61. The temperature affects the
62. The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula $${{\text{P}}_{\text{s}}} = \frac{{900}}{{{\text{t}} + 60}}$$ the maximum run off is
63. The sewage treatment in septic tanks is due to
64. Which one of the following statements regarding septic tanks is wrong?
65. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of
66. The asbestos cement sewers are
67. If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is
68. D is the diameter of a circular sewer and $$\alpha $$ is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is
69. For design of sewers, percentage of sewage discharge is assumed
70. Nitrogen cycle of sewage, is
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