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Hand auger - general

584 bytes added, 01:15, 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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{| border="1" cellpadding="5" cellspacing="0" align="center"

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! width="50%" style="background:#efefef;" | Advantages

! style="background:#ffdead;" | Disadvantages

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| valign="top" | - Easy to use above the groundwater table <br>

| valign="top" | <br>

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|- 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)

|}

==Construction, operations and maintenance==

Winona

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