Fast-drying dead fuels, generally characterized by a high surface area-to-volume ratio. They have diameters 1/4 inch or less. These fuels (grass, leaves, needles, etc.) Ignite readily and are consumed rapidly by fire when dry.
Vegetative fuels of small size such as grass, pine needles and leaves.
Fuels that ignite readily and are consumed rapidly by fire (e.g., cured grass, fallen leaves, needles, small twigs less than 1/4 inch diameter, also referred to as 1-hour fuels).
ignite readily and cause rapid fire spread (dry grass, dead leaves and tree needles, twigs and small trees).
Small needles, sticks, branches of trees (generally less than 3 inches in diameter).
Fast-drying fuels, generally with a comparatively high surface area-to-volume ratio, which are less than 1/4-inch in diameter and have a timelag of one hour or less. These fuels readily ignite and are rapidly consumed by fire when dry.
Fast-drying, dead fuels which have a Timelag constant of 1 hour or less. These fuels ignite readily and are consumed rapidly when dry. Included are grass, leaves, draped pine needles, and small twigs.
