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[[Image:gabionStructure.jpg|thumb|right|300px350px|Gabion structure in a stream bed. Photo: SAI.]]
A gabion is semi permeable barrier, made of boulders in a mesh of steel wires and anchored to the stream bank, to slow but not stop, the flow of storm water in a small watercourse so to favour water infiltration to groundwater and help prevent soil erosion.
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