A Study of Factors for Design Consideration and Alternative Selection of Flood Protection Barrier Designs Along the Chao Phraya River Using the Analytical Hierarchy Process (AHP)

Abstract

Bangkok is located on the lowland of the Chao Phraya River and is under the influence of the rising and falling sea level. Coupled with the problem of land subsidence, this has led to the worsening of flooding problems. Therefore, flood protection due to the overflowing water level in the Chao Phraya River is implemented by building flood barriers along the riverbank or along canals that are directly influenced by the water level in the Chao Phraya River. This research aims to study, analyze, and determine various factors used in the design of flood barriers and to select the most suitable and effective flood barrier design by using the Analytical Hierarchy Process to prioritize. It was found that the flood barrier design type 4 received the highest total score (0.494) because it is effective in preventing flooding and preventing bank erosion during strong water flows, especially during floods. It is a type of dam that reduces soil erosion at the bank and the base of the dam. It has a strong structure that reduces the water pressure acting on the structure, so there is less chance of collapse.