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Errors in Chain Survey, Surveying and Levelling | Surveying and Levelling Notes- Agricultural Engg - Agricultural Engineering PDF Download

Chain survey is the simplest method of surveying. It is the exercise of physically measuring horizontal distances. In this method the lengths of lines marked on the field are measured, while the details are measured by offsets and ties from these lines. This field work will continue for 3 field hours. This is most suitable adapted to small plane areas with very few details.

Errors in chain survey
In general, the distance measurement obtained in the field will be in error.  Errors in the distance measurement can arise from a number of sources:

1. Instrument errors:

 A tape may be faulty due to a defect in its manufacturing or from kinking.

2. Natural errors.

            The actual horizontal distance between the ends of  the tape can vary due to the effects of

  • temperature,
  • elongation due to tension
  • sagging.

3. Personal errors.           

            Errors will arise from carelessness by the survey crew:

  1. poor alignment
  2. tape not horizontal
  3. improper plumbing
  4. faulty reading of the tape
The document Errors in Chain Survey, Surveying and Levelling | Surveying and Levelling Notes- Agricultural Engg - Agricultural Engineering is a part of the Agricultural Engineering Course Surveying and Levelling Notes- Agricultural Engg.
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FAQs on Errors in Chain Survey, Surveying and Levelling - Surveying and Levelling Notes- Agricultural Engg - Agricultural Engineering

1. What are some common errors that can occur in chain surveying?
Ans. Some common errors that can occur in chain surveying include incorrect chaining, misreading the chain, improper alignment, sagging or stretching of the chain, and errors in recording measurements.
2. How can incorrect chaining be prevented in chain surveying?
Ans. Incorrect chaining can be prevented by ensuring that the chain is properly stretched before taking measurements, using chaining pins to secure the chain, and regularly checking for any sagging or stretching during the survey.
3. What are the steps involved in conducting a chain survey?
Ans. The steps involved in conducting a chain survey include selecting suitable starting and ending points, setting up the chain, taking measurements using the chain, recording the measurements accurately, and calculating distances and angles.
4. What is the significance of levelling in agricultural engineering?
Ans. Levelling in agricultural engineering is significant as it helps in determining the slope, gradient, and contour of the land. This information is crucial in the design and implementation of irrigation systems, drainage systems, and land grading for optimal crop growth.
5. How can errors in levelling be minimized during agricultural engineering surveys?
Ans. Errors in levelling during agricultural engineering surveys can be minimized by using precise levelling instruments, ensuring proper calibration of the instruments, taking multiple readings at each point, and following a systematic levelling procedure. Additionally, regular maintenance and periodic checks of the instruments can help in reducing errors.
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