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Subsurface harvesting systems

No change in size, 03:05, 3 October 2013
Construction, operations and maintenance
'''Specific advice''':
[[Image:SubsurfaceDam.jpg|thumb|right|300px200px|Mechanics of a subsurface dam. Drawing: WHO.]]
The dam can be constructed of concrete, masonry, blockwork, stone-filled gabions with waterproof membranes such as plastic sheet or clay layer, or stabilised soil.
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