In this blog post, we will talk about the dumpy level survey.
The dumpy level survey is the most popular type of survey used to determine various levels on construction sites.
Table of Contents
Introduction:
The dumpy level is an optical type surveying instrument that is used to locate points in a horizontal plane. The elevation of different points on the horizontal surface is calculated by using the dumpy level.
Other names of dumpy levels are builder level, Y level, etc. It was invented by Willian Gravatt, in 1832.
The key components of the dumpy level instrument are shown in the above figure.
The main reason for utilizing the Dumpy level over other leveling instruments is its higher accuracy. A dumpy level is known for high precision values for most of the Tacheometric methods. The accuracy of a dumpy level can be within 1:4000 for every 100 meters.
Working Principle of Dumpy Level:
The working principle of the dumpy level is based on establishing the relation between two or more points on a horizontal surface by using an inbuilt telescope and a bubble level.
Advantages of Dumpy Level:
- Operation of the dumpy level is very easy.
- The cost of the dumpy level is very low compare to theodolite and total station.
- Very few adjustments are needed to set up the instrument.
- It gives very high optical power.
- It gives a very accurate level reading.
Disadvantages of Dumpy Level:
- It can not measure the vertical angles.
- Sometimes angular measurement is not that correct.
Read more articles:
You can read our exclusive article on theodolite survey as given below,