Statement I): The invert of the lower (outgoing) larger size sewer is depressed suitable so as to match with the crowns of the upper (incoming) and the smaller size sewers.
Statement II): It ensures that the smaller sewer runs full by backwater effect from the larger sewer even if the larger sewer does not run full.
1
Both Statement I) and Statement II) are individually true and Statement II) is the correct explanation of Statement I)
2
Both Statement I) and Statement II) are individually true but Statement II) is not the correct explanation of Statement I)
3
Statement I) is true but Statement II) is false
4
Statement I) is false but Statement II) is true