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Hand auger - general

2 bytes removed, 00:32, 1 June 2012
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- The borehole does not stay open if a collapsing sand layer is encountered below a clay layer (through which the temporary casing could not penetrate)
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[[File: Drilling Method Selection.jpg|thumb|center|500px|Drilling-method selection. Chart: WEDC Loughborough University Leicestershire.]]
 
==Construction, operations and maintenance==
All tools can be made in local workshops (with local materials) and are commercially produced in western countries (but more expensive).
 
[[File: Drilling Method Selection.jpg|thumb|center|500px|Drilling-method selection. Chart: WEDC Loughborough University Leicestershire.]]
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