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tank. By varying the upflow velocity of the water in the washer, the sand particles introduced into the tank are separated by virtue of the difference of their settling velocities. The lighter ones are carried into the effluent while the heavier ones remain. The straight line in the figure represents the size distribution in the final filter sand when the p4 and fractions greater than p5 have been removed.

Example 7.1 If the effective size and uniformity coefficient of a proposed filter is to be 5(10 ) cm and 1.5, respectively, perform a sieve analysis to transform the run-of-bank sand of Figure 7.9 into a usable sand.

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