Estimating and Costing
The assumption on which the trapezoidal formula for volumes is based, is

The end sections are parallel planes
The mid-area of a pyramid is half the average area of the ends
All listed here
The volume of the Prismoidal is over-estimated and hence a Prismoidal correction is applied

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

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

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