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Hand auger - general

180 bytes added, 02:38, 17 July 2012

→‎Suitable conditions

==Suitable conditions==

[[Image:Auger drilling in temporary casing1.jpg|thumb|right|250px| Auger drilling in temporary casing]]

 

Augers can be used up to a depth of about 15-25 meters, depending on the geology.

{{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - Easy to use above the groundwater tablexxxb| convalign= "top" | - It may be very difficult to remove the temporary casing. If clay layers are penetrated, it is very difficult to use a temporary casing, as it sticks to the clay.<br>

- 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).

}|}[[Image:Auger drilling in temporary casing1.jpg|thumb|right|250px| Auger drilling in temporary casing]]

==Construction, operations and maintenance==

It takes quite some expertise to drill a completely straight borehole.

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Winona

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