A contour heat is a line attracted on a topographic map to suggest ground elevation or depression. A contour interval is the vertical street or distinction in elevation between contour lines. Index contours are bold or thicker currently that appear at every 5th contour line.
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If the numbers linked with certain contour lines are increasing, the elevation of the terrain is additionally increasing. If the numbers associated with the edge lines are decreasing, there is a to decrease in elevation. As a contour viewpoints a stream, canyon, or drainage area, the edge lines revolve upstream. They then cross the stream and also turn ago along the opposite financial institution of the stream creating a "v". A rounded contour indicates a flatter or broader drainage or spur. Contour lines have tendency to enclose the smallest areas on ridge tops, i beg your pardon are regularly narrow or very restricted in spatial extent. Spicy contour points indicate pointed ridges.Example 1- In the graphics below, what is the vertical distance between the contour lines?
Pick 2 contour lines that are next to each other and also find the distinction in connected numbers.40 feet - 20 feet = 20 feetThe edge lines in this figure are equally spaced. The also spacing indicates the hill has actually a uniform slope. Native the edge map, a profile can be drawn of the terrain.Example 2
- draw a profile reflecting the elevations that the contours.Note: The intervals space increasing, therefore, the contours indicate a hill. The height is normally thought about to be located at fifty percent the expression distance.
Widely separated contour lines show a gentle slope. Contour lines that are very close together show a steep slope.
The figure above illustrates various topographic features. (b) notice how a hill saddle, a ridge, a stream, a steep area, and also a flat area are displayed with edge lines.
The figure over illustrates a depression and also its depiction using edge lines. Notification the mite marks pointing toward reduced elevation.
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SLOPE PERCENT from TOPOGRAPHIC MAP
The horizontal distance in between points A and also B have the right to be measured v a scaled ruler and also used to recognize the steep percent.slope percent = rise/run × 100Example 4- What is the steep percent in exercise 2 above?slope percent = rise/run × 100.For this computation, the rise, or vertical ground distance, and run, or horizontal ground distance, space needed.Step 1.Measure the horizontal map distance between points A and B to get the upright ground distance.The horizontal map distance steps 0.5 inches.Step 2.Use the ideal conversion element to convert the horizontal map distance to horizontal soil distance.0.5 in × 24,000 in/in = 12,000 inStep 3.The wanted unit is feet. Set up the cancellation table so all units will cancel, other than the desired unit, feet.
Step 4.Use the slope percent equation and also solve. The run 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 information from the example over and finish the slope worksheet. Line 1 starts v the contour interval, not the projection point.Slope Worksheet (to it is in completed)
|1||CON INT||Contour interval, ft||______|
|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||______|
Slope Worksheet (completed)
|1||CON INT||Contour interval, ft||40|
|3||CF||Conversion factor, ft/in||2,000|
|4||#INTVLS||# of edge intervals||3|
|5||RISE||Rise in elevation, ft||120|
|6||MD||Map distance, in (between points)||0.5|
|7||HZGD||Horizontal soil distance, ft||1,000|