Provide an example of a 'cascading risk' scenario in GIS risk assessment.

• A. A flood damages a warehouse, halting production, causing supply delays, impacting retailers, and triggering financial market reactions; spatially, initial hazard leads to downstream consequences along the network.
• B. A minor software bug causes a single desk error.
• C. A local power outage with no wider effects.
• D. A marketing campaign causing no risk.

Answer: (A)

Cascading risk in GIS risk assessment is about how a single hazard can trigger a chain of linked impacts across a network of assets and processes. GIS helps map the hazard, the exposed assets, and the connections between them, so you can see how disruption at one node can propagate through transport routes, suppliers, and downstream stakeholders over time and space.

In this flood example, water damages a warehouse, which is a node in the logistics network. That damage halts production, leading to delays in shipments, shortages at retailers, and ripple effects through suppliers and even financial markets as stakeholders react to the disruption. The key is that the initial hazard doesn’t stay local; the effects travel along the network, illustrating a cascading risk scenario that GIS can model and visualize.

The other scenarios describe isolated events with no propagation through a connected system, so they don’t demonstrate cascading risk in the GIS sense.