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The cross-sectional area of the seepage channel, for unit thiclcness,
would vary from hd = xD to ge = (1 — n)D, and the mean area
would be the area, hdeg -h Z^, the area, hdeg, being equal to the differ-
ence between the areas of the elliptical quadrants, aed and agh. The
7C D^ A
area, hdeg = A ^ (m -\- x — m n), and r/^ = . Tlierefore.
4