To make certain that the backfill material is more pervious than the soil to be drained, the relationship used in

(D15)Filter ‚â§ 5 (D85)Protected soil

(D15)Filter ‚â• 5 (D85)Protected soil

(D15)Filter ‚â• 5 (D15)Protected soil

(D15)Filter ‚â§ 5 (D15)Protected soil

To make certain that the backfill material is more pervious than the s

1.	To make certain that the backfill material is more pervious than the soil to be drained, the relationship used in
A.	(D15)Filter ‚â§ 5 (D85)Protected soil
B.	(D15)Filter ‚â• 5 (D85)Protected soil
C.	(D15)Filter ‚â• 5 (D15)Protected soil
D.	(D15)Filter ‚â§ 5 (D15)Protected soil
Answer» E.

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To make certain that the backfill material is more pervious than the soil to be drained, the relationship used in

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