SAF Fire Management & Prescribed Burning 1 — Questions and Answers
Question 1: Which component of the fire environment triangle describes the arrangement, continuity, and moisture content of fuels?
- Topography
- Fuel (Correct answer)
- Weather
- Atmosphere
Correct answer: Fuel
The fuel component of the fire environment triangle encompasses fuel type, arrangement, moisture content, and continuity, all of which directly influence fire behavior.
Question 2: The term 'fine fuels' in fire management typically refers to fuels with a time-lag of:
- 1 hour (Correct answer)
- 10 hours
- 100 hours
- 1000 hours
Correct answer: 1 hour
Fine fuels (1-hour time-lag fuels) are small-diameter materials (less than 0.25 inches) that respond quickly to changes in atmospheric moisture and ignite most readily.
Question 3: A prescribed burn conducted under specific pre-defined conditions to meet resource management objectives is best described as:
- Wildfire suppression
- Prescribed fire (Correct answer)
- Slash burning
- Backfire
Correct answer: Prescribed fire
Prescribed fire is the deliberate application of fire under specified conditions within a defined area to achieve land management objectives, distinguished from unplanned wildfire.
Question 4: Which wind measurement is most critical when writing a prescribed burn prescription?
- Geostrophic wind speed
- 20-foot wind speed (Correct answer)
- Surface wind speed at 2 feet
- Jet stream velocity
Correct answer: 20-foot wind speed
The 20-foot wind speed (measured 20 feet above the vegetation) is the standard reference used in fire behavior modeling and prescribed burn prescriptions because it represents the wind driving fire spread.
Question 5: The National Fire Danger Rating System (NFDRS) uses which index to estimate the energy release from burning fuels?
- Keetch-Byram Drought Index (KBDI)
- Energy Release Component (ERC) (Correct answer)
- Haines Index
- Burning Index (BI)
Correct answer: Energy Release Component (ERC)
The Energy Release Component (ERC) represents the potential heat release per unit area in the flaming front, reflecting the dryness of both live and dead fuels.
Question 6: Which type of prescribed burn is ignited at the downwind end of a unit and allowed to back slowly into the wind?
- Head fire
- Flank fire
- Backing fire (Correct answer)
- Spot fire
Correct answer: Backing fire
A backing fire burns against the wind, moving slowly upwind with lower flame lengths and intensity, making it safer and easier to control than a head fire.
Question 7: The Keetch-Byram Drought Index (KBDI) measures:
- Relative humidity of the air
- Moisture deficit in deep duff and organic soils (Correct answer)
- Fuel moisture of 100-hour fuels
- Wind-driven fire spread potential
Correct answer: Moisture deficit in deep duff and organic soils
KBDI quantifies the soil and duff moisture deficit, ranging from 0 (saturation) to 800 (maximum drought), and is used to assess fire potential related to deep soil moisture conditions.
SAF Fire Management & Prescribed Burning 1
Which component of the fire environment triangle describes the arrangement, continuity, and moisture content of fuels?