Analysis of drainage network capacity in Rawa Jaya Area, Ilir Timur I, Palembang

Abstract

Palembang is a lowland which is dominated by swamp areas.. The problem of flooding in this area stems from a drainage network system that is almost cut off, causing high rainfall and water not flowing properly into the river. This study aims to analyze the drainage network system’s performance based on the channel’s capacity to the channel’s condition in analyzing the hydrology using the probability distribution method. The frequency suitability test was carried out using Smirnov-Kolmogorov and Chi-Square. The results showed that the rainfall was 116.74 mm/hour and the design flood discharge (Qr) at the ten-year return period was 3.684 m3/second. The carrying capacity of the discharge channel (Qs) is smaller than the value of Qr. Indicates that the existing drainage channels cannot accommodate the flood discharge, resulting in flooding. The channel at point 4 leads to the discharge channel; the capacity value of Qs is 4.0296 m3/second, while Qr is 3.684 m3/second. The calculation results can be estimated that the channel discharge capacity is smaller than the planned flood discharge, so the drainage channel capacity cannot accommodate flood flows.