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Last edited 24 May 2021
A gully is a type of land formation (such as a ravine, ditch or trench) typically caused by erosion. In Scotland and Northern England, a gully is also a type of large knife that is sometimes used in the kitchen or farmhouse. Despite having nautical associations, a gully knife is not meant to be a weapon, although it may have been used to cut sails.
The term gully is not the same as gulley, which is a fitting with a chamber which is designed to collect rainwater, wastewater and groundwater, conveying it to an underground surface-water sewer. Confusingly however this is often spelt 'gully'. For more information, see Gulley.
One of the earliest appearances of the term gully was in the 1600s. The word has French origins and is associated with the term goule, which can be interpreted to mean mouth.
Gully erosion commonly occurs on hillsides when vegetation is removed by processes such as overgrazing, fires, storms and so on. Human modifications to the landscape can also make hillsides susceptible to gully erosion. Deforestation, site development, hydraulic mining and other types of human activity can make it easier for loose soil to be carried away by flowing water - resulting in gully erosion.
Sometimes sinkholes can be associated with gully erosion, since both are almost always the result of a concentrated flow of water. For example, a sinkhole may trigger the formation of a new gully after a pipe or roadway collapse, or it may extend an existing gully.
 Problems with gullies
Regardless of their origins, gullies will generally grow once they have formed and will continue to grow unless erosion issues are addressed.
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