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Assume that settlement commences at half the construction time for the embankment. Then time to reach U = 90 per cent= 12 —| = 9 months.

cvt 0.187x9 „„„„ = H2 = 93? = From Fig. 10.4 Uz= 16 per cent.

Try 450 mm (0.45 m) diameter drains in a triangular pattern. Select n= 10. Then

Select a grid spacing of 3 m. R = 0.525 x 3 = 1.575 m 1.575

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