Which statement about cascading risk in GIS risk assessment is most accurate?

• A. Cascading risk refers to a single hazard with no downstream effects.
• B. Cascading risk describes how an initial hazard can trigger downstream impacts across a network, such as flood affecting multiple facilities.
• C. Cascading risk is only about financial risk with no physical hazard.
• D. Cascading risk is unrelated to spatial networks.

Answer: (B)

Cascading risk in GIS risk assessment is about how a single hazard can propagate through a spatial network to cause multiple downstream impacts. In practice, a flood upstream, for example, can affect several facilities downstream along rivers, roads, and utility networks because those places are interconnected. GIS helps map these connections, quantify who is exposed, who is vulnerable, and how the effects travel through the network, so you can anticipate which facilities or communities might be affected as the hazard spreads. This is why describing an initial hazard that triggers downstream impacts across a network—such as a flood affecting multiple facilities—is the best representation. The other ideas miss the key point: cascading risk depends on network connections and spatial propagation, not on a standalone event, not solely financial risk, and not something unrelated to spatial networks.