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"Estimated horizontal" appears off. Based on the photo (post # 180 Orville Dam Drains Thread ) of the scaffolding in the spillway, assuming the scaffolding is vertical , true horizontal diverges from spillway top at ~ 15 degrees (+ - 2 degrees). The "estimated horizontal" diverges from the...

Re; Post #171 (Dierdre), "Dam Drains in Spillway..."Thread page 5 The link is post #1395(Boilermaker) page 35 in "Oroville Dam Spillway Failure". No privileges there to reply with. Did consult How To unsuccessfully. Apologies. It appears my comment is in the quote box and might be mistaken for...

On the main thread Boilermaker #1395 posted a photo that might depict a feature of interest. In the first photo taken downstream of the break in the spillway, from the center to the lower right (kayak left) there is a sharp transition in the underlying rocks from red-brown to gray. Additionally...

Well 24 hours x 60 minutes/hr = 1,440 minutes / day 25,000 truckloads / 1,440 truckloads / day = 17.36 days....if you can run 1 truck per minute ?(any thoughts on trucks/minute????) Basalt density might be closer to 3.0.

Might use of saddle dams explain some of the sudden inflow fluctuations in the hourly dam data over the past week?

All else aside, it seems a 12,000cfs flow for a very short time is at least an order of magnitude below a test that reflected storm inflow rates. I'm glad for what it has shown, but I also suspect more severe tests might show additional results.

Excellent find. Somewhere also is the data, mapping and likely cross sections from all that work. #1058 "....a. X-ray diffraction and solubility tests on clay gouge in shear planes." ???? What's this about???

Is it possible that different spectrum imagery, like radar (or others, thermal?....???) might "see" through the water flow, or at least the spray and splash, and give a clear picture of things visually obscured by water? If so what resolution? Also , I believe there is a technique called...

Hmmn, thanks for posting last year's curve for comparison . Both curves rise steeply. January start points of 2016 v. 2017 reveal (2016 ) 670' initial elevation and (2017) 725' initial elevation . Peak elevation (2016) reached in May. Perhaps representative of spring melt? After many dry years...

Based on the earlier posted cross section of the ogee weir(post #745), there is a 4' 0" facing of enriched concrete. Given that, it's shape and it's mass , it's recent short testing ,the concrete likely can handle large smooth flows well. The major unknown is what effect a river running down...

Again, excellent clear photo Mick. This photo clearly shows the differential erosional qualities of the "bedrock". The piles of orange talus fallen from above tell the whole story and the deep concern about how that would handle large flows for extended periods. The orientation of the fractures...

Re; #724 general consensus: Count me out on that one. It's unlikely in this situation, that loss of valuable water is driving decision making.My guess is that the top priority is to keep the dam functioning. These dams serve multiple purposes, two of which are flood control and irrigation. I...

Elevation is everything here. I do see bouyant debris that stopped there. reckon a photo at 902.5' lake elevation would give an excellent topographic bath tub ring. An oblique high resolution shot would probably show what's high ground.

Differences in inflow, outflow, etc. for the "same" flow likely to be result of different instruments, locations, or methods of measure (modeling v. gage, etc.). Not necessarily a bad thing as redundancy and multiple readings of the same thing is a handy tool for calibrating and verifying...

Thanks for pointing out the parking lot issue. Good eye. Missed that . Didn't have time to follow up earlier today . Agreed serious if goal is to release all water in a controlled fashion. Also agreed (that like all soils under flow and pressure,) the channel size can increase rapidly . Possible...

Thanks, Hmmn, guess it's time for a calculation on top 100' of reservoir capacity, just to file back in the databanks. That takes some of the uncertainty out of things. Very much appreciate your ultra clear geologic descriptions. Thanks metabunk, Lastly, anybody find any ultra-clear late...

Not to belabor a minor point, but both the 5cm depression and the earlier cite on the 5.7 quakes , and their probable cause are consistent with reservoir content having an effect (measurable in the first case) on underlaying rocks. Using conventional English , it appears the dam operations...

thanks on this. Is it a correct reading that, worst case , top 100' of reservoir flows out, dam preserved, below 801' elevation, remaining water retained, if all functions "safely"?

It sounds to me like they are describing the effect of reduced reservoir water mass on the underlaying or formally underlaying rocks i.e., "isostatic rebound" Check me on this please water engineers. (after

as a guess, and only a guess, and not a situation I'd care to make decisions based on guesses. If the spillway is not eroding anymore (and I do mean anymore! like ZERO, requires measurements, scale? inch, mm, ) it's conceivable that spillway flow could be increased, perhaps substantially. The...