Flood damage and risk assessment for urban area in Segamat

In recent years, risk-based flood mitigation approach received more attention compared to conventional or structural approach. However, in developing countries, literatures on flood vulnerability assessment are limited especially on flood damage. In Malaysia, the assessment of flood damages is chall...

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Main Author:	Noor Suraya, Romali
Format:	Thesis
Language:	English
Published:	2018
Subjects:	TH Building construction
Online Access:	http://umpir.ump.edu.my/id/eprint/31318/1/Flood%20damage%20and%20risk%20assessment%20for%20urban%20area.pdf
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id	my-ump-ir.31318
record_format	uketd_dc
spelling	my-ump-ir.313182021-04-26T00:02:31Z Flood damage and risk assessment for urban area in Segamat 2018-08 Noor Suraya, Romali TH Building construction In recent years, risk-based flood mitigation approach received more attention compared to conventional or structural approach. However, in developing countries, literatures on flood vulnerability assessment are limited especially on flood damage. In Malaysia, the assessment of flood damages is challenging due to data scarcity. Hence, an attempt has been made to establish a flood damage assessment framework for an urban area of Segamat town, Johor. The concept of flood risk involved the elements of hazard, exposure, and vulnerability. The combination of hydrological characteristics, exposed elements, value of exposed elements, and flood damage function curve was used for estimation of flood damages. The flood depth and areal extend were obtained from flood modeling and mapping using HEC-HMS/RAS and Arc GIS. A site-specific flood depth–damage curve was developed based on land use category, socio-economic status of the flood victims and property characteristics. Due to data scarcity, synthetic method was applied to generate flood damage data based on the 2011 major flood event. Damage percentage was calculated by dividing the replacement cost by the market value of the properties and plotted against the observed flood depth. In addition to flood depth, the flood damage was also influenced by household income and property’s price. Therefore, the residential category was further divided into three sub-categories; low price house (LPH), medium price house (MPH) and high price house (HPH). Using R2 of 0.76 for commercial area and from 0.80 to 0.85 for various residential categories, the flood depth-damage curves obtained in this study were good enough and comparable with other studies. The estimated total damages for residential and commercial categories during the 2011 flood were RM456 mil and RM143 mil respectively. The expected annual damage (EAD) for residential areas (50,112 units) and commercial areas (9,318 premises) were RM12.59 million and RM2.96 million respectively. Generalized Pareto (GP) distribution model was used to estimate peak discharge of 10, 25, 50, 100, 200, 500 and 1000 ARI which were subsequently applied for deriving flood maps. Based on the GP distribution, the 2011 flood was equivalent to 42 years average recurrence interval (ARI). Flood hazard map shows that Bandar Seberang area (46,184 properties) was the most affected by flood. The flood damage risk map illustrates similar patterns where the distribution of damages were concentrates at the Bandar Seberang area with some properties suffered damages of more than RM15,000 per unit. Although it is a site-specific study, the framework can be applied to assess the potential future damages and serve as a basis for future studies on flood risk assessment in Malaysia. 2018-08 Thesis http://umpir.ump.edu.my/id/eprint/31318/ http://umpir.ump.edu.my/id/eprint/31318/1/Flood%20damage%20and%20risk%20assessment%20for%20urban%20area.pdf pdf en public phd doctoral Universiti Teknologi Malaysia School of Civil Engineering, Faculty of Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TH Building construction
spellingShingle	TH Building construction Noor Suraya, Romali Flood damage and risk assessment for urban area in Segamat
description	In recent years, risk-based flood mitigation approach received more attention compared to conventional or structural approach. However, in developing countries, literatures on flood vulnerability assessment are limited especially on flood damage. In Malaysia, the assessment of flood damages is challenging due to data scarcity. Hence, an attempt has been made to establish a flood damage assessment framework for an urban area of Segamat town, Johor. The concept of flood risk involved the elements of hazard, exposure, and vulnerability. The combination of hydrological characteristics, exposed elements, value of exposed elements, and flood damage function curve was used for estimation of flood damages. The flood depth and areal extend were obtained from flood modeling and mapping using HEC-HMS/RAS and Arc GIS. A site-specific flood depth–damage curve was developed based on land use category, socio-economic status of the flood victims and property characteristics. Due to data scarcity, synthetic method was applied to generate flood damage data based on the 2011 major flood event. Damage percentage was calculated by dividing the replacement cost by the market value of the properties and plotted against the observed flood depth. In addition to flood depth, the flood damage was also influenced by household income and property’s price. Therefore, the residential category was further divided into three sub-categories; low price house (LPH), medium price house (MPH) and high price house (HPH). Using R2 of 0.76 for commercial area and from 0.80 to 0.85 for various residential categories, the flood depth-damage curves obtained in this study were good enough and comparable with other studies. The estimated total damages for residential and commercial categories during the 2011 flood were RM456 mil and RM143 mil respectively. The expected annual damage (EAD) for residential areas (50,112 units) and commercial areas (9,318 premises) were RM12.59 million and RM2.96 million respectively. Generalized Pareto (GP) distribution model was used to estimate peak discharge of 10, 25, 50, 100, 200, 500 and 1000 ARI which were subsequently applied for deriving flood maps. Based on the GP distribution, the 2011 flood was equivalent to 42 years average recurrence interval (ARI). Flood hazard map shows that Bandar Seberang area (46,184 properties) was the most affected by flood. The flood damage risk map illustrates similar patterns where the distribution of damages were concentrates at the Bandar Seberang area with some properties suffered damages of more than RM15,000 per unit. Although it is a site-specific study, the framework can be applied to assess the potential future damages and serve as a basis for future studies on flood risk assessment in Malaysia.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Noor Suraya, Romali
author_facet	Noor Suraya, Romali
author_sort	Noor Suraya, Romali
title	Flood damage and risk assessment for urban area in Segamat
title_short	Flood damage and risk assessment for urban area in Segamat
title_full	Flood damage and risk assessment for urban area in Segamat
title_fullStr	Flood damage and risk assessment for urban area in Segamat
title_full_unstemmed	Flood damage and risk assessment for urban area in Segamat
title_sort	flood damage and risk assessment for urban area in segamat
granting_institution	Universiti Teknologi Malaysia
granting_department	School of Civil Engineering, Faculty of Engineering
publishDate	2018
url	http://umpir.ump.edu.my/id/eprint/31318/1/Flood%20damage%20and%20risk%20assessment%20for%20urban%20area.pdf
_version_	1783732165850169344

Flood damage and risk assessment for urban area in Segamat

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