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flow rate applied to the filter in m /m • d if the sand is to be used in (a) a slow-sand filter of average porosity of 0.39 and (b) a rapid-sand filter of average porosity of 0.42. The temperature of the water to be filtered is 20°C. The head losses in the slow-sand and rapid-sand filters are 0.06 m and 0.71 m, respectively and the bed depths are 76 cm, respectively.

7.14 The sharp filter sand of sieve analysis of Problem 7.10 is used to construct (a) a slow-sand filter of average porosity of 0.39 operated at

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