Aquifer: Soil layer in which groundwater is present
Bentonite: Drilling liquid, normally a clay mixture, that is being used for a HDD drilling. It prevents the drilling hole from collapsing and carries the soil that is drilled out.
Expand: to enlarge
HDD Drilling: a Horiztonal directional drilling
Heterogenous: consisting of non uniform pieces
Homogeneous: consisting of pieces of uniform size
Perforation: The gaps in the filterpipe. Also called the filter crevice.
Regenerate: to maintain
Rig: a drilling machine
Sand delivery: Entry of sand in a filter pipe
Screen: soil directly around a filter pipe
Spikes: subsidence in the level of underground water caused by vertical wells
TCO: Total Cost of Ownership
To develop: the final preparation of the soil around the filter pipe
Total cost of ownership: The total cost of a product during it’s entire lifecyclus. This includes e.g. development, construction, maintenance and destruction