Seepage in Earth Dam | Seepage Analysis & Control Measures

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The embankment soil or foundation soil which is surrounded by the filter materials is called base materials. When the ratio of D15 of filter to D85 of base materials is less than 4 to 5, the base material is prevented from passing through the filters.

Similarly,foundation when the ratio of D15 of filter materials to D85 of the base material is greater than 5, the seepage forces in the filters are controlled up to the permissible magnitude.