46. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120?, the depth of sewerage is

47. If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is

48. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

49. If the discharge of a sewer running half is 628 1.p.s., = 0.001, and n = 0.010, the diameter of the sewer, is

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