Estimating and Costing
The inspection pit or chamber is a manhole provided in a base drainage system

All of these
At every 30 m intervals
At every change of gradient
At every change of direction

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Estimating and Costing
In the mid-section formula

All of these
The mean depth is the average of depths of two consecutive sections
The volume of the earth work is calculated by multiplying the mid-section area by the distance between the two original sections
The area of mid-sections is calculated by using mean depth

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