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Very very interesting - this version seems to be the full version (without redactions), e.g. compare the text to Boilermakers post #102. Maybe that is part of the reason the memo has disappeared

I'll state the obvious - I don't think they will be able to clear all that material by Thursday. More feasibly, they need to enlarge the channel enough so that upstream and downstream water levels equalise (more or less), even when they get the powerplant running. If the channel is big enough...

Sorry, only the last gate is open at around 1hr06 (29:49 remaining) shown by the white plume on the right side of the immediate downstream face of the intake gates (there are closer shots of gates just before this): By around 1hr09 (26:31 remaining) that white plume has disappeared, from which...

At about 1:13 in the video the camera zooms in to what I think is the bit you've circled and it then breaks off and is carried away downstream (blue circle in image below). The red circle shows what looks like another smaller diameter pipe or bar sticking out - as Deirdre has just circled

What struck me watching that video is how long the flow at the bottom of the spillway continued after the intake gates were fully closed, i.e. flow was being sustained entirely by what was coming out of the drains. Obviously the flow was much lower than when the gates were open but was still a...

Lots of really good pictures there, thanks for the link. Here are a couple more of interest. View up the spillway from the river (maybe someone clever can do a comparison to the view now?): Intersting view of emergency spillway weir mid construction:

Yes. I crudely increased the inflow by 7% to get the volume balance right (average of around 5000 cfs). As others have noted, there will always be uncertainty (margin of error) in the recorded inflow, outflow and storage volume values. Despite the number of significant figures used in the data...

As I said on the previous page (post #160), inflows are likely calculated by summing upstream gages and adjusting for ungaged areas. As to how flow gages work, the USGS website describes this quite nicely (https://water.usgs.gov/edu/measureflow.html) Streamgaging involves obtaining a...

By doing a simple water balance with the observed inflows and outflows, I’ve had a look at what the reservoir water level would have been without the main spillway temporary shut down and reduced outflows through 7-9 Feb. (I must admit I needed a small fudge factor to get the predictions to...

Hi. I found the site through the threads on the Oroville spillway. The site I came from was full of speculation about lack of rebar etc - a big contrast to the fact based approach on this site. I've found the discussions fascinating - thanks to all the contributors so far. I'm a hydrologist...

Based on my experience doing these sort of calcs, I expect the inflows are calculated by summing the closest upstream gages with some adjustment to account for intermediate ungaged areas. The gages will be upstream of the lake itself so that the flow area is clearly defined. Almost certainly...