Waste Water Engineering
In sewers the velocity of flow should not be

More than 20 m/sec
More than the self-cleansing velocity
Less than 10 m/sec
Less than the self-cleansing velocity

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Waste Water Engineering
The sewers

Must be laid at least 2 to 3 m deep to collect /water from the basements
Must be of adequate size to avoid over flow
All listed here
Must flow under gravity ½ to ¾ full

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