Urban infrastructures are critical, highly interconnected, and interdependent systems of services that physically tie metropolitan areas, communities, and neighbourhoods together. When such highly inter-related systems are affected by a disaster, cascading effects may result in the failure of infrastructure systems. This paper presents a method to unravel the complexity of cascading effects, which can be applied in situations where documented information of the hazardous event is limited. A service chain management framework is used to examine how services for water supply, sanitation, electricity and solid waste interact. The analysis provides a breakdown of the primary service system into a chain and service elements, which characterises the inter-relatedness of these services. We study the case of Barangay Catmon (neighbourhood) in Malabon, a densely developed urban area, located on Manila Bay that is exposed to various natural hazards. Many of Malabon's low-income households reside in informal settlements that are prone to flooding from the combined effects of land subsidence, pluvial flooding from the river network and storm surges. Our empirical study reveals the temporal spread of a typhoon's cascading effects on essential services and the subsequent impact on informal settlers, that may potentially counteract their hope for sustainable improvement through the upgrading of their settlement. Therefore, to complement the ongoing efforts of disaster risk reduction, service chain management framework may further guide the local authorities and other stakeholders to understand the characteristics of cascading effects varying with time and nature of the impact.

城市基础设施是关键的，高度相互联系的，相互依存的服务系统，它们将大都市地区，社区和社区实际联系在一起。当这种高度相互关联的系统受灾难影响时，级联效应可能会导致基础结构系统故障。本文提出了一种解开级联效应的复杂性的方法，该方法可用于危险事件的书面信息有限的情况。服务链管理框架用于检查供水，卫生，电力和固体废物服务之间的相互作用。该分析将主要服务系统细分为链和服务元素，这些特征表征了这些服务的相互关联性。我们研究了马拉邦的Barangay Catmon（社区）案例，位于马尼拉湾的人口稠密的市区，面临各种自然灾害。马拉邦的许多低收入家庭居住在非正式定居点中，这些人容易因土地沉降，河网的洪水和风暴潮等综合影响而泛滥成灾。我们的实证研究表明，台风对基本服务的连锁效应随时间的流逝以及对非正式定居者的后续影响，可能会通过提高定居点来抵消他们对可持续发展的希望。因此，为补充正在进行的减少灾害风险的努力，服务链管理框架可以进一步指导地方当局和其他利益相关者了解级联效应的特征，其级联效应随时间和性质的不同而变化。