[meyer]

Main danger is the earth/stone fill under the concrete section of the emergency spillway being eroded away, causing failure of part of the concrete section above, most likely via a V notch breach.

Thanks - I'm just thinking that as the soil under the concrete erodes, then there may be a big hole soon between the lake and the land below. That hole will erode to a huge passage if it happens.

[SE Mom]

Exactly.

[tomkat]

After hearing some further details I'd not heard previously, the hole you mentioned does seem to be the main concern at the moment.

KCRA talking heads are starting to make relief noises re the water level at the emerg spillway currently dropping slightly, as the main spillway has been opened to 130,000cfs.

However, any significant undercutting/holes that might already have developed on the lee side would throw the engineering parameters into some question/doubt for the structure as a whole.

With even more storms forecast for that area early in the week, the situation seems by no means resolved, even should tonight pass without a major breach.

Anyway, apologies for the naysaying, FRiend.