Civil Engineering ⇒ Topic : Contouring and its Characteristics
A contour is an imaginary line on the ground joining the points of equal elevation.
Characteristics of Contours
1. Two contours of different elevations do not cross each other except in the case of an over hanging cliff.
2. Contours of different elevations do not unite to form one contour except in the case of a vertical cliff.
3. Contours drawn closer depict a steep and if drawn far apart it represent a gentle slope.
4. Contours equally spaced depict a uniform slope.
5. A contour at any point is perpendicular to the line of the steepest slope at the point.
6. A contour must close itself or go out of the limit of the map.
7. A set of ring contours with higher values inside, depict a hill whereas a set of ring contours with lower values inside, depict a pond or a depression.
8. When contours cross a ridge or V-shaped valley these form sharp V-shaped across them.
9. The same contour must appear an both the sides of a ridge or a valley.
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