Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 100 downward
1 in 503 upward
1 in 100 upward
1 in 500 upward

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Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

The men entering the manhole should be advised to smoke in the sewer
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
Proper tests for the presence of poisonous gases must be carried out
Warning signals should be erected

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Waste Water Engineering
Traps

Are water seals which prevent the entry of foul gases
Dissolve the foul gases
Create symphonic action to increase the quick disposal of sewerage
Are used to trap the rats entering sewers

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