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Gully erosion is a highly visible form of soil erosion that affects soil productivity, restricts land use and can threaten roads, fences and buildings. Gullies are relatively steep-sided watercourses which experience ephemeral flows during heavy or extended rainfall.
Soil eroded from the gullied area can cause siltation of fencelines, waterways, road culverts, dams and reservoirs. Suspended sediments, which may have attached nutrients and pesticides, can adversely affect water quality. These fine, colloidal clay particles remain in suspension and may clog groundwater aquifers, pollute water courses and affect aquatic life.