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