For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of
A. 100 cm
B. 120 cm
C. 140 cm
D. 160 cm
Answer: Option D
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In the first method a line parallel to the sewer centre line is marked on the ground. This line is known as offset line and it is usually marked at a distance of 2 to 3 m or half the trench width +0.6 m from the centre line of the sewer. Along the offset line pegs are driven at an interval of 7.5 to 15 m.
thank you anju
Offset=b/2 + O. 6