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INTEGRATION OF HYDRAULIC MODEL (HEC-RAS) AND GEOGRAPHICAL INFORMATION SYSTEM (GIS) IN DEVELOPING FLOOD EVACUATION CENTER ALONG SEMBRONG RIVER AREA NOR AZIMAH BINTI MARIMIN A thesis submitted in fulfillment of the requirement for the award of the Master’s Degree of Civil Engineering with Honors. Faculty of Civil and Environmental Engineering Universiti Tun Hussein Onn Malaysia FEBRUARY 2019

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INTEGRATION OF HYDRAULIC MODEL (HEC-RAS) AND GEOGRAPHICAL

INFORMATION SYSTEM (GIS) IN DEVELOPING FLOOD EVACUATION

CENTER ALONG SEMBRONG RIVER AREA

NOR AZIMAH BINTI MARIMIN

A thesis submitted in fulfillment of the requirement for the award of the

Master’s Degree of Civil Engineering with Honors.

Faculty of Civil and Environmental Engineering

Universiti Tun Hussein Onn Malaysia

FEBRUARY 2019

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DEDICATION

To my beloved

Dad Marimin bin Sahar,

Mother A’inah binti Abu,

Sisters Norliza, Normala and Halimah,

Fiance Hairi,

Supervisor Dr Adib and Co-Supervisor Dr Mustaffa,

Lecturers, family members and friends,

Thanks for all the supports,

May Allah bless you all.

-Sincerely, Nor Azimah binti Marimin-

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ACKNOWLEDGEMENT

First and foremost, I would like to take this opportunity to deeply praise Almighty

Allah S.W.T for His blessing that I can pass all of this moment and successfully

accomplished this thesis in time and presentably. In preparing this thesis, I was in

contact with many people, academician, and practitioners. They have contributed

towards my understanding and thoughts. I wish to express my highest gratitude to

PM Dr Mohd Adib bin Mohammad Razi and PM Sr. Dr. Mustaffa bin Anjang

Ahmad as my Supervisor and Co-Supervisor for encouragement, guidance, critics

and friendship.

Besides that I am also very thankful to staff from Department of Drainage

and Irrigation, Batu Pahat, Department of Educational Batu Pahat and Civil Defence

Agency (UTHM) for their cooperation, guidance and recommendations on

completing this thesis. Without their continued support and interest, this thesis would

not complete on time and would not have been the same as presented here. I am also

indebted to Universiti Tun Hussein Onn Malaysia (UTHM) for providing the

facilities for my research work. My appreciation also goes to the panel‟s participant

(En Saifullizan, Dr Salleh, Dr Anuar and Dr Hidayat) during the presentation of this

study.

My sincere appreciation also extends to my parents, family members, friends

(Hairiah, Jannah, Nadia, Putri and Shahiran Liyana) and those that involved directly

or indirectly for giving their full support and had provided assistance at various

occasions. Their views and advices were very useful indeed. I will never forget this

memorable time to be at UTHM all this while.

Thank you.

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ABSTRACT

Flood is a short-lived event, causes by the continuous rain that leads to overflow of

river water to river bank. The issues regarding flood event specially involving the

emergency response solution that can be viewed from the aspects of the evacuation

center and its access route. Flood evacuation center and its access route could be

managed through HEC-RAS and GIS software as both are useful instruments for

mapping and analyzing the situation. The objectives of this study are to determine

flood prone area of Sembrong River in two-dimensional (2D) view by using HEC-

RAS, to evaluate the suitability of current location of evacuation centers and to

develop a new evacuation center and its access route by using GIS. HEC-RAS was

utilized to produce an output of two-dimensional (2D) flood prone map of Sembrong

River. The area coverage for 3 meter flood and below was 104.114 km2 areas out of

1872.56 km2

of Batu Pahat area. Whereas, by using GIS technology, 3 existing flood

evacuation centers named SK Seri Bandan, SK Bukit Kuari and SK Kota Dalam

were evaluated regarding their location‟s suitability. 14 new locations of flood

evacuation center with suitable criteria such as the capacity to accommodate numbers

of people, high ground and access route were proposed for intent of rescuing and

evacuating flood victims to safer locations. Flood and evacuation center‟s location

data were then compared with the data from Malaysia Civil Defence Force. Those

results obtained were very useful tool for future flood mitigation measures and flood

evacuation planning.

