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Water Portal / Rainwater Harvesting / Groundwater recharge / Bunds

5 bytes removed, 17:35, 30 March 2012

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Bund design has to be adjusted according to local conditions. They can vary in design and include non-enclosed systems (e.g. trapezoidal bunds where water escapes around the edges), and enclosed systems (e.g. bunded fields where water enters via a channel and escapes from a spillway in the bund once the field is flooded). In certain site-specific examples, they are used to create small artificial glaciers which helps release melt water slowly, so as to adjust to short sowing seasons.

Teras show higher crop returns in dryer years and allow farmers to diversify income sources in normal years. In West Africa the technology is widely used in valley bottoms.

==Suitable conditions==

- Reduces soil erosion <br>

- Smaller scale encourages ownership, which means a higher rate of success <br>

- Higher crop returns in dryer years and allow farmers to diversify income sources in normal years <br>

| con= - High cost and effort involved in some earthworks, so poor or vulnerable families (e.g. single headed households) may struggle. A possible remedy: reduce donor dependency... use grain from harvests to pay off a loan that was used for the earthworks. Artificial glaciers in India were costing around $6,000 but it depends on the site. <br>

- Breached bunds will require repair work <br>

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