Tree Work
Drop Zone Calculator
A piece falling from height does not always stop where it lands. Bounce, slide, and roll extend the danger zone. Enter the drop height, weight, and ground type for the estimated total drop zone.
Suggested drop zone radius (ft)
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- Bounce factor
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- Min clearance from targets (ft)
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- Notes
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FAQ
Why account for bounce? +
A heavy piece hitting hardpack or asphalt can bounce 10+ feet sideways. Most ground-strike injuries happen well outside the "obvious" landing zone.
Sloped ground? +
Pieces will roll — sometimes a long way. Plan drop zones that channel runaway pieces away from people and structures, or use a stop log/berm.
How big a safety margin? +
Add at least 10 ft to the calculated radius for ground crew clearance, and double it if there is wind or you are dropping unrigged.