71. Discrete or granular particles change their
72. The suitable cross-section of sewers to carry combined flow, is
73. Facultative bacteria survive in
74. A nuisance is experienced in diluting water if dilution factor is less than
75. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
76. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is
77. The drop man holes are generally provided in sewers for
78. The flow velocity in detritus tanks is
79. In normal conditions, the period for sludge digestion, is
80. The first stage of neutral process of sludge digestion, is
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