Which scenario best illustrates a bottom-up tsunami evacuation planning approach?

• A. National hazard maps and sirens.
• B. Community drills, local knowledge, and evacuation routes.
• C. Only relying on automated alarms.
• D. Ignoring local conditions.

Answer: (B)

Bottom-up evacuation planning focuses on how local people, their knowledge, and daily practices shape how a tsunami response works on the ground. This scenario shows that: communities practice drills, rely on local understanding of routes and safe spots, and have evacuation paths that residents know and can follow in a hurry. When people are involved in planning and rehearsing, they’re more likely to react quickly, understand the specific terrain and hazards of their area, and navigate bottlenecks effectively. Local knowledge matters for things like which roads stay passable, where to shelter, and how to help neighbors who may have mobility challenges.

National hazard maps and sirens illustrate a more centralized approach, which can miss local nuances and rely on devices or broad instructions that may not fit every neighborhood. Relying only on automated alarms can fail if the systems are unreachable or ignored, and ignoring local conditions can lead to instructions that don’t reflect real street networks, accessibility, or cultural and language differences. The bottom-up approach integrates this local insight with higher-level information, making evacuation more practical and trustworthy for the people who must act.