benchmark reduced level= 1267.841 m

staff reading at benchmark=0.310 m

staff reading at 3 ground levels X,Y and Z: X=1.327 m, Y=1.214 m and Z=1.607m

invert level at X=1265.248 m . the gradient from X to Y is 1 in 80 for a distance of 40 m and the gradient from Y to Z is 1 in 100 for a distance of 60 m. the boning rod is 3 m.

a. what was the depth of each manhole?

b. what was the height of the sight rails above the ground at X, Y and Z?

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