[meyer]

I’ll have to study that image for a bit to get my bearings straight. Great information as usual. Doing the preventive investigation that the DWR won’t do.

[meyer]

New images have been added to their page...

https://pixel-ca-dwr.photoshelter.com/galleries/C0000OxvlgXg3yfg/G00003YCcmDTx48Y/I0000kX.qAevmpGk/MB-Oroville-1428-05-01-2017-jpg

It’s interesting to note that the water appears to be much clearer at reduced flow than it has been the previous 2 times that they shut down the spillway.

[EarthResearcher333]

Hi meyer, This illustrated blueprint should help understand the prior "early construction" and hillside trench excavation picture. The original picture upthread is a side view looking at the "length" of the crest of the "future" dam from the NorthWest side. Turns out this aligns with the same view in the original blueprint drawings. The aspect ratio of the blueprint drawings are elongated in the canyon wall upslope/downslope view. Thus, the perspective of the steepness of the left abutment slope is masked. Also, this cross section of the upslope/downslope view of the canyon is the "trench" slope excavation final sloping. A large abutment of rock had to be blasted away to form the a smooth upward slope junction to the core block. However, the steep left abutment slope remained and is not part of this blueprint elevation drawing. The drawing only shows the "trench" elevation progression. Look at the upthread picture and see the sharp "hole" or drop off downstream of the junction of the "trench".

Original Blueprint of the Earthen Dam - marked up with notes on features of the compacted Zone Fill design - Clayey core material deposited in 10 inch lifts & compacted "to a density -by weight- equal or better than concrete" (pre-hydrated for "consolidation" compaction). Zone 3 Shell layer deposited in 2 ft lifts & compacted.