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I want to know how to determine water table height and phreatic line in earthen dam with rock fill and clay core.

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    $\begingroup$ Okay those are actually functions of each other, you need to know the water table levels to determine the calculated phreatic line, and to some extent the phreatic line, as controlled by dam geometry, determines the calculated water levels of the dam. Calculated values often fail to conform to on the ground realities as well. Really need something on the dam geometry at a minimum to start putting together a good answer, also the surrounding substrate will be critically important to the models. $\endgroup$ – Ash May 23 '18 at 15:41
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Okay have a look at this article it may be some use, it's the Journal of GeoEngineering, Vol. 8, No. 1 April 2013 Pgs 27-32 so you may be able to get a hard copy if the link fails, it talks about clay core dams and seepage calculations thereof, including phreatic pathway estimation.

If I remember correctly rock fill in earth dams is treated as earth for the purposes of working out seepage lines etc... as it is generally small enough (particle size), relative to the dam as a whole, to have little or no effect on total mean permeability.

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This problem can be solved using finite element modelling, e.g. using software such as SEEP/w. Here is a specific example of a dam: PDF and YouTube.

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