In sewers the highest non-scouring velocity is achieved in
A. Glazed bricks sewers
B. Cast iron sewers
C. Cement concrete sewers
D. Stone ware sewers
Answer: Option A
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Vitrified Tiles and Glazed Bricks => 4.5 to 5.5 m/sec.
Cast - Iron sewer => 3.5 to 4.5 m/sec.
Stoneware Sewer => 3 to 4 m/sec.
Cement Concrete Sewer => 2.5 to 3 m/sec.
Ordinary Brick Line Sewer => 1.5 to 2.5 m/sec.
Earthen Sewer => 0.6 to 1.2 m/sec..