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ABSTRAK

Banjir adalah peristiwa jangka pendek yang berlaku disebabkan oleh hujan yang

berterusan dan mengakibatkan limpahan air sungai ke tebing sungai. Isu-isu banjir

yang utama adalah yang melibatkan aspek pusat pemindahan dan rangkaian jalan.

Analisis pusat pemindahan banjir dan rangkaian jalannya dapat dijalankan dengan

berkesan dengan menggunakan instrumen HEC-RAS dan GIS kerana kedua-duanya

merupakan instrumen yang berguna untuk pemetaan dan analisis. Objektif kajian ini

adalah untuk menentukan kawasan limpahan banjir Sungai Sembrong dalam

pandangan dua dimensi (2D) dengan menggunakan HEC-RAS, untuk menilai

kesesuaian lokasi pusat pemindahan yang sudah tersedia dan untuk membangunkan

pusat pemindahan baru bersama rangkaian jalannya dengan menggunakan GIS.

HEC-RAS digunakan untuk menghasilkan peta banjir dua dimensi (2D) pada sungai

Sembrong. Liputan kawasan banjir sedalam 3 meter dan ke bawah ialah 104.114 km2

dari 1872.56 km2

kawasan Batu Pahat. Sementara itu, dengan menggunakan

teknologi GIS, 3 pusat pemindahan banjir seperti SK Seri Bandan, SK Bukit Kuari

dan SK Kota Dalam telah dinilai mengenai kesesuaian lokasinya. 14 lokasi baru

untuk pusat pemindahan banjir dengan kriteria yang sesuai seperti kapasiti yang

mencukupi untuk menampung bilangan penduduk, kawasan yang tinggi dan

ketersediaan rangkaian jalan dicadangkan untuk tujuan menyelamat dan

memindahkan mangsa banjir ke lokasi yang lebih selamat. Kesemua data lokasi

banjir dan pusat pemindahan dibandingkan dengan data dari Angkatan Pertahanan

Awam Malaysia. Hasil kajian ini sangat berguna untuk langkah-langkah

pengurangan banjir dan perencanaan pemindahan mangsa banjir pada masa hadapan.

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TABLE OF CONTENTS

TITLE

DECLARATION

DEDICATION

ACKNOWLEDGEMENT

ABSTRACT

TABLE OF CONTENTS

LIST OF TABLE

LIST OF FIGURE

LIST OF SYMBOLS AND ABBREVIATIONS

LIST OF APPENDICES

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CHAPTER 1 INTRODUCTION

1.1 Background of study

1.2 Problem background

1.3 Objectives of study

1.4 Scope of study

1.5 Organization of dissertation

CHAPTER 2 LITERATURE REVIEW

2.1 Introduction

2.2 Flood as natural disaster

2.2.1 Causes of floods

2.2.2 Damages due to flood

2.2.3 Malaysia‟s 2014 flood event

2.3 Evacuation centre

2.4 Hydrological Engineering Center‟s River

Analysis System (HEC-RAS)

