Definition
Elevation from Contours
Slope from Contours
Eleven (11) characteristics of contour lines
Contour Line Characteristics-cont.
A contour line is a line
that passes through
points having the same elevation.*
Elevation from Contours
Elevations of points between
contours can be determined by interpolation.
Slope from Contours
The percent slope can also be
determined from the contour lines on a topo map.
Determine
the slope between the two points on the map.
Rise = 200 - 150 = 50 ft
Run = 2.625 in x 1,000 ft/in
Eleven (11) characteristics of contour lines
1.Contour lines are continuous.
2.Contour
lines are relatively parallel unless one of two conditions exists.
3.A
series of V-shape indicates a valley and the V’s point to higher elevation.
4.A
series U shape indicates a ridge. The U
shapes will point to lower elevation.
5.Evenly
spaced lines indicate an area of uniform slope.
Contour Line
Characteristics-cont.
6.A
series of closed contours with increasing elevation indicates a hill and a
series of closed contours with decreasing elevation indicates a depression.
7.Closed
contours may be identified with a +, hill, or -, depression.
8.Closed
contours may include hachure marks. Hachures are
short lines perpendicular to the contour line.
They point to lower elevation.
Contour Line Characteristics-cont.
9.The
distance between contour lines indicates the steepness of the slope. The greater the distance between two contours
the less the slope. The opposite is also
true.
10.Contours are perpendicular to the maximum slope.
11.A different type of line should be used for
contours of major elevations. For
example at 100, 50 and 10 foot intervals.
Common practice is to identify the major elevations lines, or every
fifth line, with a bolder, wider, line.
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