Emerging Livelihood Vulnerabilities in an Urbanizing and Climate Uncertain Environment for the Case of a Secondary City in Thailand

Increasing flood risks in Thailand are leading to new challenges for flood management and subsequently for livelihoods, which are still significantly agricultural. Policy makers prefer building flood protection infrastructure over utilizing non-structural measures like urban planning regulations to mitigate risks. We argue that unplanned urbanization intensifies flood risks and livelihood vulnerability and may even create new poverty patterns in peri-urban areas. However, urbanization can also strengthen the adaptive capacity of people in flood risk areas by providing more secure employment opportunities. We assess the livelihood vulnerability of Pra Lab, a peri-urban area of Khon Kaen City in Northeast Thailand, using a qualitative and quantitative analysis. The study relies on a vulnerability index developed from a household survey and rainfall statistics, complemented by household in-depth interviews. We further identified factors of unplanned urbanization in Khon Kaen City and Pra Lab through interviews with relevant local government offices. Our findings show that Pra Lab’s household livelihoods are moderately vulnerable to flood due to high financial (i.e., income, debts) and physical vulnerability (i.e., housing, urban systems, infrastructure). Major factors of unplanned urbanization that contribute to flood risks are lack of land use regulations, inefficient monitoring of land and house elevations, reduced pervious surfaces, ineffective water governance and insufficient wastewater treatment.


Introduction
Khon Kaen City (KKC), a secondary city in Northeast Thailand, has rapidly urbanized over the past 20 years without an effective and ecologically sound development plan. As the city's margins have expanded into nearby rural areas, people's livelihoods have shifted [1]. Since the 1960s, Thailand's National Economic and Social Development Plans (NESDP) fostered economic growth and regional integration in secondary cities, driving KKC's urban growth [2]. Today, the Thai government envisions KKC as an important logistical and economic hub of the region [3]. However, urban growth in KKC occurred widely unregulated; the lack of land use regulations for over ten years led to vast land conversions [4], which caused a change in the city's physical infrastructure and reduced essential ecological buffers. Pervious surfaces have gradually diminished and new infrastructure has blocked the natural floodway.
KKC endures more frequent and severe floods; precipitation over the past decade has increased in intensity, that is, more days with intense rainfall (about 8% above the 30-year average of 1299.9 mm) and decreased in number of days (15% below the annual average of 95 days) [5]. Urban planning Figure 1. Map of Khon Kaen City (KKC) and its peri-urban area, including Pra Lab; reproduced from [9].
Since the 1990s, Thailand experienced quick economic growth and rapid urbanization with a drastic reduction in poverty [10]. The urban population grew from 32 percent in 2000 to 53 percent in 2017 [10]. During the same time span, poverty dropped from 42 percent in 2000 to 10 percent in 2014 [10]. Despite the positive economic benefits of urbanization, there are limitations. Poverty and inequality are expected to become more volatile due to decreasing agricultural prices and ongoing climate risks [11].
KKC experienced similar growth and socio-economic changes. In the past decades, the city transformed into a major logistic and economic hub for regional integration due to three central developments [2]: the Thai government's NESDPs that attracted numerous Chinese-Thai investors and increased rural to urban migration; KKC's distinctive location as the geographic center of Northeast region; the establishment of the first university in the region in 1964. The global trend of declining labor force in the agricultural sector is also reflected in Thailand [12,13]. In urban centers, younger people (below 25) enter the nonfarm labor market in greater numbers [14,15].
Climate variation creates further challenges for PUKKC's urban growth and people's livelihoods. In the past 30 years, incidents of higher rainfall have increased in Thailand [16] as they have in other parts of Southeast Asia [7], intensifying floods. In 2011, the country was hit by a 100-year flood that caused the death of over 800 people and vast economic damages of at least US$45 billion [17].
Flood-prone Pra Lab is bordered by two major rivers, Chi and Phong, which are connected through Pra Keu Stream, historically suitable for rice farming (see Figure 2). However, changes in precipitation patterns [5,16] have turned agriculture into an uncertain and risky livelihood. In October and November 2017, severe floods destroyed the total crop of 8022 rai or about 1283 hectares of farmland in Pra Lab and affected the livelihoods of 351 households [18]. In the past, typical annual monsoons resulted in minor flooding but in 2004, 2008 and 2011, PUKKC experienced more substantial floods [19], which occur when there is a combination of river overflow and rainwater runoff from the higher situated municipalities. In 2011, floodwater remained for up to 90 days in Pra Lab [1], critically constraining people's access to key infrastructure and public services such as roads, health centers, food markets and schools [1]. Moreover, high rates of diarrhea, pneumonia, dermatitis and dengue fever, recorded at the local hospital in Pra Lab in 2011, indicated a direct link of contaminated floodwater to the communities' health [1]. have in other parts of Southeast Asia [7], intensifying floods. In 2011, the country was hit by a 100year flood that caused the death of over 800 people and vast economic damages of at least US$45 billion [17]. Flood-prone Pra Lab is bordered by two major rivers, Chi and Phong, which are connected through Pra Keu Stream, historically suitable for rice farming (see Figure 2). However, changes in precipitation patterns [5,16] have turned agriculture into an uncertain and risky livelihood. In October and November 2017, severe floods destroyed the total crop of 8022 rai or about 1283 hectares of farmland in Pra Lab and affected the livelihoods of 351 households [18]. In the past, typical annual monsoons resulted in minor flooding but in 2004, 2008 and 2011, PUKKC experienced more substantial floods [19], which occur when there is a combination of river overflow and rainwater runoff from the higher situated municipalities. In 2011, floodwater remained for up to 90 days in Pra Lab [1], critically constraining people's access to key infrastructure and public services such as roads, health centers, food markets and schools [1]. Moreover, high rates of diarrhea, pneumonia, dermatitis and dengue fever, recorded at the local hospital in Pra Lab in 2011, indicated a direct link of contaminated floodwater to the communities' health [1].

