A Comparative Study of Peak Flood Analysis at Various Return Periods of the Lam Takong Reservoir

Abstract

The Lam Takong Dam in Nakhon Ratchasima province was completed in 1969 and has been in operation for over 50 years. Therefore, it is necessary to review the flood conditions of the catchment area over the dam to obtain the current analysis results that can be used for management and preparation for floods caused by various potential disasters. The analysis of peak floods at various return periods in the study area was calculated using 3 methods for comparison: Regional Flood Frequency Analysis, flood hydrograph calculation from storm rainfall using the Unit Hydrograph technique, and Probable Maximum Flood (PMF) calculation. It was found that the analysis results of peak flood at various return periods using the flood hydrograph calculation method with the Unit Hydrograph technique were higher than those analyzed by the Regional Flood Frequency Analysis method. Therefore, when studying flood conditions in the study area caused by large water releases from the reservoir or flood conditions due to various potential disasters that may occur at the dam, the results of peak flood at various return periods using the Unit Hydrograph method or the Probable Maximum Flood calculation method for the watershed area of the Lam Takong Dam should be used as input data for mathematical models to simulate the flood conditions. This will lead to the most appropriate and effective preparation for disaster mitigation due to floods.