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How is the grain size distribution of sand in rapid sand filter?

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How is the grain size distribution of sand in rapid sand filter?

(a) Stratified

(b) Unlayered

(c) Layered with heaviest grains at the top

(d) Layered with lightest grains at the top

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This is a very interesting question from Comparison Between Slow and Rapid Sand Filter topic in portion Filtration of Environmental Engineering

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Correct answer is (d) Layered with lightest grains at the top

Easiest explanation: The grain size distribution of sand in rapid sand filter is stratified with lightest grains at the top and heaviest grains at the bottom.

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