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Subsurface harvesting systems

164 bytes added, 20:30, 7 April 2012
→‎Construction, operations and maintenance
==Construction, operations and maintenance==
[[Image:SubsurfaceDam.jpg|thumb|right|300px|Mechanics of a subsurface dam.]]
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. 
* Build the crest of the underground dam at least 1 metre beneath the ground surface, so the land does not become water-logged.
* Subsurface dams should have wing walls, just like a [[sand dam]] does, where you can pile up rocks so that erosion does not occur.
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