the discharge velocity of the soil sample having coefficient of permeability 2.15 x 10⁻³cm/sec and unit hydraulic gradient is:
a. 2.15 x 10⁻³ cm/sec
b. 7.82 x 10⁻³ cm/sec
c. 10 x 10⁻³ cm/sec
d. 5.30 x 10⁻³ cm/sec