Urbanization, Climate Change, Vulnerability and Poverty
Political ecologists identify increased floods not only as a result of climate change and heavy rainfall but also as outcomes of political processes [21]. Unplanned urban growth with mismanaged infrastructure development and land use changes reflects those outcomes [22,23]. In the context of this study, we interpret unplanned urbanization as a result of weak urban governance as well as the absence, or insufficient implementation, of important planning regulations for example, land use plans. Urbanization can be described as a transformative process rather than a fixed state and its negative impacts are closely intertwined with global environmental change [24]. In an urbanizing Asia, Friend and Thinphanga [25] identified a negative correlation between investment in the conversion of floodplains and the conservation of natural waterways as flood protection. Roachanakanan [26] argued that wetlands, which have an essential function as floodways, have widely disappeared in Thailand because policy makers prefer structural to non-structural measures, for example, building more floodwalls rather than strengthening urban planning regulations. A complex systems and actor-oriented approach that goes beyond site-specific measures may be required to respond to emerging vulnerabilities caused by urbanization and climate change [25].

Urbanization, Climate Change, Vulnerability and Poverty
Political ecologists identify increased floods not only as a result of climate change and heavy rainfall but also as outcomes of political processes [21]. Unplanned urban growth with mismanaged infrastructure development and land use changes reflects those outcomes [22,23]. In the context of this study, we interpret unplanned urbanization as a result of weak urban governance as well as the absence, or insufficient implementation, of important planning regulations for example, land use plans. Urbanization can be described as a transformative process rather than a fixed state and its negative impacts are closely intertwined with global environmental change [24]. In an urbanizing Asia, Friend and Thinphanga [25] identified a negative correlation between investment in the conversion of floodplains and the conservation of natural waterways as flood protection. Roachanakanan [26] argued that wetlands, which have an essential function as floodways, have widely disappeared in Thailand because policy makers prefer structural to non-structural measures, for example, building more floodwalls rather than strengthening urban planning regulations. A complex systems and actor-oriented approach that goes beyond site-specific measures may be required to respond to emerging vulnerabilities caused by urbanization and climate change [25].
Marshall et al. [27] have and Ravetz et al. [28] have identified peri-urban areas as particularly vulnerable to the implications of urbanization such as poverty and social displacement. Features of peri-urban areas are low population density, small landholdings, a lack of spatial governance, scattered settlements, mainly agricultural but also diverse livelihoods, uncoordinated conversions of agricultural to residential land development, environmental degradation and a lack of service provision [27,28]. Thailand's peri-urban areas are in particular prone to land conversions of agricultural to residential and industrial land [29].
Together with increasing climate hazards, unregulated urbanization exacerbates livelihood vulnerabilities in peri-urban areas in Asia [30,31]. A case study in Da Nang, Vietnam, describes how infrastructure expansion and rainfall pattern changes increase flood risks and impact the livelihoods of peri-urban communities, who are predominantly agricultural [30]; particularly the peri-urban communities' low skills for nonfarm jobs constrain their capacity to adapt to floods [30]. A case study in Surat, India, also identifies a high physical and financial vulnerability to flood for peri-urban households, who rely on farming or daily wage labor as major source of income [31].
