![]() The only difference is that the hachure marks on the contour lines indicate that you should count down in elevation, not up, as you move towards the center of the hachured contour circles. The contour interval for the map is still obeyed when contouring a depression. Contour lines with small perpendicular lines (called hachure marks) are used for such depressions on a topographic map. However, sometimes there are circular depressions (for example, a sinkhole) found on the Earth’s surface and these depressions may appear as hilltops on a topographic map unless a new convention is used. You have also learned that enclosed (circular) contour lines indicate a hill or mountain. You have learned that the spacing between contour lines indicates the slope of the Earth’s surface and that the shape of the contour line as it crosses flowing water can indicate the slope direction. The hill in the above diagram has a slightly steeper side on which side of the hill, the west or east side? These two contour lines are 2 miles apart.ĩ. Calculate the gradient of the stream between the highest and lowest contour lines that you can see crossing the stream. Calculate the relief of this map (Hint: Review the “Contour Lines” section in this chapter for assistance calculating relief).Ĩ. What is the elevation of the highest contour on this portion of the map?ħ. Which way is the stream flowing, to the North to the South?Ħ. Assume the contour interval for this map is 5ft, and the index contour that is crossing the stream has an elevation of 70ft.ĥ. \)įor Questions 5 through 9, refer to Figure 3.4 below, which shows a hill, an intermittent stream, and two index contours (darkened contour lines).
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