NEPAL ENGINEERING SERVICES

Sunday, May 26, 2019

Reciprocal leveling: A Useful method For finding level difference

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Reciprocal leveling



Reciprocal leveling is used to find accurate relative elevations of two widely separated intervisible points.This procedure is used for either differential or trigonometric leveling when along sight across a wide river, ravine, or similar obstacle must be made. 
The errors may arise out of the curvature of the earth or intervening atmosphere (associated with variation in temperature and refraction) or instrument (due to error in collimation) or any combination of these.

Steps1. To find the difference in elevation between two points,  X and Y
2. A level is set up at L near X and readings (X1 and Y1) are observed with staff on both X and Y respectively.
3. The level is then set up near Y and staff readings (Y2 and X2 ) are taken respectively to the near and distant points. If the differences in the set of observations are not same, then the observations are fraught with errors.
4. The errors may arise out of the curvature of the earth or intervening atmosphere (associated with variation in temperature and refraction) or instrument (due to error in collimation) or any combination of these.
The format for reciprocal levelling is given below::

Reciprocal Levelling Format

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