The Asian Development Bank [32], Ferre et al. [33], Ravallion et al. [34] and the World Bank [35] have diverse perceptions on the impact of urbanization on poverty reduction. While the Asian Development Bank emphasizes that urbanization can be a positive factor in growth and poverty reduction [32] by providing new employment opportunities, others stress [33][34][35] that urbanization can also contribute to new urban poverty patterns such as inadequate access to basic services. Despite the positive aspects of urbanization, the aftermath of substantial floods like the 100-year flood in Thailand in 2011 showed that the livelihood only worsened of those, who were most affected and already poor [36].
In this paper, we aim to understand the relationship between urbanization, climate risk, vulnerability and poverty in KKC, presented in a case study in Pra Lab. Our study has two major objectives: (i) assess the livelihood vulnerability of Pra Lab's communities using a Livelihood Vulnerability Index (LVI); (ii) analyze key problems of unplanned urbanization in KKC that contribute to flood risks and influence the livelihood vulnerability of Pra Lab communities. We argue that the outcomes of unplanned urbanization contribute to the magnitude of floods and consequently to the impact on livelihoods, particularly in flood risk and peri-urban areas. If these livelihood vulnerabilities continue to increase, new urban poverty patterns may emerge.

Conceptual Frameworks
In this research, we have used the Climate Resilience Framework (CRF) and the Sustainable Livelihood Approach (SLA) as conceptual frameworks. The CRF assesses vulnerabilities and risks, identifies resilience strategies and initiates an inclusive learning process to formulate measures and actions that can tackle the uncertainties of climate change in an urban environment [37]. The framework defines urbanization as a transformative process [37]. The CRF draws more on resilience than adaptation and points to the interaction of urban systems, agents and institutions [38]. Urban systems (both ecosystems and infrastructure systems) are affected by climate impacts and effect social agents (both individuals and organizations), who can plan and address climate effects directly [38]. Institutional structures can restrict and support the actions of agents [38].
The SLA assesses five types of assets or capitals, that is, human, social, natural, physical and financial [39], as well as their vulnerability context such as shocks, trends or seasonality [40]. The SLA defines vulnerability as 'lack of resilience to changes that threaten welfare . . . [which] can take form of sudden shocks, long-term trends, or seasonal cycles . . . [that] usually bring increasing risk and uncertainty' [41] (p. 5). The degree of vulnerability is based on external threats to the welfare of households, individuals and communities [42]. Poverty is hereby recognized as more than income or consumption poverty but as multidimensional aspects of changing socio-economic wellbeing [41].

Methods
Our research employs a quantitative and qualitative approach: (i) a review of relevant literature and public documents; (ii) a household survey; and (iii) in-depth interviews with households and policy-makers. Between February and April 2017, we prepared the study by reviewing secondary data including plans, maps and documents of urbanization patterns, historical climate data and water and land management in PUKKC. Concurrently, we held preliminary meetings in PUKKC with five municipalities in PUKKC, including KKCM and Pra Lab, as well as the Water Resource Management Research Center at the Faculty of Engineering, Rajamangala University of Technology Isan and the Department of Civil Engineering at the Faculty of Engineering, Khon Kaen University. Through these meetings we collected further review material and received suggestions for suitable interview partners.

