A contour line is a line attracted on a topographic map to suggest ground key or depression. A contour interval is the vertical street or distinction in elevation between contour lines. Index contours space bold or thicker lines that appear at every fifth contour line.

You are watching: Two contour lines that are close together show a steep slope.

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If the numbers associated with specific contour lines are increasing, the elevation of the terrain is likewise increasing. If the numbers linked with the contour lines space decreasing, there is a decrease in elevation. As a contour philosophies a stream, canyon, or drainage area, the edge lines turn upstream. They climate cross the stream and also turn ago along the opposite bank of the stream developing a "v". A rounded contour suggests a flatter or more comprehensive drainage or spur. Contour lines tend to enclose the smallest areas on ridge tops, i m sorry are frequently narrow or very minimal in spatial extent. Sharp contour points show pointed ridges.Example 1- In the graphic below, what is the upright distance between the contour lines?
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Pick two contour lines the are next to each other and find the distinction in associated numbers.40 feet - 20 feet = 20 feetThe edge lines in this figure are equally spaced. The even spacing indicates the hill has a uniform slope. From the edge map, a profile deserve to be attracted of the terrain.Example 2- draw a profile showing the elevations the the contours.Note: The intervals are increasing, therefore, the contours show a hill. The height is normally thought about to be located at half the interval distance.
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Widely separated edge lines indicate a gentle slope. Contour lines the are an extremely close together show a steep slope.
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The figure above illustrates various topographic features. (b) an alert how a hill saddle, a ridge, a stream, a steep area, and a level area are presented with edge lines.
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The figure over illustrates a depression and its representation using contour lines. Notice the mite marks pointing toward lower elevation.

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Figure One
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Figure Two

SLOPE PERCENT native TOPOGRAPHIC MAP

The horizontal distance in between points A and also B can be measured with a scaled ruler and also used to recognize the slope percent.slope percent = rise/run × 100Example 4- What is the steep percent in practice 2 above?slope percent = rise/run × 100.For this computation, the rise, or upright ground distance, and run, or horizontal soil distance, space needed.Step 1.Measure the horizontal map distance between points A and B to obtain the upright ground distance.The horizontal map distance steps 0.5 inches.Step 2.Use the suitable conversion aspect to convert the horizontal map distance to horizontal ground distance.0.5 in × 24,000 in/in = 12,000 inStep 3.The desired unit is feet. Set up the cancellation table so all systems will cancel, other than the desired unit, feet.

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Step 4.Use the steep percent equation and solve. The operation is 1000 feet and also the climb in key is 120 feet.slope percent = rise/run × 100slope percent = (120ft / 1000ft) × 100 = 12%Slope Worksheet- usage the details from the example over and complete the slope worksheet. Heat 1 starts through the contour interval, no the projection point.Slope Worksheet (to it is in completed)

LineInput
0PPProjection point______
1CON INTContour interval, ft______
2SLCMap Scale______
3CFConversion factor, ft/in______
4#INTVLS# of edge intervals______
5RISERise in elevation, ft______
6MDMap distance, in (between points)______
7HZGDHorizontal ground distance, ft______
Output
SLP%SLOPE%______

Slope Worksheet (completed)

LineInput
0PPProjection pointA-B
1CON INTContour interval, ft40
2SLCMap Scale1:24,000
3CFConversion factor, ft/in2,000
4#INTVLS# of contour intervals3
5RISERise in elevation, ft120
6MDMap distance, in (between points)0.5
7HZGDHorizontal ground distance, ft1,000
Output
SLP%SLOPE%12