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Water Portal / Rainwater Harvesting / Groundwater recharge / Gabions

951 bytes added, 17:57, 1 May 2012
Created page with "Gabion structure in a stream bed. Photo: SAI. A gabion is semi permeable barrier, made of boulders in a mesh of steel wires and an..."
[[Image:gabionStructure.jpg|thumb|right|300px|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.

The height of such structures is around 0.5 m and 1m wide, and is normally used in the streams with width of less than 10 m.

==Suitable conditions==
* Gabions should be located within a straight reach of the watercourse, not on a curve nor immediately after a curve.
* A poorly constructed gabion can do more harm than good by diverting water towards the bank. Consult a qualified professional.

==Construction, operations and maintenance==


====Maintenance====
Inspect gabions following major runoff events. Adjust apron size, gabion width, and gabion height as needed based on its performance.
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