2.4.1 Relationship between HEC-RAS and GIS

2.5 Geographical Information System (GIS)

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2.5.1 GIS analysis data

2.5.2 The importance of GIS

2.5.3 GIS in flood management

2.6 Map projection

2.7 Network analyst

2.8 Summary

CHAPTER 3 METHODOLOGY

3.1 Introduction

3.2 Methodology flow chart

3.3 Overall research plan

3.4 Preliminary study

3.5 Literature review

3.6 Data collection

3.7 Data collection of HEC-RAS flood modelling

3.7.1 HEC-RAS parameter

3.7.2 Water surface profile computation

3.8 HEC-RAS 2D flood modelling operation

3.8.1 2D flow area

3.8.2 Sembrong River‟s cross section data

3.8.3 Unsteady flow analysis

3.9 Data collection of GIS analysis

3.9.1 Coordinate and elevation tracking

3.10 GIS work flow

3.11 Data analysis

3.11.1 DEM and contour line data of Batu Pahat

3.11.2 Land use map of Batu Pahat

3.11.3 Population data

3.11.4 Flooded area data from HEC-RAS

3.11.5 Flood level determination

3.11.6 Data digitizing

3.11.7 Data conversion

3.11.8 Flood evacuation center location

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3.11.9 Route mapping

3.12 Summary

CHAPTER 4 RESULT AND DATA ANALYSIS

4.1 Introduction

4.2 HEC-RAS data analysis

4.2.1 Analysis results of cross section data

4.2.2 2D flow map

4.3 Coordinate‟s accuracy analysis

4.4 Flood map analysis

4.5 Analysis of evacuation center

4.5.1 Suitability of existing evacuation center

4.5.2 Propose of new evacuation center

4.6 Access route

4.6.1 Zone 1

4.6.2 Zone 2

4.6.3 Zone 3

4.6.4 Zone 4

4.7 Summary

CHAPTER 5 CONCLUSIONS AND RECOMMENDATIONS

5.1 Introduction

5.2 Conclusion on the research findings

5.3 Research limitations

5.4 Recommendation for future research

REFFERENCES

APPENDICES

PUBLICATION

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LIST OF TABLES

2.1 Regions affected by massive flood in 2014

2.2 Total of evacuees in states affected by 2014 flood

2.3 Cost of damages according to states

3.1 Overall research plan

3.2 Standard Manning value

3.3 Study area‟s population data

4.1 Water overflow in Sembrong River‟s station

4.2 On site and on map elevation value

4.3 Condition of existing evacuation center

4.4 Details of proposed evacuation center

4.5 List of residential area in each zone

4.6 Route distance in Zone 1 area

4.7 Route distance in Zone 2 area

4.8 Route distance in Zone 3 area

4.9 Route distance in Zone 4 area

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LIST OF FIGURES

1.1 Floods in Johor, December 2006 and January 2007

1.2 Flood prone areas in Malaysia

1.3 Flooded house in Parit Londang, Parit Raja during flood

event in November 2015

1.4 Disconnected of road during flood event in Batu Pahat

1.5 Map of study area along Sembrong River

2.1 Seven causes of flooding

2.2 Four effects of flooding

2.3 Flood caused damages to road and bridge

2.4 Flood caused damages to home

2.5 Cross sections of river shown in HEC-RAS

2.6 Schematic representation of the used computer device

2.7 Map projection in ArcGIS

2.8 Methodology for finding optimum route

3.1 Methodology flow chart

3.2 Sembrong River and its cross sectional location

3.3 Creating 2D flow area of Sembrong River

3.4 2D computational mesh for Sembrong area

3.5 HEC-RAS cross-section coordinates

3.6 Adding river station data

3.7 HEC-RAS finished computation

3.8 Coordinate tracking at Sekolah Kebangsaan Seri Sabak

Uni by using Google Earth

3.9 Leveling equipment

3.10 Leveling work to determine elevation value of choosen

point along study area

3.11 Flow chart of data collection for network analysis

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3.12 Contour line data extracted from DEM of Batu Pahat

