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Sheet erosion is the uniform removal of soil in thin layers by the forces of raindrops and overland flow. It can be a very effective erosive process because it can cover large areas of sloping land and go unnoticed for quite some time. Sheet erosion can be recognized by either soil deposition at the bottom of a slope, or by the presence of light-colored subsoil appearing on the surface. If left unattended, sheet erosion will gradually remove the nutrients and organic matter which are important to agriculture and eventually lead to unproductive soil.
If the area is flat, puddles begin to form. If the area is on a slope, however, the unabsorbed water begins flowing downhill it in a thin sheet, carrying away the soil particles that have been loosened by the raindrop bombardment. This process is called sheet erosion. Rain splash and sheet erosion generally account for more than 70 percent of down-slope erosion. A single rainstorm can wash away one millimeter (0.4 inches) of dirt. This may not sound like much, but it translates into more than five tons per acre. It takes about 20 years to create that much soil by natural processes.