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Sight rails are to be fixed at A and B 106.680m apart for the setting out of a sewer at an inclination of 1

Sight rails are to be fixed at A and B 106.680m apart for the setting out of a sewer at an inclination of 1 in 200 rising towards B. If levels of the surface are A 32.379m and B 31.839m, and the invert level at A is 30.706, at what height above ground should the sight rails be set for use with a traveler (Boning rod) of 3m long.

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