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Hazard Tree – No Work Zones

 

No work zone (NWZ) graphic showing a large circle shaded with a NWZ clear circle on right side within shaded area indicating the potentially dangerous tree or high-value wildfire area.

Knowing the exact time a given hazard tree (or compromised section) will fail is extremely difficult, and is, in many cases, an unpredictable task. Given this fact, we need to manage firefighters’ exposure to these hazards by creating a safe work area or No Work Zone (NWZ). The size and extent of the NWZ must be determined by onsite conditions, such as terrain, stand structure, and fire impacts on the tree and adjoining trees.

When an identified hazardous tree or trees cannot be felled, then perform an assessment of which areas have too high a risk, and post a lookout to warn the personnel to stay clear of these areas while working in adjacent areas. If hazard still exists before leaving the area, flag the NWZ so that personnel entering the area will be able to recognize the hazard. Use the following failure zone illustrations as examples to help manage firefighter exposure to these identified hazards. Also, remember to include the possibility of the Domino Effect to surrounding trees.
 

Figure 1 - 1 1/2 X Height of snag    Figure 2 - 1 1/2 X Trunk-to-branch-tip distance      Figure 3 - 1 1/2 X Length of dead top   
Figure 1 - graphic showing the potential failure zone of a dangerous area around a snag tree. Figure 2 - graphic of a tree showing the distance of dead limb hazard area. Figure 3 - graphic showing a pine tree with potential failure zone of the dead top.

         

         

 

Category
Felling Safety
References
Hazard Tree and Tree Felling Subcommittee

Last Modified / Reviewed:


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Questions?  Please contact:
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Air Operations Summary (ICS 220 WF)

National Interagency Aviation Committee

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Questions?  Please contact:
Fuels Management Committee

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References:

NWCG Firing Boss, Single Resource Position Page

NWCG Incident Position Standards for Firing Boss, Single Resource, PMS 350-105

NWCG Position Task Book for Firing Boss, Single Resource (FIRB), PMS 311-105

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Questions?  Please contact:
Interagency Helicopter Operations Subcommittee

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These resources, part of the Performance Support Package developed through the Incident Performance and Training Modernization (IPTM) effort, support trainees, qualified personnel, and evaluators.

Any changes to qualification pathways will take effect with the next update of the NWCG Standards for Wildland Fire Position Qualifications, PMS 310-1.

References:

NWCG Incident Position Standards for Helicopter Crewmember, PMS 350-22

NWCG Incident Position Standards for Helicopter Crewmember, PMS 350-22

NWCG Position Task Book for Helicopter Crewmember (HECM), PMS 311-22

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Questions?  Please contact:
Interagency Fire Unmanned Aircraft Systems Subcommittee

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References:

NWCG Standards for Fire Unmanned Aircraft Systems Operations, PMS 515

NWCG National Interagency Aviation Committee