The Development of Rainfall Temporal Pattern for Kuantan River Basin

Abstract

One of the design rainfall event used in flood estimation is rainfall temporal pattern that gives the proportion of total rainfall in different periods within a given duration. The study focuses on developing a temporal rainfall pattern for the Kuantan River Basin in Pahang. According to Urban Stormwater Manual Second Edition (MSMA 2) that used as guideline for designing stormwater in Malaysia, rainfall temporal patterns are divided by region. In this study, the developments of rainfall temporal pattern in Kuantan River Basin are based specifically on rainfall station in this river basin. The Average Variability Method (AVM) that used in MSMA 2 and recommended by the Australian Rainfall and Runoff were used in developing rainfall temporal pattern for this study. The rainfall data of every 5 minutes for 16 years starting from 2000 to 2015 were gathered from Department of Irrigation and Drainage (DID) for purpose of study. In this study, the rainfall temporal pattern is deriving for 15 minutes, 30 minutes, 60 minutes, 120 minutes, 180 minutes and 360 minutes. The results show the significance differences of the rainfall temporal patterns between the results from this study and available value in MSMA 2 for the region of Pahang (Region 2). Therefore, each specific rainfall station has its own reliable rainfall temporal pattern that crucially important for flood estimation in Kuantan River Basin for future development plan