The phreatic line (seepage line) in an earth dam is a:
Choose the correct answer
Straight line from upstream to downstream
Parabolic seepage surface within the dam body (Kozeny parabola)
Horizontal line at the base
Vertical seepage surface
Correct Answer
B. Parabolic seepage surface within the dam body (Kozeny parabola)
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The phreatic line (free surface of seepage) in an earth dam approximately follows a Kozeny base parabola with vertex at the downstream face. Casagrande modified this for sloping faces. The line is plotted using graphical methods for toe protection design.
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