Estimating and Costing
The trap which is provided to disconnect the house drain from the street sewer is called

Intercepting trap
Interception manhole
All listed here
Master trap

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

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

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