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The variability of the atmospheric precipitation in the region of Wielka Laka dam reservoir

Kozak Janusz, Jachniak Ewa

Ecological Chemistry and Engineering. A

2020

Vol. 27, nr 1-2

1--17

The aim of this research was the analysis of the precipitation variability in the last decade in the region of Wielka Laka reservoir. The daily sums of the precipitation (from 2005 to 2018) were the research material. They were obtained from the Aqua S.A. in Bielsko-Biala. The measurements were carried out according to the standard method using the Hellman pluviometer. In research the precipitation indicators were used, which are commonly applied. They were used to description of the precipitation characteristics. The frequency of days with precipitation at the certain height was determined according to the Olechnowicz-Bobrowska classification. The classification of individual years and months in respect of the excess or lack precipitation was conducted based on the Kaczorowska method. In the analysed multi-year period (2005–2018) the dry years prevailed, however the significant regularity wasn’t noticed. In the analysed multi-year period the highest rainfall was recorded in 2010 year, when in May the total precipitation was summarised at the 171 mm level. The recorded precipitation accompanied the inflow of air masses in the directions from the east (E) to the northwest (NW).