Contour Interval

 What is Contour Interval?

A Contour Interval in surveying is the vertical distance or the distinction withinside the elevation among the 2 contour strains in a topographical map. Usually there are distinct contour durations for the distinct maps. Considering the dimensions of the location to be mapped, contour durations are assumed. In each map, at the right-hand backside side, the contour c program languageperiod is designated. When the contour c program languageperiod isn't always designated withinside the map, it may be calculated as defined withinside the following sections. The usually used contour c program languageperiod is 20 ft for a 1:24,000 map scale.

A contour c program languageperiod is a vertical distance or distinction in elevation among contour strains in a topographic map, index contour strains are formidable or thick strains that seem on each 5th contour line and if the wide variety related to a specific contour strains are increasing, elevation will increase withinside the location as well.

Uses Of Contour Maps

  • You can select a appropriate webweb page to your production activity.
  • You can decide the reservoir capacity.
  • Alignment of roads, canals and transmission strains is carried out effectively via contour strains.
  • The traits of the floor may be determined.
  • Earthwork extent estimation.
  • Ground traits (e.g. flatness, uniformity, sloping, undulations or hills, etc.)
  • Using the contour map, you could pick out the maximum appropriate and least expensive webweb page to your paintings, consisting of roads, railroads, canals, pipelines, dams, and reservoirs.
  • The quantity of reservoir garage water, cuts and embankments may be envisioned the usage of contour strains.
  • You can use contour strains to plot navy operations.
  • They are used to reap records used withinside the layout and production of irrigation systems consisting of dams.

Factors Affecting The Selection Of Interval

1. The Scale of The Map 

The contour is inversely proportional to the dimensions of the map. If the dimensions is small, the contour c program languageperiod have to be huge and vice versa.

2. Nature of The Ground

The standard terrain of the location determines the contour c program languageperiod. For a flat location, the contour c program languageperiod have to be small. For sloping or undulating terrain, the selected contour c program languageperiod have to be huge.

3. Purpose and Expansion of the survey paintings

If surveying paintings is for use for specific and designated calculations, then the small contour c program languageperiod have to be selected and a huge contour c program languageperiod is selected for the subsequent cases:

  • For catchment regions
  • To the reservoir
  • For region survey

4. Time to be had and Eligible Expenses for subject and workplace paintings

A huge contour c program languageperiod have to be used if the time to be had for survey paintings is less. The small contour survey paintings and plotting want to be greater specific. For a small contour c program languageperiod, the cash wanted can also be greater as the sphere and workplace paintings can be large.

How to Calculate Contour Interval from Maps?

A contour map includes contour strains of a given geographical region. To maintain the contour map easy and clean to study, now no longer each contour line is marked with its elevation reading. These marked or classified strains are recognised or termed as Index Contour Lines. Usually, the map legend identifies the contour spacing at the map, however on occasion best a part of the map is to be had. Knowing a way to calculate contour c program languageperiod will become a beneficial technique. On maximum maps, every 5th contour, marked with a thicker or darker line, is an index line or an index contour. This index line is marked highly. Find the elevation of the 2 adjoining index strains. The maximum wide variety represents an uphill ascent. Find the distinction among the 2 elevations.

Pros of Contour Interval:

  • Provides precious statistics: Contour c program languageperiod is an vital device for information the topography of an location. It enables to pick out the form and elevation of hills, valleys, ridges, and different functions.
  • Helps in selection making: Contour c program languageperiod affords important statistics to hikers, surveyors, geologists, and different specialists who want to make knowledgeable choices approximately the terrain.
  • Easy to interpret: Once you apprehend a way to study a contour map, it`s highly clean to interpret the statistics and visualize the topography.

Cons of Contour Interval:

  • Limited statistics: Contour c program languageperiod best affords statistics approximately the vertical elevation modifications in a specific location. It does now no longer display statistics approximately different functions consisting of vegetation, water sources, or man-made systems.
  • Scale limitations: Contour durations are depending on the dimensions of the map. A map with a huge scale won't display small contours or details, whilst a map with a small scale won't display large functions.
  • Complex terrain: Contour durations may be hard to interpret in complicated terrain with a couple of peaks, ridges, and valleys. It also can be hard to distinguish among intently spaced contour strains, specially in regions with a steep gradient.

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What is Contour Interval?

What is Contour Interval? A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map. Usually there are different contour intervals for the different maps. Considering the size of the area to be mapped, contour intervals are assumed. In every map, on the right-hand bottom side, the contour interval is specified. When the contour interval is not specified in the map, it can be calculated as explained in the following sections. The commonly used contour interval is 20 feet for a 1:24,000 map scale. Methods of Contour Interval There are one-of-a-kind techniques of figuring out contour c programming language on a map. Some of the not unusualplace techniques are: Direct size: This includes measuring the space among contour strains and dividing it through the range of contour periods among them. For example, if the space among  contour strains is 200 ft and there are 4 contour strains in among, then the
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