Sri Lanka has experienced severe consequences of flood disasters in recent decades. Hundreds of thousands of people and their homes were affected by mass floods in 2016 and 2017. However, the quantification of social vulnerability to such calamities has not been examined, although this is critical to achieve more efficient response and recovery. In this context, we shed light on an influential mechanism in order to measure social vulnerability to flooding in both rural and urban areas. We developed the multi-facet composite social vulnerability index (MFCSVI) by considering 31 robust variables drawn from five main components including socio-demographic, physical, financial, health, and social networks, as well as related social capital factors. We investigated 21 local administrative units by covering 405 affected households through a household survey. The results demonstrate diverse situations of social vulnerability to flooding between and within regions. The households from Kuruwita are significantly less vulnerable compared to those from Elapatha and Colombo. Our research provides empirical insight for policy makers who are interested in gauging social vulnerability and planning efficient solutions for response and recovery. Especially, this study contributes to the existing body of vulnerability research by elaborating traditional measures of social vulnerability by applying highly detailed survey data and various weight schemes of influential factors for the vulnerability assessment. Also, regional disparity between rural and urban areas is obviously worth to note for Sri Lankan vulnerability assessment.

近几十年来，斯里兰卡遭受了洪水灾害的严重后果。在2016年和2017年，成千上万的人和他们的房屋受到大洪水的影响。但是，对于这种灾难的社会脆弱性的量化工作尚未进行检查，尽管这对于实现更有效的响应和恢复至关重要。在这种情况下，我们揭示了一种影响机制，以衡量社会对农村和城市地区洪水泛滥的脆弱性。通过考虑从五个主要组成部分（包括社会人口，自然，财务，健康和社会网络以及相关的社会资本因素）得出的31个健壮变量，我们开发了多方面综合社会脆弱性指数（MFCSVI）。我们通过家庭调查覆盖了405个受影响的家庭，调查了21个地方行政单位。结果表明，在地区之间和地区内部，社会易受洪灾影响的情况多种多样。与Elapatha和科伦坡的家庭相比，Kuruwita的家庭的脆弱性要小得多。我们的研究为有兴趣衡量社会脆弱性并规划有效解决方案以应对和恢复的决策者提供了经验性见解。尤其是，该研究通过应用高度详细的调查数据和各种影响因素的权重方案进行脆弱性评估，通过阐述传统的社会脆弱性度量标准，为现有的脆弱性研究做出了贡献。也，