Based on the rainfall event (precipitation depth equal to h = 55.6 mm), which occurred on the area of Ursynów in Warsaw and caused water logging of several building structures and roads, rainfall parameters were determined. This data were used to calculate the parameters of the storm water drainage system. The research was performed for sub-catchment located in the urban area at Raabe Street in Ursynów district. The obtained results were compared with the values for which existing drainage system was designed in the year 1982. Performed calculations show that according to designing standards for rainfall intensity (q) equal to 131 dcm³/s ha (equivalent rainfall depth h = 11.8 mm) diameter of the existing drain d = 0.2 m should be equal to 0.275 m, whereas for rainfall intensity q = 185.4 dcm³/s ha (h = 55.6 mm) appropriate diameter of the drain will be equal to 0.35 m.

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