Waterlogging disasters in the lakeside areas of shallow lakes that located in plain regions are sensitive to lake-level fluctuations. However, there are very few studies on the influences of lake-level fluctuations on waterlogged lakeside areas from a large lake basin perspective. This paper proposes an integrated hydrodynamic model employing the MIKE software to contribute to the existing literature by filling the gap constituted by the lack of an estimation of the impacts of lake-level fluctuations on waterlogging disasters by relevant models. First, a coupled one-dimensional and two-dimensional hydrodynamic model is established to simulate the waterlogging routing in the lakeside area around Nansi Lake (NL) in addition to the flood routing in NL and its tributaries. Second, the model is calibrated and verified by two measured flood events in July 2007 and July 2008; the results indicate that the model can correctly simulate the drainage process of pumping stations in the lakeside area, as well as the interactions between the waterlogging drainage and lake-level fluctuations. Third, the process of waterlogging in the lakeside area of NL is simulated under different rainfall events and initial lake-level conditions. Fourth, based on the results of the model, this paper illustrates the influences of lake-level fluctuations on the waterlogged area around the lake, as well as the different responses of waterlogging in different areas to lake-level fluctuations in NL and the main cause for these differences. Finally, based on the results of the model, this paper presents some implications for waterlogging simulations and drainage system design.According to statistics, weather events account for 62% of all of the events recorded as natural disasters, and floods and storm events account for 60% of weather events [5]. The lakeside area around shallow lakes, especially for lakes in the plain area, will experience more serious waterlogging disasters with greater severity in the future due to the combined effects of climate change, rapid urbanization, and the insufficient capacity of the rainstorm drainage system. Accurately simulating the process of waterlogging in shallow lake basins to reveal the response relationship between WLFs and waterlogged areas has a great significance for the scientific arrangement of drainage engineering and correct decision making regarding flood control. Due to the lake level being one of the decisive factors in the functioning of lakes, especially shallow lakes, the effects of lake-level fluctuations on the water quality and biota in lakes have been documented by many papers [6][7][8][9][10]. Meanwhile, in addition to influencing the ecosystem of lakes, lake-level fluctuations also have obvious effects on the interactions between lakes and other bodies linked to them. Rasid and Hufferd [11] noted that the lake level has a significant effect on the flood hazards in the lakeside area of Lake Superior. Clausen and Johnson [12] reported the response of sediment and nutrient retention within we...