If the hydraulic gradient is unity, then what is the ratio of flow across per unit area of soil is called?
A. Co-efficient of discharge
B. Co-efficient of viscosity
C. Co-efficient of seepage
D. Co-efficient of permeability
According to Darcy's Law, the rate of flow of water through soil is directly proportional to the hydraulic gradient and the cross-sectional area of flow. 
When the hydraulic gradient is unity (i=1) and the cross-sectional area is unity (A=1):
Therefore, the coefficient of permeability is defined as the discharge per unit cross-sectional area of soil under a unit hydraulic gradient.
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