Household Survey
We prepared a household survey to create a LVI. The index is embedded in the SLA, which assesses different impacts of flood on livelihoods in the context of urbanization by integrating multiple issues, such as flood frequency and dependency on agriculture as major source of income, into one index [43]. Contrary to vulnerability assessments for climate projections, the LVI measures the strength of the current livelihoods of communities and their strategies to address climate related impacts [43]. In addition, we developed the LVI-IPCC using the Intergovernmental Panel on Climate Change's (IPCC, Geneva, Switzerland) three contributing factors to vulnerability-exposure, sensitivity and adaptive capacity. The calculation of the two indices are based on a study developed and tested first by Hahn et al. [43] in Mozambique. Our study relies predominantly on primary data, collected through a survey with 236 households and a review of rainfall statistics; the data of nine in-depth interviews with selected households complemented the analysis of the LVI.
We developed a list of 45 indicators or sub-components a priori for the five assets of the LVI and its 11 major-components (see Appendix A, Table A1), defined through secondary data sources and the purpose of this study. The five assets are human, social, natural, physical and financial. The 11 major-components are health, livelihood strategy, education, land, natural resources, natural disasters and climate variability, socio-demographic profile, social networks, housing and means of production, urban systems and finance and income. We used this list of indicators to create a household survey with 57 closed questions; these questions were first developed in English and then translated into Thai.
We tested the survey in the field, revised the questionnaire and conducted the survey with 236 households over eight days in June 2017. We selected households based on three criteria: (i) most often flooded villages, that is, 14 out of 19, at the suggestion of the Sub-District Head of Pra Lab; (ii) most often flooded streets, identified by the heads of the villages; and (iii) availability at the time the survey was conducted. The second author, a native Thai speaker and five Thai students from Mahasarakham University (MSU, Kantharawichai, Thailand), who spoke the local dialect, surveyed the households one-on-one. The survey days started between 6 to 7 am and lasted no longer than four hours; one questionnaire took between 15 to 40 min. Since many household heads had only primary education, questionnaires were verbally administered. Table 1 shows the demographics of Pra Lab survey respondents.
The data entry of the collected survey questionnaires was carried out by the second author and the five students from MSU using Microsoft Excel. Each question that was answered with "yes" was coded with 1; each question that was answered with "no" was coded with 0. The data was calculated by percentage or average depending on the related indicator. The vulnerability indices were calculated by both authors evaluating the data using Microsoft Excel. We adopted the LVI and LVI-IPCC equations from the formulas developed by Hahn et al. [43]. The LVI applies a balanced weighted average [44] approach where each sub-component contributes equally to the overall index, although each major component has different numbers of sub-components [43]. To standardize the sub-components, Hahn et al. [43] used the equation of the human development index of the United Nations Development Programme [45], which is used to calculate life expectancy [43]: where s P is sub-component for Pra Lab P and s min and s max are the minimum and maximum values for each sub-component. Subsequently, to standardize the sub-component values, we calculated the value of each major component using the following equation [43]: where M P = one of the 11 major components for Pra Lab P; index SPi represented the value of the sub-component s indexed by i of major component M P ; n is the number of sub-components in each major component. The major components are scaled from 0 (least vulnerable) to 1 (most vulnerable). After the calculation of the values for each of the 11 major components for Pra Lab, they were averaged or aggregated to values for the five livelihood assets (Human Capital (H), Natural Capital (N), Social Capital (S), Physical Capital (P) and Financial Capital (F)) using Equation (3), before applied in equation (4) to obtain the weighted average LVI for Pra Lab. The five assets are scaled from 0 (least vulnerable) to 1 (most vulnerable) [43]: where LVI P is the Livelihood Vulnerability Index of Pra Lab P; w Mi is the weight of each major component (w H w N w S w P w F ), which are the weight values of each of the five livelihood assets or capitals. We aggregated the major components to values for the five livelihood assets before obtaining the weighted average LVI. The LVI was scaled from 0 (least vulnerable) to 1 (most vulnerable). The LVI-IPCC was calculated with the same Equations (1)-(3) that were applied for the calculation of the sub-components and five livelihood assets. The following equation was used to calculate the three contributing factors of the LVI-IPCC [43]: where CF P is an IPCC defined contributing factor, that is, exposure, adaptive capacity and sensitivity, for Pra Lab P; M Pi are the major components for Pra Lab indexed by i; w Mi is the weight of each major component; and n is the number of major components in each contributing factor. Contributing factors are on a scale from 0 (least vulnerable) to 1 (most vulnerable). Once the three contributing factors to vulnerability were calculated, they were combined using the following equation [43]: where LVI-IPCC P is the LVI for Pra Lab P expressed using the IPCC vulnerability framework; e is the value for exposure of Pra Lab P (equivalent to the major component "natural disaster and climate variability"), a is the value for adaptive capacity of Pra Lab P (weighted average of the major components: livelihood strategies, education, socio-demographic profile, social networks, finances and income and housing and means of production) and s is the value for sensitivity of Pra Lab P (weighted average of the major components: health, land, natural resources and urban systems). The scale of the LVI-IPCC ranged from −1 (least vulnerable) to 1 (most vulnerable).