3.13 Batu Pahat land use map

3.14 Exporting layer from RAS Mapper

3.15 Spatial analysis of DEM data

3.16 Displaying flood level

3.17 Creating path in Google Earth‟s

3.18 Access route is develop

3.19 Spatial data from Google Earth

3.20 Converting KML format into layer format

3.21 Converting layer format into Shapefile format

3.22 Adding XY coordinates data

3.23 Example location of existing evacuation center

3.24 Result of road digitizing in Google Earth

3.25 Attribute data of Batu Pahat‟s road

3.26 Validating map through topology

3.27 Rule for route featuring class

3.28 Creating new route network dataset

3.29 Selecting new route to evacuation center

3.30 Solving network analysis

3.31 Summarization of methodology

4.1 Water surface profile along Sembrong River

4.2 HEC-RAS cross-section plot

4.3 2D model flow of Sembrong River

4.4 Flood prone area of Sembrong River

4.5 Location of flood evacuation center in the flood map

4.6 Interview session with Education Officer of Batu Pahat

4.7 School visit to the proposed evacuation center

4.8 Location of proposed flood evacuation center

4.9 Potential access route to evacuation center

4.10 Access route in Zone 1

4.11 Access route in Zone 2

4.12 Access route in Zone 3

4.13 Access route in Zone

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LIST OF SYMBOLS AND ABBREVIATIONS

H

Z

Y

α

Q

V

A

R

N

K

hf

L

ho

C

GIS

DEM

HEC-RAS

DID

ADAS

JKR

UTHM

- Energy head

- Channel bed elevation above datum

- Pressure head/water depth

- Velocity weighting coefficient

- Flow rate/discharge

- Average velocity

- Area at cross section

- Hydraulic radius

- Manning roughness coefficient

- Conveyance

- Friction head loss

- Distance between adjacent cross section

- Contraction or expansion head loss

- Contraction or expansion coefficient

- Geographical Information System

- Digital Elevation Model

- Hydrological Engineering Center-River

Analysis System

- Department of Irrigation and Drainage

- Australian Diver Accreditation Society

- Jabatan Kerja Raya

- Universiti Tun Hussein Onn Malaysia

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LIST OF APPENDICES

A

B

C

D

Schematic graph of Sembrong River station

Flood location data in Batu Pahat 2004-2010

Flood location and its scenario in Batu Pahat

Registered flood evacuation center in Batu Pahat

Example of proposed evacuation center

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CHAPTER 1

INTRODUCTION

1.1 Background of study

Number of flood events has increased significantly all around the world recently.

Number of fatalities per flood event exhibited an almost constant trend during the

1980s and 1990s, but it has markedly decreased since the year 2000 despite the

significant increase in the number of floods (Parker et al., 2007). Climate changes,

changes in land use and other anthropogenic interventions are the main causes of

changes in flood risk.

Flood is the most significant natural hazard in Malaysia in terms of the affects

towards the population, frequency of the occurrences, damaged areas, the flood

duration itself and its social and economic damage. A conservative figure of RM100

million has been estimated as the average loss by flood damage per year (Mustafa,

2007; Siwar et al., 2009).

While, in Johor itself, the worst flood event happened in late 2006 and early

2007 (Gasim et al., 2010). Figure 1.1 shows floods in Johor in December 2006 and

January 2007 that had caused road, residential and agricultural areas being

submerged. Okezie & Amir (2012) confirmed that flood during that time had

displaced 110,000 people with an estimated damaged Ringgit Malaysia (RM) 0.35

billion worth of infrastructures and had caused RM2.4 billion in economic losses.

Major towns and cities suffering from the floods included Batu Pahat, Johor Bahru,

Kluang, Kota Tinggi, Mersing, Muar, Pontian and Segamat (DID, 2009). That

tragedy happened due to the heavy rainfall within a long period of time that occurred

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in the low land area. Flood event that occurred due to heavy rainfall and the impact

of large amount of surface runoff will led to the large amount of suspended solid

flow onto the river bed (Ahmad et al., 2010). That suspended solid will then become

sedimentation on the river bed which led to the changes of water level depth and

causing the river overflown and flooding.

Figure 1.1: Floods in Johor, December 2006 and January 2007 (DID, 2009)

During flood disaster response, assistance measures may include planning

routes for people to evacuate and the location of temporary facilities (Joao, 2012).

This study was conducted to develop flood evacuation center and access routes from

residential area of flood victims to the evacuation center and vice versa. Thus, by

using Geographical Information System (GIS) technology, developing of flood

evacuation center and their access routes can easily be made because GIS helps in

manipulating data in the computer, simulating alternatives and taking the most

effective decision (Ashtashil & Isha, 2011).

