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[[Image:Auger drilling in action.jpg|thumb|right|250px| Auger drilling in action]]

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The hand auger is suitable for unconsolidated formations: sand, silt and soft clay. Stiff clays, hard materials and gravels are difficult or impossible to drill through and to remove (unless augering is combined with [[percussion - general|percussion]]).

- 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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==Construction, operations and maintenance==

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