In-Depth Interviews
After completing the survey data collection and evaluation, we conducted in-depth interviews with nine household heads in Pra Lab as well as with 14 government officers between June and July 2017. We selected household interviewees (see Table 2) based on significant answers provided in the survey, such as indication of low annual household income or high number of experienced floods. We selected government interviewees based on suggestions during meetings with different municipalities and university departments in KKC prior to the data collection. Government interviewees were affiliated with following offices: We audio recorded all interviews and took notes during the interviews. The second author interviewed the subjects in Thai, intermittently translating to the first author, so that she could generate additional questions during the interviews. Since we did not speak the local dialect, a student from MSU helped to conduct the household interviews; interviews with government officials were carried out in Thai. Interviews lasted up to 60 min. The second author summarized the interviews, which were filtered by relevance, using the audio recordings and personal notes. We applied a qualitative content analysis, which is a technique for systematic text analysis through the formulation of categories [46], to evaluate the interview data.
The household interviews complemented the quantitative analysis of the vulnerability indices. We developed a range of 68 open-ended questions concerning flood and its impacts, divided into five stages (i.e., before flood, during flood, flood loss and response, recovery, aftermath). A sample question in the first stage: 'Have you experienced any severe floods before in Pra Lab? If so, how many times?' (see Appendix B) We loosely followed the questionnaire, adjusting questions to the flow of the interview or even skipping questions that were not relevant to the respondent. The first author analyzed the interview data by sorting the information to categories, based on the 11 major components of the LVI.
The government interviews supported the identification of key problems of unplanned urbanization in PUKKC. We developed a range of 17 topical open-ended questions regarding urban planning and governance of water and land use, as well as flood protection in PUKKC. A sample question: 'How do you think poor land use contributes to flooding in Pra Lab?' During the interviews, we became more specific if we expected the office was more knowledgeable on a specific subject area. The first author sorted the interview information by forming two major categories (i.e., reasons for flood, challenges of flood). These two major categories had several sub-categories such as land use changes or water management. Next, she analyzed the two major categories by sorting again major infrastructure problems of unplanned urbanization in PUKKC.

