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What kind of method was suggested by Casagrande, for determining the phreatic line?

(a) Experimental method

(b) Analytical method

(c) Graphical method

(d) All of the mentioned

The question was posed to me during a job interview.

This interesting question is from Seepage Analysis in section Seepage Analysis of Geotechnical Engineering I

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Right option is (c) Graphical method

For explanation: Graphical method was used by Casagrande for the determination of the phreatic line using flow net.

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