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Flooding is a problem of lowland areas which usually causes damage to the facilities and property. Its estimation and control becomes important especially in the lowland area. Heavy rainfall on July 2, 1990, produced a flood in the Saga plain, a lowland in north of Ariake Sea in Kyushu Island, Japan. This area is endangered by land subsidence due to withdrawal of groundwater. A simulation based on the network model consists of six tanks developed to reproduce the actual flooding of the area. From the achieved results it can be concluded that the comprehensive ability of drainage can be obtained by such simulation and the real drainage capacity has been decreased by the land subsidence phenomena. Finally, it can be concluded that the proposed model can be extended for controlling flood distribution into the artificial recharge System of groundwater in arid regions.