CLOSING ERROR
The
closing error is determined initially for the accuracy of the dumpy
level.
Observations of Levelling for Closing Error:-
|
STATION
|
B.
S.
|
F.
S.
|
I.S.
|
H.I.
|
R.L.
|
CHAINAGE
|
|
A
|
1.210
|
|
|
82.070
|
80.860
|
T.B.M
|
|
B
|
|
|
1.505
|
|
80.565
|
0m
|
|
C
|
|
|
1.110
|
|
80.960
|
30m
|
|
CP1
|
|
1.505
|
|
82.465
|
|
|
|
D
|
|
|
1.230
|
|
81.235
|
60m
|
|
E(LEVEL)
|
|
|
1.002
|
|
81.463
|
90m
|
|
|
||||||
|
E'(LEVEL)
|
1.125
|
|
|
82.588
|
81.463
|
|
|
D’
|
|
|
1.560
|
|
81.028
|
0m
|
|
C’
|
|
|
1.600
|
|
80.988
|
30m
|
|
CP1’
|
|
1.623
|
|
82.611
|
|
|
|
B’
|
|
|
1.675
|
|
80.936
|
60m
|
|
A’
|
|
|
1.755
|
|
80.856
|
90m
(AT
SAME TBM)
|
Closing error = (80.860 – 80.856) = 0.004m
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