In contrast to too much water, which will increase surface tension and push the grains apart, a small amount of water causes the surface tension to decrease, allowing the grains to bond together.
1. Slope failure typically occurs more frequently on steep slopes than on gentler slopes. For loose sediment, there is typically a slope angle that distinguishes between a tendency for slope failure and slope stability. The angle of repose is what is meant by this. This angle is about 34 degrees for loose sand. For other materials, this angle may change.
2. The instability of a slope is increased by the addition of water. Rock pieces are easier to slide down slopes because it lubricates them. This is why mass wasting is more frequent during rainy seasons. It turns out that increased surface tension in the soil caused by a small amount of water can help slope stability. Naturally, surface tension has no effect when there is too much water present.
3. Because its roots anchor sediments, vegetation improves slope stability. Additional water that could cause a slope breakdown can be absorbed by plants. But vegetation on a slope cannot stop an excessive amount of water in the soil.
4. As was already mentioned in previous lectures, earthquakes typically enhance the chance of mass wasting in landslide-prone areas.
5. Mass waste is most likely to get worse if there is a lot of loose material on the slope.
6. When a slope falls, landslides tend to accelerate because of high relief (the vertical distance between high and low altitudes).
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