KEY POINT
Know Incident and Community-specific factors that affect evacuation and SIP decisions
ICs must consider all these factors:
- Public preparedness. If the public is trained they will be able to execute an order.
- Chemical characteristics. The toxicity, reactivity and physical state of a hazardous material determines how dangerous it is to the population.
- Time of release. A release that occurs in a residential neighborhood at midmorning on a weekday may threaten far fewer people than one that occurs at midnight when most people are in their homes sleeping.
- Weather conditions. Rain can help “knock down” a plume while wind can disperse one.
- Population density. A evacuation can lead to gridlock in densely populated areas.
- Other considerations include: terrain; ingress/egress; routes of travel; topographical conditions; modes of transportation available; condition of people affected (ambulatory or non-ambulatory); and so on.