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How to Find the Contour Interval on a Map?


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How to Find the Contour Interval on a Map?
  • Considering the above map for the calculation of intervals, the steps worried in contour interval computation.
  • Let’s anticipate two index contour lines, 7000 and 7100, and compute the interval between them.
  • The distinction between the two chosen index contour traces 7100 and 7000 is 7100 – 7000 = 100
  • Now remember the wide variety of non-index strains contour strains between 7000 and 7100 as 4.
  • The wide variety of strains received in the above step is four and introduced with 1.
  • Adding, 4 + 1 = 5
  • Now divide one hundred with the aid of 5, 100/5 = 20 units
What is Contour Interval?

A contour interval in surveying is the vertical distance or the distinction in the elevation between the two contour strains in a topographical map. Usually there are extraordinary contour intervals for the special maps. Considering the measurement of the location to be mapped, contour intervals are assumed. In each map, on the right-hand backside side, the contour interval is specified. When the contour interval is now not detailed in the map, it can be calculated as defined in the following sections. The frequently used contour interval is 20 ft for a 1:24,000 map scale.

Also Read: What Is a Concept Sketch

Uses Of Contour Interval In Surveying

The makes use of contour interval in surveying are as follows,
  • Interval is utilized when a giant area is to be mapped to a small piece of paper.
  • A greater interval is utilized for a large location and smaller intervals for a smaller area.
  • In a large map, index contour traces are plenty much less to keep the map and are easy to learn.
  • To locate the peak of the intermediate point, the interval is utilized.
  • Earthquake estimation for the dam, bridge, or avenue can be determined with the assist of contour intervals inside the map.
  • As intervals are for the computation of the vertical elevation of an area, a comparable way to compute the horizontal distance is termed Horizontal Equivalent.
  • The horizontal distance between two factors on two consecutive contour strains for a supplied slope is recognised as the horizontal equivalent.
Example Calculation of Contour Intervals

Taking the given maps, the steps wished in contour interval calculation are,

Let us take, 7100 and 7200 and discover the interval between them. Now the distinction between 7200 and 7100 is 7200 – 7100 = one hundred The wide variety of contour traces in-between 7200 and 7100 is four Adding 1 we get, four + 1 = 5. Now we want to divide one hundred by means of 5, 100/5 = 20 units.
The Contour Interval of the given map is 20 Units.

Also Read: Standard Height of Window from Floor Level

Rules of Contour Intervals
  • Every factor of a contour line has a comparable elevation.
  • Contour strains awesome uphill from downhill.
  • Contour strains by no means contact or go every different than at a cliff.
  • Every fifth contour line is darker in shade than different contour lines. This is an INDEX contour line.
  • Contour strains are nearer collectively in steep terrain and farther aside in flat areas.
What are Contour Lines and Topographic Maps?

Ever observed these squiggly traces all over your trekking map? Other than the apparent trails and rivers, these squiggly traces are contour lines. Put simply, contour traces mark factors of equal elevation on a map.

Contour traces are crucial to grasp the elevation profile of your terrain or a specific land formation. This facts can be beneficial when choosing a trekking route... or lifesaving in a determined survival situation. Beyond backpacking and hiking, endless different professions use them - land surveyors, foresters, engineers, miners, geologists, hunters, to title a few.

How To Read Contour Lines?

A rapid look at a topographic map will supply you a ordinary thought of the landscape. Is it flat or mountainous?
If every line represents an equal factor of elevation, then any alternate in elevation would lead to inconsistent line spacing, right? For example, various contour strains spaced shut collectively would point out steep terrain, whilst traces spaced a ways aside would point out a gentler slope.

Contour Lines in Detail

They have various facets in frequent regardless of the land. But their significance besides a formal rationalization or you may additionally now not respect them. Although some seem that evident.

Contour strains have the following prevalent characteristics:
  • Contour strains in no way pass every other, cut up or divide.
  • Nearly spaced contour traces characterize steeper slopes, whilst spaced a long way aside strains depict gentler declines and inclines.
  • They create upward developments in the shape of a V- or a U-shape at move crossings and facets of valleys.
Also Read: Uses of Mortar

What are the Factors Affecting contour intervals?

The contour interval relies upon upon the following factors.

1. Nature of floor surface:
  • Plain ground: The contour intervals are normally small & are parallel.
  • Steep slope: The contour intervals are commonly huge & are unequal
2. Scale of the map:

The contour spacing will be giant for a map having a small scale. For the large scale map, the contour intervals are made of much less spacing.

3. Purpose:

For the unique & precise survey work, the contour interval need to be smaller. For the difficult survey work such as place survey, discovering catchment area, discovering the ability of water bodies, etc. we want large contour intervals.