Which one of the following statements is NOT correct ?

1.	Which one of the following statements is NOT correct ?
A.	In combined sewerage system, one set of sewers is laid for both sanitary sewage and storm water.
B.	In separate system, the design of sewage system is economical
C.	In separate system, self cleaning velocities are not available and occasional flushing is required.
D.	As the sewage is diluted by storm water in combined sewage system, cost of treatment is low.
Answer» D. As the sewage is diluted by storm water in combined sewage system, cost of treatment is low.

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Which one of the following statements is NOT correct ?

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