Research on the Effect of Natural Cisterns on Flooding in Villages in The Plain Area-Take A Village in Shandong Province as An Example

. In recent years, flood have become more frequent and serious. The important measure to prevent villages flood disaster is to construct the drainage system. This paper takes the typical villages in the plain area as the research object, based on SWMM to establish the rain-floods model. In consideration of backwater of river, pipeline and channel siltation, we made the simulation of rain-flood with different frequency of rainstorms. We evaluate the rural drainage system scientifically and analyze the role of rural natural cisterns in it. The result shows that the rain-flood model in this study can simulate the actual disaster process well, and the results are reliable. Natural cisterns can reduce the pipeline overload and water accumulation, and improve the capacity of flood prevention of the village.