1.2. Falling Head Flow

Try these first

1. 1.

   What is the primary use of the Falling Head Flow method?

   Hint

   Think about what properties of soil we assess.

2. 2.

   What does a decrease in head in the standpipe indicate?

   Hint

   Consider the function of the standpipe in our experiments.

3. 3.

   What is the function of the standpipe in the Falling Head Flow test?

   • To measure water pressure
   • To measure water head changes
   • To create pressure differences

   Hint

   Consider what measurements are critical in this experiment.

4. 4.

   Darcy's Law is applied to which type of flow in Falling Head Flow?

   • True
   • False

   Hint

   Think about core principles related to fluid movement.

5. 5.

   In a lab, a soil sample achieved a head drop from 80 cm to 30 cm over 45 seconds with a standpipe area of 5 cm². Calculate its permeability assuming the sample area is 20 cm².

   Hint

   Remember to convert your head values to meters for accurate calculations.

6. 6.

   Discuss how higher clay content in a soil influences its permeability as measured by Falling Head Flow and the implications this has for construction projects.

   Hint

   Consider properties of clay and how they differ from coarse-grained soils.