51. If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula $${\text{V}} = \frac{1}{{\text{n}}}{{\text{r}}^{\frac{2}{3}}}{{\text{s}}^{\frac{1}{2}}}$$ evolved by
52. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is
53. Maximum permissible velocity 1.5 m/sec, is adopted in drains
54. Aerobic bacterias
55. The quantity of liquid waste which flows in sewers during the period of rainfall, is known
56. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
57. Which one of the following gases is most significant as air pollutant?
58. The standard B.O.D. of water is taken for
59. Dried sewage after treatment is used as
60. The sewer which transports the sewage to the point of treatment, is called
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