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1.2 Problem background

Nowadays, natural disaster such as flood has become a recurring phenomenal in most

parts of Malaysia and the world in general. Focussing on the issue of flood in

Malaysia, one of the floods prone areas are in the state of Johor as shown in Figure

1.2. Flood in January 2007 had caused 8 districts in Johor being submerged by the

flood and the worst affected areas were Batu Pahat and Kluang (DID, 2009). Flood

victims at that time were facing problems with the unavailable of treated water and

electricity supplies for many days.

Figure 1.2: Flood prone areas in Malaysia (DID, 2009)

Batu Pahat as stated as one of the affected districts in Johor has been selected

for this study. Flood events in Batu Pahat in the year of 2006 had caused many

people been evacuated to the nearest evacuation centres, damages of residential,

public infrastructure and agriculture area, and submerges of access routes in certain

area (Economic Planning Unit Johor, 2016). One of the examples was flood event in

2012, where number of flood victims rescued in Batu Pahat District increased to

International Border

State Border

Flooded Area

River

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1,629 people as at 6 pm, from 754 people with 15 evacuation centers were opened

during that time (Sinar Harian, 2012). While, Figure 1.3 shows a flooded house, in

one of villages in Parit Raja, Batu Pahat during flood event in 2015. According to

that case, three schools became evacuation center to accommodate 356 peoples

involving 100 families in that area (Berita Harian, 2015). Problems encountered

when those school buildings were not registered by Department of Social Welfare as

evacuation center and were opened without considering any criteria of suitability and

in terms of safety itself. Thus, the opening of unregistered building as evacuation

center without knowing their number of capacity will cause problems in the process

of evacuating flood victims and transferring helps such foods and other daily needs

(Aizel, M.M., Education Officer, March 27, 2018).

Figure 1.3: Flooded house in Parit Londang, Parit Raja during flood event in

November 2015 (Berita Harian, 2015)

A few decades ago, opening of evacuation center was determined according

to the construction of schools in the neighbourhood. There were some of the school

being constructed without following the standard height of land that was suitable to

deal with evacuation issues during flood period (Farhan, 2014). Other than height of

land factor, availability of access route also becomes a necessary in evacuating the

flood victims to a safer place. Australian Red Cross (2012) mentioned that the

adaptability of space for flood victim‟s elements such as walkways, altitude areas,

safety and ease of communication was an essential point of emphasis.

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The availability of safe access route is important element to be highlighted in

this study for the process of transferring flood victim to the nearest evacuation

center. Figure 1.4 shows disconnected of Batu Pahat‟s road during flood event that

has led to problems in the process of saving the flood victims and supplying them

with enough facilities. Thus, the purpose of this study instead of evaluating the

suitability of existing evacuation center‟s location, was to develop new locations of

evacuation center and their access routes with the help of HEC-RAS and GIS

software.

Figure 1.4: Disconnected of road during flood event in Batu Pahat

(Sinar Harian, 2012)

1.3 Objectives of study

The aim of the study is to develop flood evacuation centers and access routes by

using Geographical Information System (GIS) along Sembrong River area.

Therefore, the objectives are:

(i) To determine floodprone areas of Sembrong River in two-dimensional (2D)

by using HEC-RAS.

(ii) To evaluate the suitability of the existing flood evacuation center by using

GIS.

(iii) To develop new flood evacuation centers and their access route by using GIS.

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1.4 Scope of study

Study has been conducted along Sembrong River that flows through South-Eastern

part of Johor and afterward flows into Bekok River and Simpang Kanan River in

Batu Pahat. Figure 1.5 illustrates the map of studied area. Sembrong River‟s dam

provides downstream flood protection up to 100-years return period with a maximum

release of 42 cumecs. It has a drainage length of 22.3 km that covers an area of 273

km2 with elevation of 10 meters above mean sea level. The land usage activities

along this river inclusive of industrial areas, residential areas and agriculture

activities, such as palm oil mill and paddy fields (Marina et al., 2014).

