The article presents basic elements of methodology for landslide risk assessment applied for a case study of the Poroj River catchment area in Macedonia. This region is known as very vulnerable and susceptible to landslide, erosion and flood phenomena, with high level of risks over affected population and infrastructure. Main elements of risk assessment are related to: preparation of shallow landslide susceptibility models, calculation of slope stability and probability of failure of large deep landslide Gjermo located in the middle of catchment area, using the software RocPlane, estimation of eroded volume of landslide with a risk of a damming of the river and determination of possible consequences due to these events. The presented methodology also includes elements of detecting unstable zones applying Differential Interferometry Synthetic Aperture Radar technology. Several consequences with the landslide probability classes are defined, and they are combined as pairs of values in a risk matrix. Results are presented in a form of susceptibility maps for several scenarios (in relation to the values of the geotechnical parameters and the saturation degree of the ground) and the final landslide risk map. The obtained susceptibility maps show that shallow landslides models depend a lot on the saturation degree, but in the analyzed cases, it is evident that the area of Gjermo village landslide is in the zones where the safety factor F<1. From the prepared landslide risk map it is evident that the area of Gjermo village is at the highest risk. The surrounding area of the village, where some houses can be affected together with local infrastructure and the zone around the Hydro Power Plant - HPP3 are at medium risk, and the rest of the catchment area is at low risk because there is no population or infrastructure to be affected by possible sliding. The prepared maps can be used in the design of protection measures necessary to reduce the possible consequences.

The Miljašić jaruga is one of the most important watercourses in Zadar County (Dalmatia, Croatia). The total length of this area is approximately 16 km, with an associated topographic catchment of approximately 191 km2. The downstream portion of the stream is influenced by the sea (estuary). The hydrological regime of the Miljašić jaruga is strongly influenced by climatic features; therefore, for most of the year, there is an outflow of catchment waters, whereas in the summer dry months, the river bed is mostly without outflow. It is also common for extreme precipitation to occur after a long dry period, resulting in sudden increase in water levels and flash floods. One such extreme event occurred on September 11, 2017, when a severe storm followed by heavy rain affected Zadar and its hinterlands. On that occasion, approximately 240 mm/m2 fell in Zadar over a period of 6 h, with an intensity of up to 70 mm/m2/h. Such extreme rainfall activated violent and torrential runoff, flooding, and damage in the entire catchment area of the Miljašić jaruga, particularly in the most downstream part of the basin, in the area of the estuary and the town of Nin. Numerous infrastructural and communal facilities have been damaged, including the Nin Salt Works. This paper presents the hydrological analysis of a flash flood event in the Miljašić jaruga estuary. A hydrological series of 26 and 27 years were compared, whereas the longer series include historical flood, using three distributions: normal, log-normal and Gamma. The relevant hydrological parameters (water levels and flows) used for dimensioning the flood defense system show great variability depending on the available data (time series) and calculation methodology. For example, variation of flow rate reached 41 m3/s for 100-year high waters, that is, from 60 m3/s (n = 26, normal distribution) to 101 m3/s (n = 27, log-normal distribution). In engineering practice, the unreliability of the estimation of statistical quantities should be considered to improve the effectiveness of flood defense systems. The rehabilitation and reconstruction work conducted after a flood on hydrotechnical structures (embankments) in the estuary area is described. In addition, there is a need for adequate water management across the entire basin, such as the construction of retention and barriers, which would increase the level of flood protection in the most downstream parts, i.e., the estuary.

Concrete pavement structures in Serbia and throughout the Western Balkans are still designed according to standards published more than 30 years ago, relying on material models derived from PBAB 87. Industrial floor slabs, although structurally almost identical to concrete pavements, are often designed according to foreign guidelines, using material properties determined in accordance with EN 206 and EC 2. Modern national regulation, including the Regulation on Technical Requirements for Concrete, SRPS EN 206:2021, SRPS U.M1.206:2023, and EC 2, requires a unified approach to defining concrete properties for all concrete structures. As a result, a significant discrepancy arises: structures exhibiting the same mechanical behavior are designed using different material models, with different values of tensile and flexural strength, modulus of elasticity, and compressive strength. This paper provides an overview of current design practice for concrete pavements and industrial floor slabs, with special emphasis on manipulation traffic slabs used on industrial platforms. Concrete properties according to PBAB 87/SRPS U.E3.020 are compared with those defined in EN 206/EC 2, accompanied by a discussion on how this choice affects structural design. Since the second generation of EC 2 does not cover slabs on ground, the need to harmonize national road engineering standards with EN 206 is emphasized, as well as the need for the third generation of Eurocodes to introduce specific provisions for concrete pavements and industrial slabs.