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. 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? 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. Widely separated edge lines indicate a gentle slope. Contour lines the are an extremely close together show a steep slope.  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. The figure over illustrates a depression and its representation using contour lines. Notice the mite marks pointing toward lower elevation.

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### 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. 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)

 Line Input 0 PP Projection point ______ 1 CON INT Contour interval, ft ______ 2 SLC Map Scale ______ 3 CF Conversion factor, ft/in ______ 4 #INTVLS # of edge intervals ______ 5 RISE Rise in elevation, ft ______ 6 MD Map distance, in (between points) ______ 7 HZGD Horizontal ground distance, ft ______ Output SLP% SLOPE% ______

Slope Worksheet (completed)

 Line Input 0 PP Projection point A-B 1 CON INT Contour interval, ft 40 2 SLC Map Scale 1:24,000 3 CF Conversion factor, ft/in 2,000 4 #INTVLS # of contour intervals 3 5 RISE Rise in elevation, ft 120 6 MD Map distance, in (between points) 0.5 7 HZGD Horizontal ground distance, ft 1,000 Output SLP% SLOPE% 12