It is important that you understand the implications

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spreading by spotting or crowning; and firewhirls and other fire-induced atmospheric disturbances are not occurring. It is important that you understand the implications of these assumptions. You know, of course, that fire does not occur in a continuous, uniform and constant environment. But predictions from the model can be used successfully
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in many situations. The closer actual conditions are to the model assumptions, the better the predictions will be. This is why human judgment is always used along with the model. Even though the model does not describe extreme fire behavior, you will see in later units that it can predict the potential for spotting and crowning. Now please do question 5 on page 17, then return to the text. You should have selected all of the choices, since all the statements apply. Now please turn to page 18. Figure 11 presents a diagram of fireline intensity to further clarify this term. Fireline intensity is the heat released in 1 second by a foot-wide slice of the flaming front. This represents the heat that would impact a firefighter just ahead of the front. Since it has a direct relationship to flame length, it can be related to the kind of control actions and size of fireline that must be planned for on the fire. The relationships between fireline intensity and flame length will be explained in more detail in latex units. Flame length is also an output of the mathematical fire model. It should not be confused with flame height. Figure 12 illustrates how each measurement is taken. Flames usually bend forward at the head of a fire, depending on wind slope factors. Researchers have determined that flame length is a better parameter for describing fire behavior than flame height. As mentioned earlier, fire behavior predictions are useful for planning fire control actions. Such planning includes the location of firelines, use of direct or indirect attack methods, the type of control forces which will be effective, and the standards for fireline construction. Certainly, good planning in each of these areas will make the suppression effort more safe and effective. On page 19, the second exercise is on wildfire and its environment. Please complete this exercise now; then return to the text. You should have checked your answers on page 22. These decisions and choices are representative of those that are made on most fires by knowledgeable and experienced fireman. This unit has introduced you to the many factors that influence the way a fire burns, how a fire can interact with its environment, and how fire behavior predictions can be made. The remaining units of the course will take you into much more detail. The diagram on page 20 is a training "road map" to achieving the skills necessary to meet the performance objectives of this course. Unit numbers refer to units of this course. With patience and diligence, you will meet those objectives. Finally, we would like to summarize this unit by using a page from a publication entitled The Fire Environment Concept . Please read this summary on page 21; then prepare yourself for the unit test that follows.
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