Flooding due to the failure of drainage systems is a serious problem for many urban watershed of Iran. This paper shows how flooding in urban drainage systems can be simulated by one- dimensional hydrodynamic modeling incorporating the interaction between (I) the buried pipe systems (II) the streets with open channel flow. The values of the NS, RMSE, and %BIAS statistics were also calculated to assess the validity of the model structure. The NS results for calibration and validation of the case study demonstrate that the calibrated model simulated acceptably the shape of the actual hydrograph. The lower RMSE values also support the accuracy of the calibrated model in simulating the shape of the hydrograph. The absolute value of %BIAS is never more than 20%, which demonstrates that the calibrated model simulated acceptably the total flow volume. The results of this study emphasize the use of one-dimensional hydrodynamic model to Simulation of flooding in urban drainage systems.

Keywords: Babolsar, Simulation, Surface Runoff, Urban Watershed

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