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That's pretty rough. Keeping in mind the longitudinal drain is closer to the wall than the vertical or horizontal runs, it appears the horizontal branches off the outside of the longitudinal, then the vertical wyes into the horizontal. Use of a wye to branch off the horizontal drain from the...

I can't see any significant difference in slope between the line I estimated and the pencil line. Recognizing my coarse methods, I cannot tell whether the pencil line is actual horizontal (as could easily be laid out w bubble levels) or is the desired drain line slope. Either way there is not...

Here's my best photogrammetry -- The horizontals are spaced to what appear to be plywood form lines at 4 ft; also consistent with 20 ft tall wall. In Post #42 I estimated fence pole spacing at 10 ft. This places the vertical slab lines on 25 ft centers. Downhill from the change in spillway...

The drawings in the CA State Water Project report (https://archive.org/stream/zh9californiastatew2003calirich#page/96/mode/1up) appear to indicate the longitudinal drains run in the exterior corner between the wall and slab.

My prior post erroneously assumed facts not in evidence. Was the concrete poured directly on the bare rock cut or was there an intervening fill to bring up the low spots in the uneven rock cut? Fill would be bad for possible downhill shifting. Uneven bare rock could provide some "tooth" which...

i apologize for lack of picture but I am on road w only tablet. In a prior post i referred to the concrete under the sidewall as a "footing". That is inaccurate. A footing has a horizontal surface on the bottom to support loads without those loads generating sliding forces. This especially...

The dots on the curve are the Stations and Elevations from the spillway profile. They are not related to discharge port locations.

In general I agree. Over the past few days I have been regretting my prior statements about those high outflows must be pressure driven. It is possible (likely?) those high exit velocities are merely due to high velocities -- free stream, not full pipe section. (Also my earlier comments re...

Drain spacing purportedly at about 20 ft. I previously estimated slab length at 52 ft. These spacings seem approximately consistent. Possible variation in spacing between drainlines. Drain channel shape consistent with prior photos. Appears to be simple box form over drainline. There was a...

Can anyone help decode the Notes on that drawing? NOTES 1. See A-??? for concrete notes See A-??? for general reinforcement notes 2. See A-??? for excavation details 3. Sections shown on this sheet are typical showing ??? ?? of different situations 4. Formed wall contr??? and ??? ??? ??? not...

It appears to me that the sections in the upper right show the collector drain along the sidewall.

The herringbone spacing would be different if measured in horizontal plane (plan view) vs in local plane of spillway. That prompted me to try to extract data from the drawings. Some of the numbers are hard to read. I typed the readable values into a spreadsheet and plotted them, then...

Because the herringbone is at an angle to the wall, the notch distance on the wall would be larger than the distance between the pipes (perpendicular to the herringbone). I have not done the trig but the pipe spacing could be 20 ft. The side wall distance could be used to estimate the angle of...

It looks like the bottom slabs used step joints where one slab overlapped the other. The depth of the step was only about six inches. More worrisome -- where the slabs are broken, the rebar appears pristine and there is much damage to the concrete -- the rebar did its job. But at the joints...

Apparently not an overly dense pattern of core drills near the spillway Note the "EXPLANATION" in the bottom right that shows the symbols for the core samples. https://ia800302.us.archive.org/3/items/zh9californiastatew2003calirich/zh9californiastatew2003calirich.pdf Document page 94 (pg 146...

Much of possible interest in this picture... The footer varies significantly in width (thin arrows), to the extent that the long bolts(?) at bottom left lie along the side of the footer instead of going through the footer (circled in yellow). Seems odd. Indicative of sloppy work // poor...

The concrete form lines can be seen on this photo. (Anyone able to download the full res photos from DWR? I get a message saying to contact them to download.) http://pixel-ca-dwr.photoshelter.com/galleries/C0000OxvlgXg3yfg/G00003YCcmDTx48Y/I0000kN9PORvuykE/KG-oro-spillway-damage-10060-jpg...

What is this? http://pixel-ca-dwr.photoshelter.com/galleries/C0000OxvlgXg3yfg/G00003YCcmDTx48Y/I0000p1.rqHqeHzk/BSB-6369 And here ... http://pixel-ca-dwr.photoshelter.com/galleries/C0000OxvlgXg3yfg/G00003YCcmDTx48Y/I0000f2T6yyciD4Y/BSB-6369 One of these for every side drain...

Here is the picture -- I think we are in general agreement. My comment was intended to provide evidence the side openings must be connected to piping that is feeding them with water that is pressurized by the elevation difference along the pipe. (I think this is consistent with your...