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# Unit 3: Topography & Fire Behavior

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Topography   ::   Canyons & Drainages   ::   Retarders   ::   Slopes   ::   Exercises

## Exercise 1

### Salmon River Fires

Using the following fire situation and the above topographic map, answer the questions below. Take plenty of time to think out the full implications of what you have learned.
SITUATION:
During the late afternoon of July 10, a series of lightning caused fires started in the area depicted by the map. Each fire will be identified by the section number in which the fire is located. General cover is big sagebrush with grass. A forecast received for this area indicates continued hot and dry weather: High temps in the low 90's, low temps in the 50's, relative humidity 20% during daytime, and aftenoon winds steady WSW 8 mph.

 Question Options 1. What is the direction of the wind in the bottom of Rocky Canyon in section 19 at 2400? 2. On which of these fires are fuels likely to be driest this evening? 14 26 30 3. On which of these fires would you expect the heaviest fuel loadings? 13 26 30 4. On which of these fires are fuels most likely to be fully cured? 13 23 26 5. Which fire will travel fastest upslope? 14 23 24 6. Which fire is likely to get larger in size before contained? 14 24 30 7. Which fire could be most influenced by thermal belt effects? 14 23 24 8. Which fire appears to require extra safety precautions to line workers? 19 24 26 9. On which of these fires might artificial barriers most likely be used for control lines? 14 25 26 10. Which fire appears to have the best access for 4x4 ground tankers? 14 24 26

## Exercise 2

### Calculating Slope Percent

Using the topographic map below, complete the following steps to determine slope percents between points given.

 Question 1. What is the contour interval? 2. What is the map scale (inches per mile)? 3. What is the elevation at point A? 4. What is the elevation at point B? 5. What is the elevation at point C? 6. What is the elevation at point D?
Copyright 2008, Michael Jenkins. Cite/attribute Resource . admin. (2005, October 25). Unit 3: Topography & Fire Behavior. Retrieved January 07, 2011, from Free Online Course Materials — USU OpenCourseWare Web site: http://ocw.usu.edu/Forest__Range__and_Wildlife_Sciences/Wildland_Fire_Management_and_Planning/Unit_3__Topography___Fire_Behavior_12.html. This work is licensed under a Creative Commons License