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The minimum depth of sand of a rapid sand filter is given by __________

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The minimum depth of sand of a rapid sand filter is given by __________

(a) Stokes formula

(b) Clark’s formula

(c) Hudson formula

(d) Emden formula

The question was asked during an online interview.

The query is from Rapid Sand Filter in chapter Filtration of Environmental Engineering

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The correct answer is (c) Hudson formula

Explanation: The minimum depth of sand of a rapid sand filter is given by

Qd^3h/l=B*29323, Where Q=filtration rate, d = sand size, H = head loss, l=depth of sand bed, B=break through index.

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