In 1984, Darcy publish a simple equation for the discharge velocity of water through saturated soil with a simple equation below;
v=Ki
v = discharge velocity (flow of water right angles to the of the cross section)
K = permeability coefficient or hydraulic conductivity
Dacy got this equation from experiments he did in clean sand which flows water, v is discharge of velocity of water based on gross cross section of soil, but in actual case void space velocity of water is high than v, relationship between the discharge velocity and the seepage velocity can be derived as
vs = v/n
vs= seepage velocity
n= porosity
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