Which of the following is NOT a foam application technique?

• A. Rain-down
• B. Roll-on
• C. Bank-down
• D. Flood-down

Answer: (D)

Foam application techniques are about how foam concentrate is placed on the fire or spills to create a stable foam blanket that cools and separates fuel from air. The methods used to achieve that blanket include rain-down, roll-on, and bank-down.

Rain-down involves letting the foam solution fall from above in a controlled pattern, covering a broad area quickly and building up foam over the surface. Roll-on means moving the foam across the surface so a continuous, uniform layer forms, which is effective on larger flat areas or along surfaces. Bank-down creates a foam barrier by laying foam along an edge or against a surface to contain and direct the foam, often protecting exposures or shaping the foam contact where needed.

Flood-down, on the other hand, is not a foam-specific application technique. It describes flooding an area with water (or a non-targeted, high-volume discharge) rather than intentionally forming and placing a foam blanket. Since it does not focus on distributing foam to achieve a foam blanket, it isn’t considered a foam application technique.