The wetland around the Biebrza in Poland

As this movie trailer shows, the Biebrza is a natural, meandering lowland river and is one of few such rivers in Europe. In 1993 the Biebrza National Park was created in order to preserve the Biebrza marshes and peatlands, as similar are rarely to be found in today’s Europe. iFLUX has the unique opportunity to measure the groundwater dynamics at a wetland zone inside the Biebrza National Park with our newly developed digital sensors . The measured data will serve as input for modelling the wetlands groundwater flows.

The vegetation in wetland habitats depend on water quality, quantity, patterns of river discharge and groundwater-surface water interaction on a local or regional scale.

The waterflows in this environment are first simulated in a model based on the hydraulic head, topography, water table measurements and the flow rate of the river. The soil in this surrounding contains a glacial peat deposit with a more permeable sand layer underneath.

The model will now be calibrated by using different measuring methods.

The different measuring methods used to calibrate the model in this project are:

  • Water level meters
  • The iFLUX real-time digital sensors
  • Other researched measuring method


What are we measuring?

The measurement area is located near Rogozyn Stary, in the upper Biebrza (see map below).

The interaction between groundwater and surface water is measured using the iFLUX digital sensors.

We are measuring inside the river, with 2 vertical sensors, and we are using 2 horizontal sensors to measure the interaction in the surrounding valley.

The horizontal sensors are each installed in a different layer of the subsoil, one in the peat layer and one in the sand layer.

This setup will stay from mid-October till the end of February while the sensors sent their data through a gateway for remote data access. The measured flux data will also be linked to the measured hydrologic variation.


Lessons learned:

This study enables us to further optimize the iFLUX digital sensors and adds knowledge that will improve further applications.

The data will be compared to other measuring techniques to calibrate the groundwater model.

The results of the study are still being processed. Nevertheless, we have already been able to take steps forward in terms of sensor design, but also in terms of installation into the water and in the field.


Partners in this study are: University of Antwerp, ecosystem management group, Warsaw University of Technology, Warsaw University of Life Sciences, iFLUX NV


If you have an interesting pilot project where digital flux measurements can be used, be sure to let us know via

Image Real-time groundwater measurements in Poland make iFLUX move forward Image 1
Image Real-time groundwater measurements in Poland make iFLUX move forward Image 2