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The isochrones represents ___________

(a) water levels in piezometric tubes at different time

(b) water levels in piezometric tubes at the same level

(c) water levels in piezometric tubes at different levels

(d) water levels in piezometric tubes at the same time

The question was posed to me in a national level competition.

My question is taken from Terzaghi’s Theory of One Dimensional Consolidation in division One Dimensional Consolidation of Geotechnical Engineering I

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Right option is (d) water levels in piezometric tubes at the same time

For explanation I would say: In general, the isochrone is the line on a diagram connecting points relating to the same time or equal times. So, in soil mechanics, the isochrones represent the water levels in piezometric tubes at the same time.

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