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Question

A levelling is a carried out to establish the Reduced Level (RL) of a point C with respect to Bench Mark (BM) at A. The staff reading taken are given below.

Staff station BS
(m)
IS
(m)
FS
(m)
RL
(m)
A 1.545 - 100.00
B -0.860 - -1.420
C - 0.835

If RL of A is 100.00 m, then RL of C is

A
102.105 m
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B
102.965 m
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C
100.84 m
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D
101.27 m
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Solution

The correct option is D 101.27 m
HI = RL + BS
and RL = HI - BS

Staff station BS
(m)
IS
(m)
FS
(m)
HI
(m)
RL
(m)
A 1.545 - 101.545 100
B -0.860 - -1.420 102.105 102.965
C - - 0.835 - 101.27

RL of C = 101.27 m

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