

Surveying - Engineering
Q1: A sewer is laid from a manhole A to a manhole B, 250 m away along a gradient of 1 in 125. If the reduced level of the invert at A is 205.75 m and the height of the boning rod is 3 m, the reduced level of the sight rail at B, isA
208.75 m
B
202.75 m
C
206.75 m
D
211.75 m
ANS:C - 206.75 m Invert is the lowest point of sewer and crown is the highest point, therefore, 205.75-2=203.75 is the invert of sewer B. Boning rod is T shaped rod with a vertical portion at invert and a horizontal portion at the crown. So when the boning rod reading is 3 it gives the crown reading of sewer B. |


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