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Water Portal / Rainwater Harvesting / Groundwater recharge / Bunds

1 byte added, 19:15, 30 March 2012

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[[Image:Bund.JPG|thumb|right|400px| Inside of a bund wall. Photo courtesy of [http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&ved=0CGsQFjAI&url=http%3A%2F%2Fwww.arcworld.org%2Fdownloads%2Fsmart%2520water%2520harvesting.pdf&ei=NXNzT7CYEIiTiQKdxviYCw&usg=AFQjCNECS9O4gaRRQadp5dd4B5RDPxTwQA&sig2=QwWuUbra7my8Dpq5c_0baw ''Smart Water Harvesting Solutions]]]

[[Image:TrapezoidalBund.JPG|thumb|right|400px| Shape of a trapezoidal bund system.]]

Bunds (also called teras) are small barriers to runoff coming from external catchments (and possibly to a field where crops are to be grown). Bunds slow down water sheet flow on the ground surface and encourage infiltration (groundwater recharge) and soil moisture. There are different types if bunds. A rectangle type, where land is "bunded" on three sides, with the fourth side left open to capture runoff from an elevated area and a contour type, where bunds are created in rows along the contour of a hillside. The bunds consist of small stone or earthen walls. A small channel on the inside of the bunds is made to let the water run along. Excess water drains along the tips of the outer arms (rectangle type). These spillways may improve the efficiency and reduce maintenance costs of the teras. The base bund can be 50-300 meters long, while the arms are usually 20-100 meters long.

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