Section 4: Soil and Water Conservation Engineering
Surveying and Levelling
Subtopic: Instruments for surveying and levelling
Question Statement:
To measure the difference in level precisely between two points with a levelling instrument having collimation error, the method to be used is
Options:
(A) reciprocal leveling
(B) check leveling
(C) compound leveling
(D) profile leveling
Official Answer Key:
A
Step-by-Step Solution & Explanation
Reciprocal levelling takes readings with the instrument set up near each of the two points alternately (equal backsight/foresight distances from each station overall); collimation (line-of-sight) error, curvature and refraction errors affect both sets of readings equally and cancel out when the two apparent differences are averaged.
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