What calculation represents the foam application rate?

The foam application rate is calculated based on the area of the surface that needs to be covered with foam for effective firefighting operations. The correct option expresses this by using the formula length multiplied by width to obtain the area, and then multiplying by a factor (in this case, 0.10 gpm) to represent the application rate.

This calculation is crucial for ensuring that there is enough foam being applied to suppress the fire adequately. The choice correctly focuses on the area rather than volume or depth, as the effectiveness of foam in suppressing flames relies greatly on covering the surface area involved in the fire. This understanding is rooted in fire protection principles where the foam needs to blanket the material on fire to act effectively.

Using this formula supports the intent of foam application through proper area coverage, which is essential in fire brigade operations focused on preventing fire spread and extinguishing flames efficiently. The specific rate indicated (0.10 gpm) serves as a guideline for the minimum foam flow needed per unit area, reinforcing safety and effectiveness in firefighting strategy.