Darcy Seepage Velocity
Darcy Seepage Velocity
Darcy’s law governs slow water flow through soil, the basis of seepage, drainage and dewatering analysis.
The Darcy velocity is v = k·i. where k is the permeability and i the hydraulic gradient.
Inputs
k := 1e-5 m/s=1e-05 m/s
i := 0.4=0.4
Multiply permeability by hydraulic gradient.
v := k·i=4e-06 m/s
Results
This superficial velocity, multiplied by area, gives the seepage flow. The actual pore velocity is higher because flow only passes through the voids.
Assumptions & limitations
- Laminar (Darcy) flow.
- Saturated soil.
- Constant permeability.