Sembrong River covers some parts of Batu Pahat area. The total coverage of

Batu Pahat is 1,872.56 km2 and has a population of 383,391 inhabitants (Department

of Statistic Johor, 2017). Batu Pahat has received an average rainfall of 2 millimetres

per day group and had often experienced the tidal and water level rise phenomena

around January to February as stated by Malaysia Meteorological Department.

Figure 1.5: Map of study area along Sembrong River

(Google Earth)

In this study, data collection was divided into two sections that were data for

HEC-RAS hydraulic model and data for GIS analysis that were necessary for

floodprone area data and evacuation process respectively. Geometry and flow data

were needed to determine the floodprone area. For GIS analysis, spatial, attribute and

empirical data were the three main elements in accurately generating all the outputs.

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Spatial data such as DEM, land use map and route map of Batu Pahat were

used in identifying the geographic location of features and boundaries on Earth.

Spatial data are often accessed, manipulated or analysed through GIS. Next, attribute

data are data that have quality characteristics that meet geographic features such as

descriptive, quantitative and qualitative. For this research, attribute data for GIS

analysis included road name, road length and population. On the other hand,

empirical data such as route and topology were used as supportive data to spatial and

attribute data in analysing the data systematically.

1.5 Organization of dissertation

This report consisted of five chapters. The first chapter was about the introduction of

this study. It included the background of study, problem background, objectives of

study, scope of study and the organization of dissertation. In addition, this chapter

provided the overview about this study. The second chapter focused on the literature

review. Literature review is the researches that have already been published from

previous researchers. The topics that had been discussed were about flood as a

natural disaster in Malaysia, factors of floods and its losses, evacuation centres,

Digital Elevation Model (DEM), Global Positioning System (GPS), Coordinate

System, HEC-RAS flood analysis, Geographical Information System (GIS) and

summary of the literature review chapter.

Next, chapter three explained the methodologies used in conducting this

study. This chapter included methodology in the analysis of Sembrong River‟s

floodprone area by using HEC-RAS and analysis of evacuation process using GIS.

Then, chapter four was a presentation of the findings and the analysis of the studies

that have been done. This chapter described the data analysis based on the methods

described in chapter three. The suitability of flood evacuation centre was determined

by using several criteria.

Chapter five as the last part of this report conclude the finding according to

objectives that have been determined in chapter one. Other than that, some

recommendations were also included in this chapter for better improvement in the

future research.

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CHAPTER 2

LITERATURE REVIEW

2.1 Introduction

This chapter was about reviews on all research scopes including flood as natural

disaster, causes of flooding and its losses, evacuation center, Hydrological

Engineering Center River Analysis System (HEC-RAS), Geographical Information

System (GIS), Map Projection and Network Analyst. These reviews were based on

reading sources such as books, journals, articles, trusted internet sources and

previous projects that related with this research.

2.2 Flood as natural disaster

Nowadays, the main cause of irrecoverable damages of worldwide is natural disaster

(Vorogushyn et al., 2012). Natural disaster is said to be a hazardous threat that occurs

naturally and gives negative effect on human life or properties (Stephen, 2018). One

of the most common natural disasters that happen all around the world is flood.

Flood is a natural phenomenon where the land is covered by water that overflows by

the inland water bodies. Pradhan & Youssef (2011) cited that flood has caused

considerable damages to high-ways, settlement, agriculture and livelihood. There are

several definitions of floods that we can take into accounts so that it can help us to

see the overall picture of how flood occurs. Other theoretical explanation states that

flood is usually caused either by the continuous rain that causes a greater quantity of

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water than normal, or overflows of river water to the river bank, or both happening at

once (Balkema et al., 1993).

