Civil Engineering MCQJE Level Civil Engineering
The combined correction for curvature and refraction in levelling for a distance D (km) is:
SurveyingSurveyingMEDIUM
Choose the correct answer
A
C = 0.0785 D²
B
C = 0.0673 D² metres (D in km)
C
C = 0.0112 D²
D
C = 0.1 D²
Correct Answer
B. C = 0.0673 D² metres (D in km)
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Curvature correction = 0.0785 D² (m). Refraction correction = 0.0112 D² (m, reduces error). Combined correction C = 0.0673 D² metres where D in km. Curvature makes RL appear higher; refraction reduces this error (ray bends toward earth). Always SUBTRACTED from staff reading.
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