Research Polygon • Water pump Velika Gorica

Field laboratory

Lab Activities

VG VODOOPSKRBA d.o.o. water supply from Velika Gorica and the FACULTY OF MINING - GEOLOGY - PETROLEUM ENGINEERING, UNIVERSITY OF ZAGREB, on 15.11.2016. signed an agreement for scientific and professional cooperation. As part of this cooperation, the project under name "Quantification of effective precipitation infiltration and identification of hydraulic parameters of Zagreb aquifer unsaturated zone by establishing a research polygon, Pilot area - Velika Gorica wellfield" was launched, which includes research of aquifers (unsaturated and saturated zones).

Teaching-research polygon is designed as a pedological pit which is 3,25 m deep and has external floor dimensions of 3.4 × 3.4 m (internal dimensions 3 × 3 × 3 m). The pedological pit has glass walls which enable visual inspection of the unsaturated zone profile and the installation of the probes for unsaturated zone processes monitoring. Teaching-research polygon also has a weather station installed on the surface and a pluviometer without evaporation beneath the station.

The main purpose of this scientific research is to quantify the value of effective infiltration which seeps all the way down to the water table and to determine the main geochemical processes that are occurring in the unsaturated zone. The research will enable detail quantification of amount and intensity rate of precipitation, and also the precipitation infiltration in the unsaturated zone and aquifer. The research will improve the knowledge about aquifer boundaries and parameters, which will further upgrade the regional groundwater models as well as the unsaturated flow models through the Zagreb aquifer.

Head of the Lab: This email address is being protected from spambots. You need JavaScript enabled to view it., Prof., PhD.

Analytical procedure and test method

TDR probes TRIME PICO 64 for measuring electrical conductivity, temperature and moisture content,  Suction Cups for water sampling for isotope and chemical analyzes, as well as tensiometers for matric suction measurement were installed in the eastern wall of the peological pit. All data is stored on the data storage devices data logger IMKO globeLog and dataTaker DT80 which are located in the pit.

The Davis Vantage Pro2 meteorological station is installed on the surface next to the pedological pit at a height of 2,5 meters, and measures the amount of precipitation, solar and UV radiation, humidity, wind strength and direction. Beneath meteorologic station is pluviometer for precipitation sampling. The installation of devices at the research site was completed in early 2019, and from February 1, 2019. the measurements are continuously collecting data of electrical conductivity, temperature, moisture content and matric suction, and the amount of precipitation, solar radiation, humidity, wind strength and direction and air temperature. The collection of water samples for chemical and isotope analyzes is carried out on a monthly basis. All data that are continuously collected and stored, are processed in accordance with the research program.


Small and medium sized equipment
Naziv inventara Primjena Slika

TDR probes Trime Pico 64

Measuring electrical conductivity, temperature and moisture content in the unsaturated zone


Suction Cups

Water sampling for chemical and isotope analyzes


Data storage devices IMKO globeLog i dataTaker DT80

Data collection and storage


Meteorological station Davis Vantage Pro2

Measuring precipitation, solar and UV radiation, humidity, wind strength and direction and air temperature


Pluviometer without evaporation

Precipitation sampling for isotope analyzes


Tensiometer Tensio 152

Matric suction measurement 6 


Teaching in the Lab (students' practical work)


Teaching methods

Water Protection

Practical excercises, thesis research


Practical excercises, thesis research

Hydrogeological Investigations Design

Practical excercises, thesis research


Teaching in Lab (Students’ research)


Tema rada

Laura Bačani

Development of flow model in unsaturated zone

Iva Vukadin

Hydrogeochemical characteristics at the Velika Gorica wellfield

Ana Rečić

Calculation of reference and actual evapotranspiration in the area of the Velika Gorica wellfield

Adriana Kukolja

Hydraulic conductivity estimation with constant level permeameter method owith in the area of Velika Gorica


Projects in Lab


Continuous monitoring of precipitation amount and infiltration through unsaturated zone as well the properties of soil and unsaturated zone (temperature, electric conductivity, moisture content and matric suction).

Continuous sampling of precipitation, leachate and groundwater in order to monitor their ionic and isotopic composition. The teaching-research polygon is also suitable for further research that should follow, which will, among other things, be focused on the pollution migration from the surface of the terrain through the unsaturated zone to the groundwater.



The education is carried out within Hydrogeology graduate study (Hydrogeology and Engineering Geology program and Environmental Geology program) and Mining graduate study (Geotechnics program)

The study curriculum enables students gaining new theoretical and practical knowledge about the flow of water through the soil and unsaturated zone, and monitoring methods (electric conductivity, water content, temperature and matric suction monitoring) as well as leachate collection in unsaturated zone.





Figure 1 Teaching-research polygon (the pit and meteorologic station).


Figure 2 Glass walls for visual inspection of the unsaturated zone profile and the installation of the probes.