FUNDAMENTAL STUDY ON WATER STORAGE FUNCTION OF ABANDONED PADDY FIELD ON SMALL RIVER FLOODPLAIN

Abstract

 A two-dimensional flood flow analysis was conducted to investigate the characteristic of inundation and the water storage function of abandoned paddy fields along Tai River, small river, in Toyooka City, Hyogo Prefecture, Japan. The simulation results showed that 25% of total discharge was stored in abandoned paddy fields during the event of 1/30-year rainfall. Furthermore, 22% of peak discharge was cut and stored by abandoned paddy fields. These water storage functions were provided weir and water bar to reduce velocity of flood in the abandoned paddy field, set by local people.