Analisis Debit Banjir Untuk Perencanaan Bendung Malunda Kabupaten Majene

Abstract

This study aims to analyze the flood discharge of the Malunda Weir design. This research can be used as a reference for similar research. Due to the earthquake in Palu, the dam cracked in several parts, then collapsed due to flooding. Planning for flood control, river security, and other water structures can be carried out properly if the planned flood discharge in the river is known. Regional average rainfall is calculated by the Algebraic Average method. Then analyzed by calculating the design rainfall using the Gumbel method, Log Pearson Type III and Log Normal. Then determine the flood discharge using the HSS Nakayasu and HSS Gama I methods with return periods of 25, 50, and 100 years. Based on the calculation results of the Nakayasu HSS method, the flood discharge for a period of 25 years = 791.570 m3/second; 50 years = 903.575 m3/second ; and 100 years = 1014, 533 m3/sec. In the HSS Gama I method, the flood discharge for a period of 25 years = 860,794 m3/second; 50 years = 1005.687 m3/second ; and 100 years = 1149, 507 m3/sec. From the calculation of the 2 HSS methods, it can be concluded that the closest Synthetic Unit Hydrograph is the Synthetic Unit Hydrograph. From the calculation of the 2 HSS methods, it can be concluded that the closest Synthetic Unit Hydrograph is the Synthetic Unit Hydrograph.