OBJECT AND USES OF LEVELLING

 The object is

(i) to find out the elevations of given points with respect to a datum

(ii) to establish the points of needed height below or above the datum line.

Uses of levelling are

(i) to find out or to set the plinth level of a building.

(ii) to decide or set the railway, road ,canal or sewage line alignment.

(iii) to determine or to set different levels of towers, dams etc.

(iv) to find out the capacity of a reservoir.