Akvopedia-spade, administrator
3,247
edits
Changes
no edit summary
[[Image:Auger drilling in action.jpg|thumb|right|250px| Auger drilling in action]]
__NOTOC__
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).
}}
[[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.