EXAMIANS
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
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In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
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For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
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Primary treatment of sewage consists of removal of
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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
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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 Ps = 900/(t + 60) the maximum run off is
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In sewage, the solids in mg per litre is
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In sewers designed with self cleansing velocity,
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In very first stage of decomposition of the organic matter in sewage
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For detecting the nitrates in sewage, the colour may be developed by adding
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