(Proceedings of Symposium S7 held during the Seventh IAHS Scientific Assembly at Foz do Iguacu, Brazil, April 2005. IAHS Publication 303, 2006, pp. 371)
This paper presents hydrological predictions and flood safety assessment in a flow regulated basin with multi-purpose dams. A distributed rainfall-runoff prediction system is developed by incorporating a dam reservoir operation model into a physically based rainfall-runoff model for simulating a highly regulated Japanese river basin, the Yodo River basin (7281 km2), in which eight multi-purpose dams are currently operated. The test simulation for typhoon events verified that the system can simulate complex flood control operations such as preliminary release, peak attenuation, and water level maintaining. Following the test simulation, the developed system was applied to assess the flod safety level of the basin. The numerical experiments indicated that the basin is safe for a rainfall event of a 100-year return period due to the newly constructed multi-purpose dams, whereas it was safe only for a rainfall event of a 30-year return period in 1960.
Dam model, Distributed rainfall-runoff model, Flood safety level, Flow regulation, Human impact, Peak attenuation, Yodo river basin
