete barrier blocks - Spillway erosion mitigation

    Images from a video where US Navy MH53 large helicopters are doing emergency drops of material to mitigate the erosion of the destroyed spillway. Hurricane Maria caused the dam to overflow into its designed overflow emergency spillway.

    The photos reveal the extent of the erosion and the movement of sections of the back section of the earthen dam from the destabilizing erosion after the concrete spillway fell apart. Emergency Repair work is being coordinated by on-site US Army Corps of Engineers.

    Youtube of repairwork: https://www.youtube.com/watch?v=l9IZtnZ-4-I

    https://www.youtube.com/watch?v=l9IZtnZ-4-I Navy MH53's placing barriers down for emergency stop-gap repair to the broken and eroded spillway at Guajataca Dam in Puerto Rico.


    Concrete drop zone to enact repairs to mitigate further erosion of the backside overflow spillway.


    Navy MH53 lifting new concrete barrier to drop into erosion area of spillway at Guajataca Dam in Puerto Rico. Rows of concrete barriers set up on the road for sequential lift-drop cycles.


  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/06/2017 5:09:55 PM PST · 4,434 of 4,538
    EarthResearcher333 to Bobsvainbabblings; abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; ...
    Rains at Oroville Spillway - Nov 3, 2017

    Hi BVB, Thanks for the link. DWR recently noted that the crane in the spillway was going to be disassembled and the pieces trucked out through the gates. I'll bet the workers would prefer the nice dry weather they've had until recently (for this task).


  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/04/2017 3:02:29 AM PDT · 4,431 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    Insights into Aerator design - Air Duct & Box Column Injector via differential pressure - Crane removal of Excavator

    Extracting from fluid flow dynamics...these photos reveal key features of the Aerator air injection design. The spillway water flow will "fall" in a curve from the upper lip as the flow has a given inertial velocity. This forms a lower pressure cavity region at the face of the vertical lip. Using this low pressure formation, the placement of an "air vent" at this low pressure area facilitates a volume of air to be drawn into the crease region or the face region of the vertical step.

    This natural energy powered arrangement is formed as the air vent is part of a hollow box concrete column. The column is the inlet to the air. Not sure from he shadows of the concrete inlet if column has an internal taper to the "box" outline into the smaller area of the "air vent". This is important to insure a clean laminar airflow while avoiding a resonant pulsation effect. A non-tapered "bottom" design could resonate a bit like a church organ pipe and hinder the intended maximum airflow injection & pressure. Overall, a simple and elegant design. If it does resonate with "pulsations", the acoustics of this may be interesting, but not amusing to the nearby homeowners to the dam.

    Another feature is observed in a special pour of "rough surface" concrete at the sidewall at the Aerator lip. This "rough surface" will induce a turbulence to the sidewall surface water flow - most likely to prevent vortices from forming at the post drop lip sidewall. This is a similar effect type of design used in aircraft wings where little metal tabs are spaced along a section of the wing to keep the airflow from separating from the wing's surface (forming oscillatory vortices and destabilizing lift/control/efficiency).

    The main goal of an Aerator design is to inject as much air bubbles as efficiently as possible without creating disruptive oscillatory conditions, pulsations, or vortices. It will be interesting to see how far the air penetrates in the crease region to the center regions of the spillway.

    Note: Answer on the "large crane" in the spillway - DWR revealed in a recent press update that Kiewit will disassemble the crane in the spillway and truck out the crane components through the Gates. No mention of the "trucking out timeframe" considering the curing of the fresh patchwork on the Upper Spillway. It's possible that plates may laid down to drive over any "patches" still in any sensitive curing window from any tire weight distribution. I guess DWR is not as concerned now about PR of getting the crane out quickly.

    Crane lifting out Small Excavator - Nov 1. Note the custom "rough surface" concrete on the sidewall at the Aerator transition slab - plus the Aerator "Air Injection" vent at the RCC level.


    Closer view of the custom "rough surface" concrete and the lighting shadows revealing the "Air Injection" vent at the sidewall lip of the Aerator lift. Air will be pulled into and underneath the "curved fall" of the spillway waterflow. Hollow "box column" allows a volume of Air to flow down into this vent via "differential pressure" formation.


  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/02/2017 10:37:34 PM PDT · 4,427 of 4,538
    EarthResearcher333 to Jim 0216
    I trust Kiewit in their engineering. Kiewit accomplished a herculean project considering they had a significant increase in the total excavation & concrete fill work to put this spillway on bedrock (like it should have been done in the first place).

    Without Kiewit's expertise, project/materials management, coordination, workforce leveraging, engineering skills, and talent, I do not believe that DWR could have accomplished this feat if DWR tried to fill these roles as the prime contractor. In essence, Kiewit "carried" DWR through this.

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/02/2017 10:21:50 PM PDT · 4,426 of 4,538
    EarthResearcher333 to marmaly

    Not a problem...Gave me an excuse to see what the track width was on these big machines.

  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/02/2017 1:00:20 AM PDT · 4,423 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    DWR statement - Nov 1 - Stating "They Met the Deadline"

    ----- DWR Statement: (emphasis mine)

    An aerial view of the Lake Oroville spillways recovery site in Butte County, California. The California Department of Water Resources (DWR) met its November 1, 2017 goal of replacing the lower chute and sections of the upper chute of the flood control spillway and placing roller-compacted concrete in the erosion area, allowing the flood control spillway to handle flows of 100,000 cubic feet per second for the coming winter season. Construction will continue after the November 1 milestone, focusing on site cleanup and the completion of the emergency spillway’s underground secant pile wall. During the second phase of construction in 2018, DWR will place additional structural concrete on the flood control spillway and complete the emergency spillway buttress and splashpad. Photo taken November 01, 2017.

    ---- end Statement

    Yet to be removed from the spillway: Large Crane, RCC compactor head Excavator, Sidewall panels, 10 large concrete "barriers" at RCC lower transition slab, concrete coverings, miscellaneous scaffolding and equipment. Notice the "gathering" for a photo-op at the Aerator Transition Slab.


  • Emergency: California’s Oroville Dam Spillway Near Failure, Evacuations Ordered

    11/02/2017 12:07:44 AM PDT · 4,422 of 4,538
    EarthResearcher333 to abb; meyer; Repeal The 17th; KC Burke; janetjanet998; Jim 0216; Ray76; EternalHope; ...
    Kiewit Finishing Up Placing Last Section of Enriched RCC Nov 1 - Lots of "clear out" work to be done In Upper Spillway