2.5.1. Darcy’s Law

Try these first

1. 1.

   Define Darcy's Law.

   Hint

   What is the equation associated with Darcy's Law?

2. 2.

   What does the coefficient of permeability (k) measure?

   Hint

   Think about how easily water can flow through soil.

3. 3.

   What equation represents Darcy's Law?

   Hint

   What does each symbol represent in the equation?

4. 4.

   True or False: Higher void ratios decrease soil permeability.

   • True
   • False

   Hint

   What is the relationship between voids and flow pathways?

5. 5.

   A network of pipes is designed to drain excess water from a clayey soil with a permeability of 1 × 10^-7 m/s. Calculate the expected discharge if the hydraulic gradient is 0.3 and the cross-sectional area of the pipe is 0.5 m².

   Hint

   Use the formula for discharge with the given values.

6. 6.

   You are tasked with evaluating two different soil types for a highway project. Soil A has a permeability of 2 × 10^-5 m/s, while Soil B has 5 × 10^-6 m/s. How would this difference affect your design of drainage measures?

   Hint

   Compare how permeability impacts drainage needs.