Question
Download Solution PDFThe law of flow of water through the soil was first studied by ___________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Darcy's law states that there is a linear relationship between flow velocity (v) and hydraulic gradient (i) for any given saturated soil under steady laminar flow conditions.
If the rate of flow is q (volume/time) through a cross-sectional area (A) of the soil mass, Darcy's Law can be expressed as
v = q/A = k × i
Darcy’s law is valid for fine saturated sands only.
Where
k = permeability of the soil
i = Δh /L
Δh = difference in total heads
L = length of the soil mass
Darcy law represents the statistical macroscopic equivalent of Naiver-stokes equations of motion for the viscous flow of ground water.
Additional Information
Permeability of different soil are as follows:
|
Soil type |
Coefficient of permeability (cm/sec) |
|
Clear gravel |
1.0 and greater |
|
Clear sand (coarse) |
1.0 to 10-2 |
|
Sand |
10-2 to 5 × 10-2 |
|
Fine sand |
5 × 10-2 to 1 × 10-3 |
|
Silty sand |
2 × 10-3 to 1 × 10-4 |
|
Silt |
5 × 10-4 to 1 × 10-5 |
|
Clay |
1 × 10-6 and smaller |
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