41.6.2. Darcy’s Law

Try these first

1. 1.

   What is Darcy's Law used to calculate?

   Hint

   Think about water movement and soil.

2. 2.

   Define hydraulic conductivity.

   Hint

   Consider what affects water flow.

3. 3.

   What does Q represent in Darcy's Law?

   • Hydraulic Gradient
   • Discharge
   • Hydraulic Conductivity

   Hint

   Think about what flow means.

4. 4.

   True or False: Hydraulic conductivity is a measure of how easily water can flow through soil.

   • True
   • False

   Hint

   Consider how water behaves in different soils.

5. 5.

   Given a soil with hydraulic conductivity of 10 cm/s, calculate the discharge (Q) through an area of 1 m² with a hydraulic gradient of 0.01.

   Hint

   Convert units if needed and remember the formula.

6. 6.

   If a drainage system is designed to handle 5 m³/day and the soil's K is 0.2 cm/s, what area is needed at a hydraulic gradient of 0.005?

   Hint

   Convert your discharge rate to consistent units.