## 2 Definition of Water Security
The definition of UN-Water [13] for water security is referred to as the capacity of the population to protect the appropriate amounts of water and water quality that are acceptable for livelihood, human safety, socioeconomic development, ensuring protection against water-related pollution and disasters, and preserving ecosystems. The Asian Development Bank (ADB) [14; 15; 16] defined that the reliable water availability and unpredictable water-related impacts on water quality and quantity allowed for production, livelihood, and health were combined with acceptable levels of risk to society. It was also comprehensively expressed as society's ability to ensure that adequate amounts of acceptable water are still available for livelihoods, human happiness, socioeconomic development, and to preserve ecosystems from water-causal diseases and disasters. The ADB [14; 15; 16] evaluated water security in Asia-Pacific countries in five areas and made policy proposals on how to improve measures. The first emphasizes the provision of basic services related to water and sanitation as household water security. The second emphasizes the economic efficiency of the entire economy, including agriculture, industry, and energy sectors, as economic water security. The third discusses a stable water supply, water pollution reduction, prevention and management of flood and drought damage, and the restoration of urban ecosystems as urban water security. Fourth, environmental water security is associated with guaranteeing river health, responding to hydrological changes, and establishing and operating environmental governance. Fifth, water-related disaster resilience strengthens the capacity to cope with flood and drought prevention, response, recovery policies, planning, and financing. [PERSON] et al. [1] defined water security as the ability to ensure water availability and accessibility in response to various crises, vulnerabilities, instability, and inequality policy issues faced by society and ecosystems due to the volatility of water quantity and quality or water-related disasters. This definition included ensuring access to water and sanitation in Sustainable Development Goal (SDG) No. 6, investigating vulnerability, instability, and inequality policy issues along with water, securing and providing adequate sanitation systems, and improving water quality and safety from water-related disasters. [PERSON] et al. [1] maintained that social adaptive capacity should be cultivated to enhance economic, social, environmental and ecosystem resilience in order to achieve and maintain water security. Based on the previous discussions, this study defines water security as the ability of countries or societies to provide clean water and adequate sanitation services to all members of society, ensure an economic value of water, protect human life and the environment from pollution and water-related disasters, and achieve water and ecosystem conservation and recovery based on desirable governance that includes appropriate institutions and sufficient financing capacity. This study aims to refine the concept and definition of water security and a water security assessment framework based on the review of previous works on water security.