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Analysis of freshets caused by heavy rainfall in small urbanized drainage basin of Służewiecki Stream

Barszcz M.

Studia Geotechnica et Mechanica

2009

Vol. 31, nr 4

3-15

The main goal of this study was to evaluate the applicability of the SWMM model (i.e. Storm Water Management Model) to simulation of runoff in the Służewiecki Stream basin (located in the southern part of Warsaw). Both rainfall and discharge data for eighteen selected rainfall-runoff events, measured at the surveyed Rosoła profile, were used in the analysis. The three of the events were applied to the calibration of the SWMM model, whose parameters were estimated from either the available physical information, or the suggested values from the tables in the SWMM manual and the existing literature. In the next phase, the SWMM model was used in order to determine freshets in the Służewiecki Stream basin for the estimated rainfall. The results show that the maximum flow amounted to 15.3 m3źs-1 and 21.6 m3źs-1, for 50% and 10% probability, respectively.