Survey Results
The overall livelihood vulnerability (LVI) for Pra Lab communities had a value of 0.375 (see Table 3 and Appendix A, Table A2) (0 = least vulnerable; 1 = most vulnerable), which means that Pra Lab is moderately vulnerable to the impact of flood. The physical (0.503) and financial vulnerability (0.485) were highest, followed by the natural (0.359) and human vulnerability (0.357); the social vulnerability (0.257) was lowest (see Table 3, Figures 3 and 4).
Our findings showed that Pra Lab's physical vulnerability index was highest. Although most buildings are durable (concrete) (0.013), long durations of flooding (more than seven days) in the area (0.768) and in houses (0.814), create dangerous physical conditions. Inadequate access to roads and streets in the event of severe flooding for more than half of the surveyed households (0.589) also contributed to the high index. Moreover, the community lacks an adequate wastewater treatment system (0.920).     Our findings showed that Pra Lab's physical vulnerability index was highest. Although most buildings are durable (concrete) (0.013), long durations of flooding (more than seven days) in the area (0.768) and in houses (0.814), create dangerous physical conditions. Inadequate access to roads and streets in the event of severe flooding for more than half of the surveyed households (0.589) also contributed to the high index. Moreover, the community lacks an adequate wastewater treatment system (0.920).
The financial vulnerability index was second highest. Although the surveyed households areas of the national poverty line-not considered poor, more than half of the surveyed households (0.591) have a net income that is lower than 100,000 Thai Baht or about USD$ 3187 per year (1 USD = 31.3788 Thai Baht as of 6 March 2018 [47]), enough for a hand-to-mouth existence but inadequate for accruing economic buffers. Many people had no insurance or received insufficient government compensation to recover losses (0.523), thus accumulated large financial debts (0.523) from flood damages and reported a significant income reduction due to agricultural production losses (0.773).
Pra Lab's human asset vulnerability was moderate to high compared to the other four assets. The high flood impact on rice and fish farming (0.704) and dependency of half of the surveyed households on an agricultural livelihood as their major source of income (0.506) contributed most to Pra Lab's human vulnerability. More than half of the respondents also indicated that they use more The financial vulnerability index was second highest. Although the surveyed households are-as of the national poverty line-not considered poor, more than half of the surveyed households (0.591) have a net income that is lower than 100,000 Thai Baht or about USD$ 3187 per year (1 USD = 31.3788 Thai Baht as of 6 March 2018 [47]), enough for a hand-to-mouth existence but inadequate for accruing economic buffers. Many people had no insurance or received insufficient government compensation to recover losses (0.523), thus accumulated large financial debts (0.523) from flood damages and reported a significant income reduction due to agricultural production losses (0.773).
Pra Lab's human asset vulnerability was moderate to high compared to the other four assets. The high flood impact on rice and fish farming (0.704) and dependency of half of the surveyed households on an agricultural livelihood as their major source of income (0.506) contributed most to Pra Lab's human vulnerability. More than half of the respondents also indicated that they use more than 50% of their harvest for their own consumption (0.640). At least one household member is working outside of Pra Lab for almost half of the surveyed households (0.458). This was significant for some farmers to prevent higher livelihood losses during floods. A transition from rural to urban livelihood appears, however, more challenging for the majority, as more than two thirds of the surveyed households' heads have only primary school education (0.873).
The health component index (see Figure 4) was relatively low (0.223), although data we obtained from the Regional Environmental Office 10 shows that Pra Keu stream had a very poor to extremely poor water quality index in 2013 [48]. Despite that, there is a lack of evidence of possible community health consequences due to the polluted water of Pra Keu stream, when inundated in the event of heavy rainfall.
The natural vulnerability was moderately high since the majority (0.700) of the surveyed households have small land ownership (less than 10 rai or 1.6 hectares) and can only cultivate the 1st and/or 2nd of the maximum of three crops per year (0.958).
The social vulnerability was lowest. The low-moderate vulnerability of the dependency ratio index (0.329) reflects that the proportion of people between the age of 15 and 65 was twice as high as the proportion of those below 15 and above 65 years among the surveyed households. The neighborhood solidarity during flooding was relatively good among the surveyed households in Pra Lab (0.114), although one third (0.338) of them indicated not engaging in neighborhood-support-networks for floods.
The LVI-IPCC was low with a value of −0.069 (see Table 4); the scale of the LVI-IPCC ranges from −1 (least vulnerable) to 1 (most vulnerable). The contributing factor of exposure to the impact of flood was low for Pra Lab (0.217) (see Figure 5) because the index relies partly on an indicator that states the number of severe floods as experienced by the surveyed households and announced officially as disaster; minor floods that come with the annual monsoon or not announced as a disaster were excluded in the exposure index and thus, may be unsuitable. We considered the usage of official flood frequency records in Pra Lab not suitable, because these statistics also include only floods officially announced as a disaster. The sensitivity factor to the impact of flood was significantly high (0.407), mostly due to the high vulnerability index of the land and urban systems components. At the same time Pra Lab's communities' adaptive capacity was moderately high (0.387) (see Figure 5). Pra Lab's low social vulnerability index is reflected in the high contributing factor of adaptive capacity and indicates that the communities are able to support each other despite the absent of efficient and effective governmental support. The high adaptive capacity also shows flexibility to implement adaptive strategies, which could consequently strengthen financial stability.

Natural Resources Urban Systems Exposure
Natural Disaster and Climate Variability 0.217 LVI-IPCC = (Exposure − Adaptive Capacity) × Sensitivity −0.069 Note: Index values were interpreted as relative values to be compared within the research sample only.
. Figure 5. Pra Lab vulnerability for the three LVI-IPCC contributing factors. Figure 5. Pra Lab vulnerability for the three LVI-IPCC contributing factors.

Interview Results
In a qualitative content analysis, we first elaborated the quantitative analysis of our vulnerability indices with data from household interviews and then identified key infrastructure problems of unplanned urbanization in PUKKC.

