If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is
A. 99.345 m
B. 100.345 m
C. 100.655 m
D. 101.870 m
Answer: Option A
This Question Belongs to Civil Engineering >> Surveying
Using the Height of Instrument (H.I.) method:
R.L. of B.M. = 100.000 m
Back sight (B.S.) = 1.215 m
H.I. = 100.000 + 1.215 = 101.215
Foresight (F.S.) = 1.870 m
R.L. of forward station = H.I. - F.S.
=101.215-1.870=99.345m
In case force sight is not given, how to calculate RL of forward station?
RL + back side = Hi- foresight
100.00+1.215 =101.215-1.879 =99.345
explain