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This technical glossary defines several words and expressions used in forest fire protection and management. The definitions are from the Glossary of Forest Fire Management Terms published in 2003 by the Canadian Interagency Forest Fire Centre in Winnipeg.
For an english to french version of these words and expressions, click here
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Rappel Crew – An initial attack crew trained to descend from a specially equipped, hovering helicopter on a rope fitted with a mechanical device to control the rate of descent.
Rate of Area Growth – The speed at which a fire increases its size, expressed in terms of area per unit of time. Recommended SI unit is hectares per hour (ha/h). Note Rate of Perimeter Growth and Rate of Spread.
Rate of Perimeter Growth – The speed at which a fire increases its perimeter, expressed in terms of distance per unit of time. Recommended SI units are metres per minute (m/min) and kilometres per hour (km/h). Synonym - Rate of Perimeter Increase. Note Rate of Area Growth and Rate of Spread.
Rate of Spread (ROS) – The speed at which a fire extends its horizontal dimensions, expressed in terms of distance per unit of time. Generally thought of in terms of a fire's forward movement or head fire rate of spread, but also applicable to backfire and flank fire ROS. Recommended SI units are metres per minute (m/min) and kilometres per hour (km/h) (1.0 m/min is equivalent to 0.06 km/h)). Note Rate of Area Growth and Rate of Perimeter Growth.
Reburn – Subsequent burning of an area previously burned.
Relay Tank – A tank, usually collapsible, used as a reservoir in the relay of water from one fire pump to another.
Residence Time – The length of time required for the flaming zone or fire front of a spreading forest fire to pass a given point, most commonly expressed in minutes (min) and/or seconds (s). Numerically, it is equal to the flame depth divided by the rate of spread. Note Burn-out Time.
Resistance to Control – The relative ease of establishing and holding a fireguard and/or securing a control line as determined by the difficulty of control and resistance to fireguard construction.
Rich Tool – Note Tools, Hand, Fire.
Rotor Downwash – The air turbulence occurring under and around the main rotor system(s) of an operating rotary-wing aircraft.
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