The critical hydraulic gradient ic in terms of specific gravity G and voids ratio e is given by ______

The critical hydraulic gradient ic in terms of specific gravity G and

1.	The critical hydraulic gradient ic in terms of specific gravity G and voids ratio e is given by ______
A.	Ge
B.	G/e
C.	\(\frac{G-1}{1+e}\)
D.	\(\frac{G+1}{1-e}\)
Answer» D. \(\frac{G+1}{1-e}\)