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Riverbed infiltration galleries

452 bytes added, 17:21, 7 April 2012
→‎Construction, operations and maintenance
==Construction, operations and maintenance==
[[Image:InfiltrationGalleryDiagram.jpg|thumb|right|400px300px|Infiltration gallery Image courtesy of WEDC. © Ken Chatterton. In: Hussey, S.W. (2007) Water from sand rivers: guidelines for abstraction. WEDC, Loughborough University, UK.]][[Image:InfiltrationGalleryBuild.jpg|thumb|right|400px300px|Building an infiltration gallery. Infiltration Area: 1080 ft2 (100.3 m2). Cost - $9.33/foot2. Overseas supplier (AUS).]]
====How deep is the water table?====
Some rural people and most well-diggers know that water can only be found at certain places in riverbeds. They can also give a rough estimate on how deep they have to dig before reaching the water-table.Their knowledge is based on the fact that certain species of trees and vegetation must have roots reaching down and into the water-table in order to survive droughts. This traditional information (based on Kenyan plants) is compiled in the table below as an example. Make sure to find the unique regional plants specific to your site area.
 
Since the trees below must have their tap root in the water table, the depth of a water-table can be found by knowing the depth of the tree’s tap root. A rule of thumb states that the tap root of a tree has a depth equal to about 3⁄4 of the height of the tree. The height of a tree can be found by measuring the length of the shadow the tree is casting on the ground and comparing it with the length of the shadow of a stick 100 centimeters long.
[[File:WaterTableDepth.jpg]]
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