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Water Portal / Rainwater Harvesting / Groundwater recharge / Bunds

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→‎Construction, operations and maintenance

==Construction, operations and maintenance==

[[Image:contourStonebund.JPG|thumb|right|300px| Contour stone bunding on a hillside.]]

[[Image:stonebund.JPG|thumb|right|300px| Details of a stone bund.]]

Local people should have a good degree of control in programme implementation, and the focus should be on appropriate techniques that can be operated and maintained using local resources. However, social/institutional constraints are not the only (or even primary) concern when building bunds – technical considerations are often overlooked. A few lessons learned are listed here which might apply generally:

* The erratic nature of rainfall intensity and lack of good rainfall data meant that designing bunds based on certain assumed runoff coefficients was difficult - sometimes runoff was vastly underestimated, and this was the reason for 90% failure rate of earthworks during the first 2 years of a large bund building programme where high runoff flows damaged bunds.

Winona

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