<p><p><figure id='attachment_1658' style='max-width:344px' class='caption aligncenter'><img class="wp-image-1658 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photography showing a continuous flight auger pile rig." width="344" height="533" /><figcaption class='caption-text'> CFA pile rig. From Brown et al. (2007)</figcaption></figure></p><p>Continuous flight auger piles are a form of deep-foundation system. A hollow-stem auger is used to form a borehole and sand-cement grout or concrete is pumped into the hole as the auger is removed to create a cast-in-place column. With this technique, construction is rapid, and disturbance to surroundings is minimal, and the costs are relatively low. This technique is applicable to new embankments and embankment widening over unstable soils.</p><p>