Forecasting the Impact of Flood Risk Areas in Lam Takhong River Basin

Abstract

Land development is very important for social and economic of the country. The study of flood risk is also significant for land development. The prediction of flood risk areas and potential impact is important for spatial planning in the future and for solving the problems in the area that has been developed. The purpose of this study is to evaluate the impact of flood risk area using rainfall return period of 5, 10, 25, 50, and 100 years. The Lam Takong river basin is the case study for MIKE FLOOD modelling which the water level and discharge from MIKE 11 and MIKE 21 were analysed. The result revealed that the maximum flood levels for return period 5, 10, 25, 50, and 100 year were 1.37, 1.54, 1.83, 1.92 and 2.66 m., respectively.The maximum discharge of flooding in 5, 10, 25, 50 and 100 year is 174.20, 178.20,180.00, 251.80, and 299.10 m3/s, respectively. The flood affected areas for return period 5, 10, 25, 50, and 100 year were 87.25, 93.19, 135.31, 151.75, และ 206.38 km2, respectively. The most flood affected areas were agricultural and urban areas, respectively. This flood damaged areas were Kham Sakaesaeng, Chaloem Phra Kiat, Mueang Nakhon Ratchasima, Sikhio, and Sung Noen district, and the Mueang Nakhon Ratchasima district is the most damaged area.