The paper discusses the retention system of storm water in the area of Warsaw Chopin Airport. Describes the adaptation of the SWMM model (Storm Water Management Model) for the Służewiecki Stream subcatchment. Presents results of the calibration and verification of the model, which were carried out on the basis of measured rainfalls and flows, as well of water levels in a retention reservoir and before/after weirs cooperating with reservoirs. The SWMM model was used for calculation of flows with probability of exceedance of 50, 20 and 10%, and then for evaluation of reduction of these flows through reservoirs in the area of airport. The degree of reduction of flows ranged from 76.4 to 77.1%.

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