Flood is usually a local short-lived event that can happen suddenly and

sometimes with little or no warning. It is usually caused by intense storms that

produce more runoff for an area to store or a stream to sustain within its normal

channel. Changes in global climate and land use have increased the severity and

frequency of floods all around the world (Akinci & Erdogan, 2014). While, rivers

can also cause flood on its surroundings when the dams failed, when ice or a

landslide temporarily block the course of the river channel, or when snow melts

rapidly (Shakeel, 2018). In the year of 2014, there was a rapid case of flood that

occurred from the Northeast monsoon which hit certain countries such as Indonesia,

West Malaysia, Southern Thailand and later Sri Lanka in South Asia (Zainal &

Sunitha, 2015). Table 2.1 shows the affected regions due to the massive flood in

2014, with its estimated total of evacuees.

Table 2.1: Regions affected by massive flood in 2014

(Zainal & Sunitha, 2015)

Country Facilities Evacuees

Indonesia

0

120,000

Malaysia 21 237,037

Thailand 15 10,000

Sri Lanka 39 50,832

Total 75 417,869

With focused on the Malaysia case, the massive flood hit the country from

15th of December 2014 to 3rd of January 2015. During the flood event, more than

200,000 Malaysians were affected and 21 people were killed (Asia One, 2015). The

flood also had caused the flood victims a great devastation, especially when it comes

to loss of homes and other infrastructures.

2.2.1 Causes of floods

Flood occurs in many situations that making the information involving the flood

prediction as always considered arbitrary. This is due to dynamicity of flood itself

that affected by the environmental changes and even the internal and external factors

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of its occurrence. The most common factors that lead to the occurrence of flood in

Malaysia are urbanization and lose of water catchment (Chia, 2005). A research

carried out by Kong et al., (2010) on urban flooding as shown in Figure 2.1 verified

that 28% of people believed that flood was due to improper drainage system, 20%

thought the cause was pollution, 18% said it was the management or urbanization

and environment factor at 16%, 11% of respondents agreed that weather was the

causative agent and 7% chose dam break as a reason.

Figure 2.1: Seven causes of flooding

(Kong et al., 2010)

One of the issues regarding the environment is forest destruction or

deforestation activity. Van Kooten & Bulte (2000) said that deforestation was the

conversion of forest to an alternative permanent non-forested land use such as

agriculture, grazing or urban development. Upon the occurrence of an unplanned

deforestation, the activity will sometimes cause a forest ecosystem being

inconsistent. This can cause floods even in forested areas due to incapability of

sustaining excess water which cannot be absorbed by the tree roots. Thus,

deforestation makes the soil becomes weaker and exposed to soil erosion. Soil

erosion is defined as the wearing of topsoil and since it is the top layer of soil, it is

the most fertile and contains the most organic, nutrient-rich materials. It indirectly

can cause the catchment area to be unable of withstand certain amount water volume

and this will potentially cause flooding to occur in the catchment area.

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2.2.2 Damages due to flood

Flood losses in terms of loss of life and damage to properties are substantial

as a result of seasonal floods occurring almost annually in one part of the country or

another. Vinet (2008) stated that damages of home, shops and industries were the

effects of flooding. The research concluded that flood victims have problem with the

cost of repair and some small shops did not reopen after the disaster.

Research by Kong et al., (2010) stated that more than 33% of people during

their research agreed that water damages to house, structures and appliances were

some of the effects of floods. Loss of income due to closing of business was another

effect of floods. Figure 2.2 shows that about 25% of people agree with this fact and

17% believe that transport disruption is another effect of flood (Kong et al., 2010).

Figure 2.2: Four effects of flooding

(Kong et al., 2010)

Other than all the consequences of flood that can be seen which involve

property damage, social chaos and death, there are also negative effects of flood as

follows:

(i) Destruction of agricultural crops

Agricultural crops will be destroyed by floods that hit the area. It results in

huge losses to farmers as well as directly to consumers due to the effects of

food shortages. Estimates of the areas and crops affected area were made

from draft flood extent outline maps and other estimates from the

Environment Agency (EA) and by statistical analysis at 1 kilometre scale

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