2.2. Flow in the z-direction

Try these first

1. 1.

   What is permeability in the context of soil?

   Hint

   Think about how water moves through soil.

2. 2.

   Which method would you use for measuring permeability in coarse-grained soils?

   Hint

   Consider which soils allow for steady head measurement.

3. 3.

   What method is best suited for measuring permeability in coarse-grained soils?

   • Falling Head Flow
   • Constant Head Flow
   • Both Methods

   Hint

   Consider which method provides a consistent measurement.

4. 4.

   True or False: The falling head flow method is used for coarse-grained soils.

   • True
   • False

   Hint

   Think about the soil types and the flow characteristics.

5. 5.

   An engineer tests a soil sample with a constant head permeability apparatus and measures a head drop of 20 cm over a 1 m sample length. Calculate the permeability if the cross-sectional area of the sample is 0.1 m².

   Hint

   Consider the formula and integration of variables involved to derive the permeability.

6. 6.

   A falling head permeameter shows a decrease from 60 cm to 30 cm over 5 minutes. What does this indicate about the soil type and permeability?

   Hint

   Analyze how quickly heads drop and apply the falling head calculation to draw conclusions.