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When the loss of the head exceeds the static head, the head becomes _____

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When the loss of the head exceeds the static head, the head becomes _____

(a) Positive

(b) Negative

(c) Constant

(d) Zero

The question was posed to me in quiz.

This key question is from Problems in Filter Operation in division Filtration of Environmental Engineering

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The correct answer is (b) Negative

The best explanation: The head becomes negative when the loss of the head through the bed depth exceeds the static head. The negative head is the fall of liquid level in the piezometric tube below the center line of under drainage system.

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