Which one of the following scales is used to plot contour map?

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Question

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JKSSB JE CE 2021 Official Paper Shift 2 (Held on 28 Oct 2021)

Answer 1

Concept:

Contour Map:

From a contour map, the nature of the ground surface of an area can be known. So for identifying a suitable site for a dam or reservoir and for marking the tentative alignment of engineering projects involving roads, railways, etc. a contour map is essential.
The horizontal scale is used to plot a contour map.

Contouring:

Contours are the most accurate method of representing relief features.
Contouring is the act of using contour lines when representing the relief of an area on the map.
Contour lines are the lines drawn on the map connecting all points on the earth’s surface with equal elevations above a fixed datum line (usually the mean sea level).
- They are numbered in either feet or meters, above sea level. Usually, these numbers represent the exact elevation of land above sea level for all points along that line.
- Contour lines never cross or intersect each other.
- The spacing or gap between the contour lines represents the degree of slope.
- Contour lines lie perpendicular to streams and rivers.

Some of the salient uses of contours are described below

1. Nature of Ground

2. To Locate Route

3. Intervisibility between Stations

4. To Determine Catchment Area or Drainage Area

5. Storage capacity of a Reservoir