It is important to keep the saturation gradient line within the body of a embankment of canal, the saturation gradient line in loomy soils lie at___________________?

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It is important to keep the saturation gradient line within the body of a embankment of canal, the saturation gradient line in loomy soils lie at___________________?

A. 1:2 to 1:4
B. 1:3 to 1:5
C. 1:4 to 1:6
D. 1:5 to 1:7