Waste Water Engineering
In case of Imhoff tanks,

The velocity of flow is restricted to 0.30 m/minute
Detention period is 2 hours
All of these
The shape is rectangular

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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
All listed here
Must be of adequate size to avoid over flow
Must flow under gravity ½ to ¾ full

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