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Civil Engineering Waste Water Engineering Difficulty: Medium

The factor responsible for purification of sewage in river is

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The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is The number of independent displacement components at each joint of a rigid-jointed space frame is Metal sleepers are superior to wooden sleepers with respect to 'H' is the flying height above mean ground level and 'f' is the principal distance of a vertical photograph. The mean scale of the photographs is A soil has a bulk density of 22 kN/m 3 and water content 10%. The dry density of soil is