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Reciprocal levelling is done to test a dumpy level, along a chain line, at a common interval of 25m, starting at 125 m. The following records have been observed with the instrument shifts at distances of 200 m and 300 m:   3.200, 2.135, 1.265, 0.535, 3.105, 2.450, 1.535, 1.185, 1.755, 1.215, 2.145, 3.015 m Calculate the reduced levels at all the points and check for mathematical errors, assuming RL = 97.535 m is the benchmark reading at the first station. Use   a)      the rise and fall method, and b)      the height of the collimation method.

Reciprocal levelling is done to test a dumpy level, along a chain line, at a common interval of 25m, starting at 125 m. The following records have been observed with the instrument shifts at distances of 200 m and 300 m:   3.200, 2.135, 1.265, 0.535, 3.105, 2.450, 1.535, 1.185, 1.755, 1.215, 2.145, 3.015 m Calculate the reduced levels at all the points and check for mathematical errors, assuming RL = 97.535 m is the benchmark reading at the first station. Use   a)      the rise and fall method, and b)      the height of the collimation method.

Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter15: Slope Stability
Section: Chapter Questions
Problem 15.27P
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Reciprocal levelling is done to test a dumpy level, along a chain line, at a common interval of 25m, starting at 125 m. The following records have been observed with the instrument shifts at distances of 200 m and 300 m:

 

3.200, 2.135, 1.265, 0.535, 3.105, 2.450, 1.535, 1.185, 1.755, 1.215, 2.145, 3.015 m

Calculate the reduced levels at all the points and check for mathematical errors, assuming RL = 97.535 m is the benchmark reading at the first station. Use

 

a)      the rise and fall method, and

b)      the height of the collimation method.

 
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