Interviews with Households
For people who relied primarily on farming, physical vulnerability was inextricably linked to financial vulnerability. Interview respondents, most of which were farmers (57%), pointed out that floodwater reached up to two meters deep on farms and an average of 30 centimeters in houses during the most severe flood in 2011 and remained for four and three months, respectively. Most interviewees felt constant stress and some also believed that the foul-smelling polluted water caused them skin infections. A few people also had to move temporarily to other houses. Floods often come shortly before the harvest time between October and November, destroying the total crop.
Before flooding increased, debts from agricultural investments were often already an issue, as one interview respondent stressed. Government compensations for flood damages, which are capped at 300,000 Thai Baht or US$ 9558, were insufficient for several interview respondents to recover from the flood losses. The money was often used to cover immediate needs such as food expenses during floods but could not compensate for lost investments. Some interviewees indicated that they had to borrow money from the Ministry of Agriculture and Cooperatives, a bank, or even a loan shark with high interest rates.
Growing climate risks, financial insecurity and expenses for higher education for the farmers' children may reduce the number of yearly crops even more and force them to sell or rent out their land permanently, as one interview respondent emphasized. Several interviewees believe that households, who rely mainly on farming, are most affected by floods. They also foresee a growing transition from rural to urban livelihood practices in Pra Lab, since climate risks are growing and young Thais prefer nonfarm jobs with a regular income to physically demanding farm work with income instability.

Interviews with Policy Makers
Based on the results from interviews with government officials, we found that unplanned urbanization in PUKKC contributes to the magnitude and extent of flooding in Pra Lab and influences the livelihood vulnerability. We identified these following key infrastructure problems: Land use plan: An official from KKCM emphasized that an absence of land use regulations allowed rapid land use changes and resulted in a significant reduction of green areas in PUKKC. He pointed out that new buildings and roads prevented rainwater absorption and increased the frequency and severity of floods. After the 100-year flood in 2011, a new city land use regulation was finally negotiated, as an official from PDPT explained. The new plan has been in an approval process since 2015 and is expected to be enforced by 2019/20. This strategy will turn KKC into a compact city center of major economic growth. Western PUKKC will be designated as rural residential and agricultural, while Eastern PUKCC, including Pra Lab, will become a rural and agricultural conservation area. He noted that this would prevent further infrastructure development and maintain the area as wetland and farmlands.
Impervious areas in KKC: A KKCM official explained that KKC has an impervious area of 80 percent in 2017. An official from PDPT observed that the increasing loss of pervious surfaces in KKC contributes to the rainwater runoff from the city to Pra Lab. The major road drainage piping system in KKC, as the KKCM official also stated, was designed for impervious areas below 10 percent and followed criteria from 1997. During heavy rainfall, the carrying capacity of the pipes had been insufficient and caused more flash floods in the city. However, he stressed that new drainage pipes in KKC would only mitigate flash floods in the city and not reduce the magnitude of flooding in Pra Lab.
Land and house elevation: Officials from both KKCM and PLM stressed that the water runoff regulations for land and house elevation, as defined in the Building Control Act 8, have and are not properly implemented in PUKKC. The enforcement of the regulations, as reported by a PLM official, is poorly monitored because of the local government's financial and human resources constraints.
Flood protection infrastructure: The RID stated PUKKC has three major kinds of flood protection infrastructure: a floodwall along the rivers, water pumps along Chi River and a recently established watergate with pumps downstream of Pra Keu stream. According to the RID, the capacity of the infrastructure may not be sufficient to address severe floods but building a watergate upstream of Pra Keu stream, for example, as PLM and other municipalities have demanded, would be too expensive and merely move the flooding to another area during heavy rainfall. An official from CRBO also highlighted that efficient water governance is problematic in PUKKC due to its limited decision-making power and conflicting interests of responsible governmental agencies.
Wastewater treatment: A KKCM official explained that there is one wastewater treatment plant in KKC, which only services 80 percent of the municipality. Most untreated wastewater from PUKKC, as an official from the REO10 stressed, is directly discharged into Pra Keu stream causing high levels of pollution. The official further stated that according to water quality standards of the National Pollution Control Department, the stream's water quality is not suitable for consumption or agriculture; Pra Lab community, however, indicate using the stream water for major farming activities.

