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  1. Pozzolith

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

    A better picture of that detail. https://www.usbr.gov/tsc/techreferences/hydraulics_lab/pubs/HYD/HYD-510.pdf pg 172 of 193 dwg A-389-4
  2. Pozzolith

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

    https://pixel-ca-dwr.photoshelter.c...mDTx48Y/I0000e_s_NS5UuRM/FL-Oroville-7745-jpg Also, note the collection drains.
  3. Pozzolith

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

    A screengrab from the KCRA live video. On the left, drainage from the collection drain. In the center, what appears to be a piece of VCP drain. In some of the live shots, the piece in the center was clearly visible. Also, on the right, the collection drain was sometimes clearly visible.
  4. Pozzolith

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

    This is the dwg that I most want to see. On your first point, the wall outlets are located in the top half of the wall, and would necessarily have to connect to the exterior collection drain considerably upstream from the outlet. If the collection pipe runs alongside the wall footing at its...
  5. Pozzolith

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

    Some more important details from dwg A-389-4 that answer some questions. https://www.usbr.gov/tsc/techreferences/hydraulics_lab/pubs/HYD/HYD-510.pdf (page 151) Here, we learn that the longitudinal contraction joints are 20'-0" wide and the wall footing extends 9'-4" into the chute. From...
  6. Pozzolith

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

    Best I can see after blowing up the PDF, it looks to be 1/2". It looks like the edge of the slab downstream of the expansion joint is feathered 1/2" below that of the upstream edge for a 6" distance. Perhaps to be sure not to present an upraised edge to the flowing water?
  7. Pozzolith

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

    Here is the detail of the longitudinal joint. It is keyed with no dowel or bar. Detail M shows sealant installed. This is from dwg A-389-4 Here is the complete dwg. https://www.usbr.gov/tsc/techreferences/hydraulics_lab/pubs/HYD/HYD-510.pdf
  8. Pozzolith

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

    I looked through those dwgs the other day and went right past that joint detail. That dowel bar is close to the bottom. If the gravel base were eroded, load transfer at the joint could spall the concrete off below the bar.
  9. Pozzolith

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

    This is from a do-it-yourself website, but I would think the principle would be the same. Basically, a network of 'French Drains' beneath the slab that drain into collection pipes on either side of the spillway...
  10. Pozzolith

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

    This photo seems to show keyways at the longitudinal slab joints. Also, there is no evidence of rebar or dowel bars connecting to the adjacent slab.
  11. Pozzolith

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

    That would be logical. A clay pipe system would have literally dozens of joints on each branch, and then more joints at each inlet/outlet to the collection drain. When settling occurs, leaks follow.
  12. Pozzolith

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

    This is a section cut through the spillway wall. That looks like the 12" longitudinal drain running along the wall footer.
  13. Pozzolith

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

    http://www.naylor.co.uk/wp-content/uploads/2014/12/NEW-Clay-Drainage-0616.pdf If the drainage system used clay pipe, that might explain why no drain lines have been seen so far in the spillway rubble. Broken clay pipe would be indistinguishable from fractured rock.
  14. Pozzolith

    Oroville Dam Main Spillway Waterfall Erosion Watch

    Here is a live view of the main spillway. https://www.facebook.com/FoxNews/videos/vb.15704546335/10155128737211336/?type=3&theater
  15. Pozzolith

    Oroville Watershed Weather Forecast, Lake Level and Inflow Calculations

    In another life, I used to do project estimating for a construction company. I always thought construction 'estimating' was similar to weather 'forcasting.' My bosses would sometimes ask "We want to know how much this project will cost when complete." I always told them if I knew, it wouldn't...
  16. Pozzolith

    Pre-Failure Oroville Dam Spillway Historical Images

    Some information about joints in concrete slabs from the Federal Highway Administration. https://www.fhwa.dot.gov/pavement/t504030.cfm Technical Advisory T 5040.30 Concrete Pavement Joints The performance of concrete pavements depends to a large extent upon the satisfactory performance of the...
  17. Pozzolith

    Oroville Dam Spillway Failure

    Here is an interesting 3d dwg of the area. https://sketchfab.com/models/a2e069b5196945b79d9487c2730cbcac
  18. Pozzolith

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

    I'll wager that 30 minutes after the spillway failure occurred, the DWR people had the drawings of the drainage system pulled up on every computer in the office, and they were all pondering the very same questions we are today.
  19. Pozzolith

    Oroville Dam Spillway Failure

    Here are the pdf's of the plan and elevation drawings of the spillway https://lincolnparishnewsonline.files.wordpress.com/2017/02/plan-elev.pdf
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