131. The main disadvantage of oxidation pond is that
132. The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
133. Settling velocity increases with
134. Turbidity is measured on
135. The maximum discharge of a tube well is about
136. When there is no recirculation of sewage, then recirculation factor is
137. On standard silica scale, the turbidity in drinking water should be limited to
138. The most commonly used sewer under culverts is
139. Ground water is usually free from
140. The layout of distribution system in which water flows towards the outer periphery is
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