Question

A backsight (BS) reading taken by a level instrument set at station A on a bench mark (RL = 210.852) is 2.325 m, and foresight (FS) at a station is measured as 1.835 m. What will be the reduced level (RL) of the station A?
1. 210.362 m
2. 211.654 m
3. 211.342 m
4. 210.842 m

Answer 1

Correct Answer - Option 3 : 211.342 m

Given:

Backsight (BS) reading on bench mark = 2.325 m

Reduced level (RL) of bench mark = 210.852 m

Foresight (FS) reading at a station = 1.835 m

Calculation:

Reduced level (RL) of station A = RL of bench mark + BS reading – FS reading

= 210.852 + 2.325 – 1.835

= 211.342 m