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Dumpy Level - Levelling, Surveying and Levelling | Surveying and Levelling Notes- Agricultural Engg - Agricultural Engineering PDF Download

DUMPY LEVEL
It is simple compact and stable. The telescope is rigidly fixed to its support therefore cannot be rotated about its longitudinal axis. A long bubble tube is attached to the top of telescope. Dumpy literally means short and thick.
Dumpy Level - Levelling, Surveying and Levelling | Surveying and Levelling Notes- Agricultural Engg - Agricultural Engineering

Fig 9.1 Dumpy level

Dumpy Level - Levelling, Surveying and Levelling | Surveying and Levelling Notes- Agricultural Engg - Agricultural Engineering

Fig 9.2 Parts of Dumpy level

The different parts of levelling instrument are,

  • Telescope
  • Eye-piece
  • focussing knob
  • level tube
  • cross bubble
  • foot screws
  • levelling head
  • diaphragm
  • ray shade
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FAQs on Dumpy Level - Levelling, Surveying and Levelling - Surveying and Levelling Notes- Agricultural Engg - Agricultural Engineering

1. What is a dumpy level and how is it used in levelling?
Ans. A dumpy level is a surveying instrument used for measuring horizontal levels and determining differences in elevation. It consists of a telescope mounted on a tripod, with a spirit level to ensure accuracy. To use a dumpy level, it is set up at a known point and a staff is placed at the desired location. The instrument is then adjusted until the crosshairs in the telescope align with a reference point on the staff, allowing the surveyor to measure the difference in height.
2. What is levelling in surveying and why is it important in agricultural engineering?
Ans. Levelling in surveying refers to the process of determining the relative heights or elevations of different points on the ground. In agricultural engineering, levelling is crucial for various purposes. It helps in designing irrigation systems, ensuring proper drainage, and creating level fields for crop cultivation. Levelling also aids in calculating gradients for constructing roads, canals, and other agricultural infrastructure.
3. What are the different methods of levelling and which one is commonly used in agricultural engineering?
Ans. There are several methods of levelling, including the height of instrument method, the rise and fall method, and the trigonometric levelling method. In agricultural engineering, the rise and fall method is commonly used. This method involves taking readings at each point, recording the differences in height (rise or fall), and calculating the final elevations based on these readings. It is a simple and efficient method for levelling small to medium-sized areas.
4. Can a dumpy level be used for measuring long distances?
Ans. No, a dumpy level is not suitable for measuring long distances. It is primarily used for measuring differences in elevation over relatively short distances. For measuring long distances, surveyors typically use other instruments such as total stations, GPS receivers, or theodolites, which provide more accurate results and have a longer range.
5. How can levelling help in preventing waterlogging in agricultural fields?
Ans. Levelling plays a crucial role in preventing waterlogging in agricultural fields. By creating a proper slope and ensuring a consistent level, levelling allows water to drain efficiently from the fields. This prevents water from accumulating and stagnating, which can lead to waterlogging and adversely affect crop growth. Levelling also helps in designing effective drainage systems, channels, and outlets to remove excess water from the fields.
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