Prefabricated Vertical Drains
Prefabricated vertical drain (PVD) or wick drain is a soil improvement method commonly used to speed up the consolidation of soft foundation. The installation of PVD is normally followed by the placing of a temporary surcharge or preloading embankment which causes water to be squeezed out through the PVD.
This video shows how drains are drilled into the soil with the use of the machine. This is done repeatedly until the desired number of drains are inserted into the ground.