Abstract
Intensity of action and frequency of high and low pressure barometric fields of large and medium scale have great influence on dynamics of pluviometric regime. On their action depend characteristics of thermic regime, relative humidity, cloudiness and windiness, which directly affect the precipitation. Concerning that the water balance is difference between the inflow and evaporation, it comes that precipitations do not have just special role, but they are also the most important factor of the Una river regime. Disposition and precipitation structure are the river regime's essential assumptions, so at the same annual height of precipitation, we have more water in rivers in the year with more precipitations during the colder period. Then we have less evaporation so the inflow from the basin is bigger.
 The amount and disposition of the precipitation in the Una River basin is analyzed in this paper in order to define the pluviometric regime of this area. Pluviometric regime greatly influences the Una river regime and water balance, what was the reason for this analysis and further hydrological research in the Una River basin.
Highlights
The Una River basin feeds the Sava River with water, and it is a part of the Black Sea Basin
The analysis showed that the annual precipitation amount in the Una basin increases by 47.7 mm per every 100 m
Precipitations decrease going from the west towards the east, and going from the south towards the north
Summary
The Una River basin feeds the Sava River with water, and it is a part of the Black Sea Basin. The Una basin, located in the northwest of Bosnia and Herzegovina, partly crosses into the neighboring Croatia. It borders with the following basins: the Vrbas and the Pliva on the east and southeast, the Cetina, Krka and Zrmanja on the south and southwest, underground waters on the west flow towards Gacko polje, while with basins of the Korana and Glina it borders on the northwest and with direct Sava basin on the north. Various data on the area covered by the Una basin can be found in the professional papers. The data are mainly stated that the basin covers in total 9640 km (Spahić, 1991), on the territory of Bosnia and Herzegovina 9368 km, of which. It is very hard to determine the concrete and accurate watershed, so as the basin surface, until directly hydrogeological researches are done in the whole basin's area (Spahić, Korjenić, Hrelja, 2014)
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