61. In septic tanks, decomposition of organic bacteria, is done by
62. Pick up the correct statement from the following:
63. Pick up the incorrect statement from the following:
64. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
65. depends upon The Chezy’s constant C in the formula V = C
66. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
67. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is
68. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
69. The sewer pipes
70. The detention time (t) of a settling tank, may be defined as the time required for
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