When the water is in the way

Horizontal dewatering is an implementation method whereby groundwater is pumped up via a drain. This can be accomplished through gravity or vacuum. This is the preferred technique for drainage of trenches, used for the construction of underground infrastructure and large surface areas, such as building pits. A drain can be dug to a maximum depth of 8 meters using a laser controlled trenching machine. If the soil has a poor permeability the trench can be filled with drainage sand or gravel. This enhances the flow of water into the drain.

When the vacuum technique is applied the perforated and blind tube is connected at ground level to the vacuum pump. The pressure drop promotes the flow of water.

For large surface areas and during long periods of time, the application of the gravitational system is the most interesting option. First a pump pit is installed and subsequently the drains are connected. From this pit the water is discharged by a submersible pump.

Advantages:

  • A construction site location and less obstacles.
  • Up to 30% reduction of groundwater withdrawal which results in reduction or elimination of groundwater taxation.
  • Reduced fuel and/or electricity consumption.