Abstract. The paper presents rainfall conditions for the city of Wroclaw (Poland) in the multi-annual period 1960-2017. A decreasing tendency of annual precipitation totals on the level of -12.5 mm/decade and decreasing trend of the monthly total in November of -2.9 mm/decade has been shown. In remaining months, no statistically significant change trends were observed. The maximum daily rainfall amounts were recorded in summer months: 56.4 mm in June, 74.4 mm in July and 67.5 mm in August. The analysis of variability in the number of precipitation with daily amounts exceeding 10 mm showed statistically significant decreasing trends -a decrease in the number of days in the amount of 0.69 per decade (linear regression). In the case of rainfall exceeding 20 mm and 30 mm no statistically significant trends were noted -the number of days with such heavy precipitation is practically constant and amounts to an average of 3.84 and 1.44 precipitation per year.
In this paper selection of maximal precipitation amounts for Polish Atlas of Rains Intensities (PANDa) has been presented. PANDa supposes to be the source of actual and indisputable information about reliable rainfall intensities for designing of storm water drainage and retention systems in Poland. During the realization of the maximum amounts separation procedure, for chosen 100 meteorological stations with the use of peak over threshold (POT) method, a number of problems has been found, for which proceeding algorithms have been described.
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