Civil Engineering MCQAE Level Civil Engineering
The combined correction for curvature and refraction in levelling over distance d km is approximately:
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Choose the correct answer
A
+0.0673 d^2 m
B
-0.0673 d^2 m
C
-0.0112 d^2 m
D
+0.0112 d^2 m
Correct Answer
B. -0.0673 d^2 m
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Curvature makes the staff reading too high and refraction partly offsets it; combined correction is about -0.0673 d^2 m.
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