Due to the large amount of river sediment, and the long-term ban on the necessary regulation of watercourses, the Drava River meanders uncontrollably, and there is a continuous collapse of riverbanks with the creation of larger shoals and reefs in the riverbed. The consequence of these processes is a significant reduction in the flow profile of the watercourse on certain sections that seriously increase the risk of floods when a larger water wave arrives and also threaten with the formation of ice barriers in the winter months which would prevent the navigation on the Drava River.
One of the critical sections exposed to the formation of ice barriers with an increased risk of floods due to the very low flow capacity of the Drava riverbed caused by these processes, and by the construction of the road bridges belonging to the 5C corridor and to the Osijek western bypass, is the section from the rkm 30 + 000 to rkm 32 + 500.
The section of the Drava River from rkm 30 + 000 to rkm 32 + 500 is a stretch of a very wide riverbed with extremely small depths within the regulation lines on which a large reef in the watercourse was formed.
Considering the aforementioned problems on this section, on the basis of the Water Act and in accordance with all the prescribed nature protection measures, we have begun the implementation of water maintenance works by removing the excess sediment from the watercourse bed at the subject location Bokroš.
We are carrying out the aforementioned works with our self-propelled floating refueler PAPUK, the multi-purpose floating excavator RAK, and with all the other necessary construction machinery.
Based on the Study of environmental protection, the images of the riverbed and the after the development of the construction model, it was determined that 460,000 m3 of excess sediment have to be removed.
Given that a large number of state and EU projects for the construction of public buildings of interest to the Republic of Croatia are located in Slavonia, the contractors will use the removed material in the course of their construction.