Cross-Sectioning

In various engineering projects, not only longitudinal profile but also the profile of cross-sections at standard intervals is needed. These profiles help in calculating the earth works involved in the projects. Given figure shows the scheme of such work in which longitudinal profile is found by taking readings at 20 m interval along chain lines AB, BC and readings are taken at an interval of 3 m on either side. The distances on the cross-sections are treated as right or left of the lines as they are found whereas facing the forward station of survey. The cross-sectional length based upon the nature of the project.

Given table shows a page of level book needed for this type of levelling.

Table - A typical page book for cross-section levelling