Frequency Analysis of Annual Maximum Flood for Segamat River

Noor Suraya Romali,Zulkifli Yusop,M.J Zainorizuan,R Siti Nazahiyah,A Mohd Shalahuddin,L Alvin John Meng Siang,O Mohamad Hanifi,L Yee Yong

doi:10.1051/matecconf/201710304003

Noor Suraya Romali, Zulkifli Yusop + Show 6 more

Open Access

https://doi.org/10.1051/matecconf/201710304003

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Abstract

Several major floods had occurred in the last few decades in Segamat, causing extensive damage to properties and harm local community. For the purpose of flood risk management, this study estimated the average recurrence interval (ARI) and peak flows associated with the ARI based on the distributions of annual peak flow. The flood frequency analysis was performed for flood series data of Segamat River, at Sg. Segamat gauging station (Site 2528414) for the years 1960 – 2011. Five distribution models, namely Generalized Pareto, Generalized Extreme Value, Log-Pearson 3, Log-Normal (3P) and Weibull (3P) were tested for the 52 years flood series data. The goodness of fit test (GOF) of Kolmogorov-Smirnov (K-S) was used to evaluate and estimate the bestfitted distribution. The results obtained using Generalized Pareto distribution provided the best fit, followed by Generalized Extreme Value, Log-Pearson 3, Log-Normal (3P), and the least for Weibull (3P). The estimated peak flows for Segamat River for 50, 100 and 200 ARIs are 1362.2 m3/s, 1914 m3/s and 2642 m3/s respectively. Results can be useful as a reference for further/future flood risk assessment works in the study area.

Highlights

Nowadays, a higher frequency of extreme rainfall is expected to occur more frequently due to the climate change phenomenon [1]
The first stage is the estimation of annual maximum stream flow that based from the flow historical data for certain years [6]
A large flood had occurred in Segamat for years 2007 and

Summary

Introduction

A higher frequency of extreme rainfall is expected to occur more frequently due to the climate change phenomenon [1]. Flood had causes tremendous damages to properties [2] and may lead to the loss of human life [3]. In Malaysia, flood occur annually and affected an approximate area of 29,720 km, involving more than 4.915 million people and causing up to RM 915 million damage yearly [4]. Flood modelling has been used in flood mitigation to estimate floods associated with return periods of interest, which is called design flood. In Malaysia, a 100 year ARI has been used as a practice for designing hydraulic structures. Recently this standard has been extended to 200 years return period [6]

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