EXAMIANS
The minimum diameter of a sewer is kept
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Self-cleansing velocity 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 having fully oxidised organic matter, the nitrogen exists in the form of
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The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
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The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
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In areas where rainy season is limited to a few months, the type of sewerage system recommended is
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For evaporation and measurement of settable solids, the apparatus used, is
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For design of sewers, percentage of sewage discharge is assumed
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The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
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