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  1. Scott Gates

    Pre-Failure Oroville Dam Spillway Historical Images

    CRM114's reddit image led me to the the Holy Grail page boys and girls ... a spectacular collection of construction images! https://www.facebook.com/groups/OrovilleDamBuilders/ Main spillway:
  2. Scott Gates

    Oroville Dam Spillway Failure

    Build a new, smaller auxiliary spillway control structure, or even a proper weir wall, in place of the flawed emergency spillway along the parking lot ... Build the control structure at the end of the existing 900' weir - where the parking lot part of spillway starts. As there is rock/dirt...
  3. Scott Gates

    Oroville Dam Drains in The Spillway Walls - How Do They Work?

    Except that a perforated drain pipe, with the even the top half embedded in concrete, would not let water get into it, let alone drain ... And yes the trench would need to be bigger than designed to accommodate gravel around the perforated pipe. Even if you mounded gravel over the pipe to...
  4. Scott Gates

    Oroville Dam Drains in The Spillway Walls - How Do They Work?

    This was addressed (page 93-94 of book or 145-146 of PDF): Various types of spillways were studied and modeled to arrive at the final structure. The original design consisted of a control structure with radial gates to pass the total spillway design flood. A short concrete apron was to extend...
  5. Scott Gates

    Oroville Dam Drains in The Spillway Walls - How Do They Work?

    There would be seemingly little point to a drain located IN the slab, or even inset partway in the slab. It weakens the slab (less thickness) and doesn't allow drainage ... perforated pipe is perforated on top side with solid bottom to allow flow in the pipe. And the point is to draw moisture...
  6. Scott Gates

    Oroville Dam Drains in The Spillway Walls - How Do They Work?

    I agree as noted in a comment above ... the poly would likely only cover the width of the pipe and adjacent gravel blanket - would seem water would simply drain down slope, past the poly and to the next drain
  7. Scott Gates

    Oroville Dam Drains in The Spillway Walls - How Do They Work?

    What is the source for this graphic?
  8. Scott Gates

    Pre-Failure Oroville Dam Spillway Historical Images

    Yep ... I started the post this afternoon and didn't get around to finishing til later ... I shoulda refreshed ;-)
  9. Scott Gates

    Pre-Failure Oroville Dam Spillway Historical Images

    Saw mentioned somewhere that 2015 report noted tree located close to spillway wall they recommended be removed ... This sure looks like could be that tree ... 'trees like water' ... and this one is close to wall and taller than nearby. It also appears almost exactly where the the...
  10. Scott Gates

    Pre-Failure Oroville Dam Spillway Historical Images

    Could have been wave action as well ...
  11. Scott Gates

    Oroville Dam Spillway Failure

    The green area experienced minimal erosion. And much of it was already hardened in the past - for example the grouted rock at the bottom of green area. The rest of the green area has already been armored and crushed gravel base put down on top of it as a cap and driving surface for truck...
  12. Scott Gates

    Oroville Dam Spillway Failure

    If there was credible evidence to support these claims I would agree. But there is not. All of the evidence available - plans, construction information, and current physical evidence all support they were knowledgeable, compete and accurate. A cut in an eroded area of weathered rock nearly 300...
  13. Scott Gates

    Oroville Dam Spillway Failure

    Theoretical assertion is always trumped by onsite actual data. And the onsite data shows the seams of non-competent are narrow and run vertically in the area. They would be clearly apparent to any competent engineer of the time. And the record indeed shows they were well aware of and addressed...
  14. Scott Gates

    Oroville Dam Spillway Failure

    1.) There was no boil. When first notices the erosions was moving fairly rapidly, back cutting toward the weir. That said numerous media reports identified the authorities quickly noting, just after the evac order was given, thet the back cutting had slowed significantly or stopped - which is...
  15. Scott Gates

    Oroville Dam Spillway Failure

    And the professionals involved in the years long design, and construction, would be oblivious to this?
  16. Scott Gates

    Oroville Dam Spillway Failure

    Where does the idea the tunnels would have been under the parking lot and spillway ... the uncompleted intakes are to the dam side of the main spillway .... and, according to plans were not intended to go anywhere near the parking lot? The ripping would, presumably have been to remove the...
  17. Scott Gates

    Oroville Dam Spillway Failure

    My 2 cents as someone new here ... this continues to be an evolving discussion ... I want to be able to continue to research and follow the situation - about the emergency weir and the improvements and repairs made and being made regarding it ... this remains a current evolving event that is far...
  18. Scott Gates

    Oroville Dam Spillway Failure

    That isn't the problem - it is the road across the main spillway to get to the emergency spillway side and the haul road onto the emergency spillway bench ...
  19. Scott Gates

    Oroville Dam Spillway Failure

    As of 2/16 ... much more done since ...
  20. Scott Gates

    Oroville Dam Spillway Failure

    The erosion area above the red circle is fully filled and armored with concrete. It was filled over the course of a couple days last week. Pretty much the entire area from the emergency weir to the access road is filled and hardened with concrete. Plus what the accomplished yesterday and...
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