1.2.2. Boundary Between Permeable and Impermeable Soil Materials

Try these first

1. 1.

   What is the main purpose of flow nets?

   Hint

   Think about how we need to see the path of water.

2. 2.

   Name the two types of lines that make up a flow net.

   Hint

   One shows direction and the other shows head.

3. 3.

   What do flow lines in a flow net represent?

   • Water pressure
   • Flow direction
   • Soil type

   Hint

   Think of arrows showing movement.

4. 4.

   True or False: Equipotential lines can be considered as flow lines.

   • True
   • False

   Hint

   Remember their distinct roles.

5. 5.

   Design a flow net for a hypothetical site where permeable soil layers are underlain by an impermeable layer. Describe the steps taken in constructing your flow net.

   Hint

   Focus on defining the boundaries clearly first.

6. 6.

   How would you determine the effect of adding a layer of impermeable material atop a permeable layer on the flow net?

   Hint

   Consider how water reacts to new barriers.