CONTOUR LINE AND METHODS OF CONTOURING IN SURVEYING
Contouring is an important aspect of surveying which basically involves the determination of the elevation of various points on the ground followed by fixing the points of the same horizontal positions in the contour map.
A contour may be defined as an imaginary line that passes through the points of equal elevation. It is a line in which the surface of the ground is intersected by a level surface.
A Contour line may be defined as an imaginary line passing through the points of equal devotion. A contour line may also be defined as the intersection of a level surface with the surface of the earth. When the contours are drawn underwater, they are termed as Submarine Contours, Fathoms or Bathymetric Curves. This is the best method of representation of features such as hills, depressions, underwater etc on a two dimensional paper.
Purposes of Contouring:
A contour map is very useful since it provide valuable information about the land. Contour survey is carried out at the starting of any engineering project such as a road, a railway, a canal, a dam, a building etc.
(a) For large scale maps of flat country, for building sites for detailed design work and for calculation of quantities of earth work: 0.2 to 0.5 m.
(b) For reservoirs and town planning schemes: 0.5 to 2 m.
(c) For location surveys: 2 to 3 m.
(d) For small scale maps of broken country and General topographical work : 3 m, 5 m, 10 m or 25 m……………..
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