Estimating and Costing
The area of a sloping surface of a protective embankment of mean height‘d’, side slopes S: 1 and length ‘L’ is

√[d² × (ds)²]
2 L.D √(1 + s²)
d × d × s
L.D √(1 + s²)

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

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
The water seal is less than that of ordinary traps
The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe

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