Development of Temporal Rainfall Pattern for Segamat District

Abstract

The designing of rainfall temporal pattern is very important in displaying the diversity and intensity of rainfall in addition to flood estimation and planning. The main purpose of this study was to develop a temporal rainfall pattern for Segamat District. Average Variability Method, AVM which had recommended by the Australian Rainfall and Runoff were used to derive design rainfall temporal patterns for this study. The survey data for 5 minute interval from 2003 to 2012 for 4 selected rainfall stations that obtained from the Drainage and Irrigation Department, DID have been selected. In this study, the temporal rainfall pattern is built for 10 minutes, 15 minutes, 30 minutes, 60 minutes, 120 minutes, 180 minutes, and 360 minutes. The results shows the actual rainfall on the field in the form of temporal rainfall pattern. Up to 75% of the temporal patterns in the region can be classified as intermediate type while the advance and delay type are 11% and 14%, respectively. From the temporal rainfall pattern, the duration of rainfall occurs can be predicted, therefore, the probability of the flooding during the period can be estimated.