Three Risk Components

The relative risk assessment chart uses three risk components:

Each of these components is assessed independently. Then, the three outputs are evaluated in a final step that provides the relative risk for the fire. Each risk component is defined by three variables. One variable is located on the right and one on the left side of the box and the third variable is defined by three interior lines extending from top to bottom.


Values are those ecologic, social, and economic resources that could be lost or damaged because of a fire. Ecologic values consist of the following:

Social effects can include the following:

Economic values can include the following:


The hazard in wildland fire is composed of the following:


Probability refers to the likelihood of a fire becoming an active event with potential to adversely affect values.

Relative Risk Considerations