Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Both (A) and (B)
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
Neither (A) nor (B)
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

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Waste Water Engineering
Traps

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

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