From today until February 2026, a helicopter will fly over parts of Drenthe, Groningen, and Friesland to map the underground. This helps determine where clay layers are located that protect groundwater, and where fresh and salt groundwater is found.

What is happening?

Under the helicopter hangs a round measuring loop of about 20 meters wide. This instrument emits weak electromagnetic signals, similar to those from a mobile phone. These signals measure the underground, providing information about soil layers and groundwater. The measurements are safe for humans, animals, and nature. Flights do not occur during the breeding season, and strict rules apply to nature reserves.

What will you notice?

• The helicopter flies during the day at about 80 meters altitude at a speed of 60 to 80 kilometers per hour.
• This may cause short-term noise disturbance. Animals may be startled by this.
• The pilot keeps an eye on the surroundings and considers animals.
• Keep a close watch on animals and take necessary measures, such as temporarily keeping them indoors.

Planning

The schedule depends on the weather and may change daily. The current flight schedule can be found at www.provincie.drenthe.nl (refers to another website).

Watch the online webinar (refers to another website) about the FRESHEM-NL project.