Example of soil disturbance or erosion . Soil movement by rainfall is usually greatest and most noticeable during short-duration , high-intensity thunderstorms . Although the erosion caused by long-lasting and less-intense storms is not as spectacular or noticeable as that produced during thunderstorms , the amount of soil loss can be significant , especially when compounded over time . Runoff can occur whenever there is excess water on a slope that cannot be absorbed into the soil or trapped on the surface .
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