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Rill
Shallow channel cut by water / From Wikipedia, the free encyclopedia
For grooves on the moon, see Rille.
In hillslope geomorphology, a rill is a shallow channel (no more than a few inches/decimeters deep) cut into soil by the erosive action of flowing surface water. Similar but smaller incised channels are known as microrills; larger incised channels are known as gullies.
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Look up rill in Wiktionary, the free dictionary.
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Artificial rills are channels constructed to carry a water supply from a distant water source. In landscape or garden design, constructed rills are an aesthetic water feature.