Question: A protective three-layer filter is proposed between the foundation and rock drain located near the toe of a compacted earth-fill dam. Is this filter acceptable?

A protective three-layer filter is proposed between the foundation and rock drain located near the toe of a compacted earth-fill dam. Is this filter acceptable?

Dis (mm) Dgs (mm) Foundation, finest samples Foundation, coarsest samples Filter layer No. 1 Filter layer No. 2 Filter layer No. 3 Rock drain 0.024 0.12 0.1 0.9 0.3 2.0 1.0 3.5 10.0 40.0 5.0 15.0

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