Discussion and Conclusions
We provide an assessment of the livelihood vulnerability of Pra Lab communities to flood presented through a LVI and LVI-IPCC, as well as a list of key infrastructure problems of unplanned urbanization in PUKKC. The approach of constructing vulnerability indices may not be applicable for other areas and households because we used indicators that were developed and based on data for the specific local context of the study. We believe that this approach is an attempt to illustrate the reality of Pra Lab as livelihood vulnerability is dynamic and difficult to represent in one index. Despite that, we chose this analysis because we can focus on various dimensions of livelihood. Household vulnerabilities to flood are not included in public flood statistics, which usually only record losses at the macroeconomic level [49]. Thus, our indices can be used as assessment tools for policy formulation and public communication.
Our LVI indicates that Pra Lab communities are only moderately vulnerable to flood while their physical and financial vulnerability are highest. These weaknesses are illustrated by long floodwater retention in houses and on farmland, inaccessibility of streets during flood, lack of wastewater treatment system, high debts, low or no income and insufficient government compensation. We believe that if livelihood vulnerabilities in Pra Lab continue to increase, new urban poverty may emerge. Our results confirm a link between Pra Lab's reliance on an agricultural livelihood and their high financial instability. Hence, we claim that more alternative income generation through nonfarm jobs will be decisive in reducing their livelihood vulnerability to flood. Even though most household head's in Pra Lab may be not skilled for nonfarm work, the global trend of younger generations exiting agriculture could be supportive for a shift from rural to urban livelihood in Pra Lab. We suggest that urbanization can increase Pra Lab's adaptive capacity by providing more secure employment opportunities in the urban center, which outweighs the vulnerabilities unique to urbanization.
Our analysis shows that Pra Lab's livelihoods are closely intertwined with urbanization patterns and climate variation. We found that key infrastructure problems of urbanization in PUKKC contribute to flood risks in Pra Lab and, hence, impact multiple dimensions of livelihood vulnerability in Pra Lab. We assert that mainstreaming urban planning measures such as a climate-sensitive land use plan into flood management policies could mitigate flood risks and livelihood vulnerability in Pra Lab. However, our findings also stress that the development and implementation of these measures have shortcomings. For example, the new land use plan constrains certain infrastructure development in floodplain areas like Pra Lab but still favors further reduction of pervious area in KKC. This means that despite a new plan, the rainwater runoff from the city, in combination with anticipated stronger rainfall, is more likely to increase than decrease. Thailand's highly centralized administrative system [50,51], with its slow and redundant bureaucracy or overlapping responsibilities, further hampers policy-makers in adopting relevant flood reducing urban planning measures. In conclusion, we suggest that governmental flood management agencies reconsider building more conventional flood protection measures, such as watergates and floodwalls. Instead, we recommend increasing pervious surfaces that would slow down rainwater runoff through mainstreaming non-structural measures such as a risk-sensitive land use plan into flood management.
Author Contributions: Astrud Lea Beringer and Jutamas Kaewsuk conceived and designed the assessment approach; Astrud Lea Beringer and Jutamas Kaewsuk performed the assessment; Astrud Lea Beringer analyzed the data; Astrud Lea Beringer wrote the paper.
Acknowledgments: This research was conducted through the Urban Climate Resilience in Southeast Asia (UCRSEA) Partnership, supported by a five-year International Partnerships for Sustainable Societies (IpaSS) grant and funded by both the International Development Research Centre (IDRC) and the Social Sciences and Humanities Research Council of Canada (SSHRC). We thank the Thailand Environment Institute (TEI) in Nonthaburi, Thailand and in particular Dr Pakamas Thinphanga for coordinative assistance. We also thank our mentor Nim Lee for providing substantial revisions of the paper.

Conflicts of Interest:
The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript and in the decision to publish the results. Is anyone in your family chronically ill or gets sick very often? Adapted from [43,52].

H1.2
HH with family member ill due to floods (%) Has anyone in your family gotten chronically ill or gotten sick very often due to floods?

H1.3
HH with family members with diarrhea, dengue incident, pneumonia, or skin infection (during/after flood) (%) Has anyone in your family suffered from diarrhea, dengue, pneumonia, or skin infection during or after a severe flood?
Developed for the purposes of this questionnaire.

H1.4
HH with no medical insurance to cover health services and treatment expenses (during or after flood) (%) Do you have medical insurance to cover health service and treatment expenses during and after flood?
Developed for the purposes of this questionnaire.