What is contour interval and Uses of contour maps in surveying

What is Contour Interval and Uses of Contour Maps in Surveying

Let’s explore a few frequently asked questions regarding the contour lines. What is contour interval and Uses of contour maps in surveying.

What is the Contour Interval

The Contour interval is the elevation of difference between the successive contour lines represented in the topographical map.

For Example

Suppose the contour map has the contour line of 80, 85, 90, 95, & so on,

Then the contour interval is  = [85 -80]

= Five units.

What is the factors that affect the selection of the contour intervals

The contour spacing is determined by the factors listed below.

Nature of the ground surface

Plain ground typically features small, parallel contour intervals.

Steep slopes usually have large, uneven contour intervals.

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Scale of Map

The map with the small scale will feature wide contour spacing, whereas the larger scale map will have contour intervals with the narrower spacing.

Purpose

In the order to conduct accurate and thorough surveying, it is necessary to use smaller contour intervals. Conversely, when performing rough survey work like location surveys, determining catchment areas, & assessing water body capacities, larger contour intervals are more suitable.

What is the uses of contour maps in the Surveying?

• A contour map displays the ground’s topography.
• It aids in choosing suitable sites for infrastructures like dams, bridges, pipelines, roads and etc.
• By utilizing a contour map, we can determine the area and volume of the specific location on the Earth.
• The map allows us to calculate the area and capacity of reservoirs or other bodies of the water.
• The contour gradient can be derived from the map.
• We can identify the difference in elevation between any 2 points.
• It assists in finding the most cost-effective route of communication between two places.
• It helps in determining the profile of the ground surface in any given direction.

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What is the different types of the contour lines?

There are three types of the contour lines on the map. They are

1 – Index lines

Index contour lines are depicted as bold and prominent lines on the maps, offering elevation information in relation to sea level. Typically, 1 index line is displayed following every five intermediate lines.

2 – Intermediate lines

The lines drawn between the 2 index lines are typically more common & thinner in comparison to the index lines themselves.

3 – Supplementary lines

These are dotted lines, indicating flatter terrain.

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