2.1. Flow in the x-direction

Try these first

1. 1.

   What is permeability?

   Hint

   Think about how easily water flows through a sponge.

2. 2.

   Define constant head flow.

   Hint

   Consider the flow rate being stable.

3. 3.

   What method is suitable for coarse-grained soils?

   • Falling head method
   • Constant head method
   • Both methods

   Hint

   Think about grain size and flow stability.

4. 4.

   True or False: The falling head method measures flow rates by keeping the head constant.

   • True
   • False

   Hint

   Focus on the method's principle.

5. 5.

   A soil sample shows a constant flow of water at a rate of 0.5 L/min with a cross-sectional area of 0.1 m² and a head drop of 2 m over a 1 m length. Calculate its permeability.

   Hint

   Pay attention to the units and conversions.

6. 6.

   In a falling head test, water height drops from 80 cm to 30 cm in 15 minutes. Calculate permeability if the standpipe area is 0.05 m² and cross-section of the soil sample is 0.1 m².

   Hint

   Keep track of the drop in height and associated time.