31. The main disadvantage of oxidation pond is that
32. The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
33. Settling velocity increases with
34. Turbidity is measured on
35. The maximum discharge of a tube well is about
36. When there is no recirculation of sewage, then recirculation factor is
37. On standard silica scale, the turbidity in drinking water should be limited to
38. The most commonly used sewer under culverts is
39. Ground water is usually free from
40. The layout of distribution system in which water flows towards the outer periphery is
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