Waste Water Engineering
The non-clog pump which permits solid matter to pass out with the liquid sewage, is

None of these
Centrifugal pump
Pneumatic ejector
Reciprocating pump

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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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