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  02.08.2019, 07:30h

The water in the Krka National Park is of excellent quality


Independent testing at several sites has shown that the water of the Krka River is not merely healthy

but is also rich in dissolved oxygen, along with a high level of conservation of ecosystems, while any short-term turbidity is a natural consequence of sediment uplift due to temperature differences of the water at certain micro-locations.

The results of the water quality analysis at the Krka National Park, conducted on July 22, 2019 by experts from the Biology Department of the Faculty of Science, University of Zagreb, and the Ruđer Bošković Institute, have shown that the water quality was “excellent” in accordance with all applicable regulations, while it was also confirmed that no river pollution exits in the area in question.

The investigation found that water in the Krka National Park does not contain heavy metals, toxic substances, or fecal bacteria that could potentially endanger the purity of the water and the ecosystems associated with it. At sites with significant biological activity, the highest values of chlorophyll a were measured, and high values of dissolved oxygen were observed, confirming that no significant degradation of organic matter had occurred.

The data measured by the field probe also showed that the water upstream of the Roški slap waterfall is significantly cooler (18° C) than that of Visovac Lake (24° C). Such temperature differences often cause short-term turbidity of water, so-called intermixing. It should be emphasized that this is a completely natural phenomenon caused by the difference in water temperature (hot water “rising” above cold water), due to which sediment is lifted from the bottom. This kind of turbidity between the Roški Slap waterfall and Visovac Lake is short-lived and has no connection to any pollution.

With continuous supervision and monitoring by a sensory buoy, regular water quality tests in the Krka National Park have been carried out since its inception in cooperation with the Institute of Public Health of Šibenik-Knin County and the Institute of Public Health of Split-Dalmatia County. This time, other independent institutions were also included in the analysis in order to completely eliminate any doubts about pollution or any threat to the water treasure that is the Krka National Park. To further facilitate this, additional regular water controls will continue to be carried out in the future by the Biology Department of the Faculty of Science, University of Zagreb, and the Ruđer Bošković Institute.

The last sampling of the surface water of the Krka River was carried out at six stations and no anthropogenic pollution was observed at any of them. The results show that the water is healthy and safe for bathing at the designated places. Moreover, through analysis of the concentration of trace metals (zinc, cadmium, lead, and copper), it was established that at the Krka National Park the concentrations of these metals are several times lower than those prescribed by the regulations of the water quality standard (OG 73/2013, 151/2014, 78/2015, 61/2016).

Since the protection of the Krka River is the main mission of the Park, so far a number of measures have been implemented to protect it from possible contamination. For example, in 2018, in the area of Visovac Lake, we installed a buoy with sensors for monitoring the physical-chemical parameters, which supplies data every 15 minutes, which to the present have never shown deviations from the statutory values.

In addition, we cooperate with eminent scientific institutions in Croatia, with whom we conduct scientific and professional research on the condition of biological and chemical parameters, and the results of these studies are used to conduct monitoring and quality management of the Krka River ecosystem.