51. A rain sanitary sewer is constructed to carry
52. Primary treatment of sewage consists of removal of
53. For efficient working of a sewer, it must be ensured that
54. In olden days the type of section adopted in trunk and out fall sewers was
55. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known
56. Lead acetate test in sewer manhole is done to test the presence of
57. The sewers . . . . . . . .
58. The normal values of over flow rates for sedimentation tanks using coagulant, ranges between
59. The detention period for plain sedimentation water tanks, is usually
60. The minimum recommended diameter of sewers, is
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