Tornado Alley (PROG)

[DesertDrifter]

i was operating from memory and i garbled Horton overland flow and saturation overland flow. Horton overland flow is where the precip is falling faster than the potential infiltration rate, sort of like water running off a driveway because it cannot soak in fast enough. Saturation overland flow is when the ground is so saturated it cannot take any more and the water immediately runs off, and is mostly dependent upon infiltration rate and previous rain.

In the case of the Oso slide, the soil is so deep that there wasn't much runoff, the soil itself at the base of the slope became turbulent flow and was squished out by the falling load at the top (which is mostly intact)

one point i wanted to make was that the slide wasn't a direct failure of a clearcut slope... notice that the debris isn't stumps, but intact trees, mostly alder.