Estimating and Costing
In the mid-section formula

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
All of these
The area of mid-sections is calculated by using mean depth

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Estimating and Costing
Pick up the incorrect statement regarding a master trap from the following:

The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
The water seal is less than that of ordinary traps
It is provided a cleaning eye at the top of the trap
It is provided in between the lower end of the house drain and the street sewer

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