Lesson · Built Environment & Infrastructure Vulnerability

Lifeline Dependencies and Cascading Failure

How power, water, telecoms, and transport depend on one another, why the second-order failure often exceeds the first, and how to map the dependencies that matter locally.

  • Professional
  • Teacher
  • Institution
  • Responder

Learning objectives

  • Map the dependency chain from electrical power to water, telecoms, and health services.
  • Explain why restoration sequence determines how long a community is without services.
  • Identify the single points of failure that carry disproportionate local consequence.
  • Describe how fuel supply constrains the duration of backup power.

In the field

Ordered, and meant to be workable under pressure. Numbered because the sequence matters.

  1. List the services your household or institution depends on, then list what each of those depends on.
  2. Identify which of them stop working within hours of a power outage.
  3. Establish how long any backup generator can run on fuel actually held on site.
  4. Arrange one communication method that does not depend on the local mobile network.
  5. Store water independently of the pumped supply, sized to the outage you consider plausible.

Sources · 3

The tag under each source states what was actually checked. “Authority named · URL not re-resolved” means the issuing body and document are named, but the link was not re-resolved for this lesson. It is not a claim of verification, and the authority’s own current bulletin always supersedes anything here.