35.5. Methods of Determining Specific Yield

Try these first

1. 1.

   What is the percentage of specific yield for a material that allows 20% of its volume to drain?

   Hint

   Remember, specific yield is expressed as a percentage.

2. 2.

   Name one laboratory method for determining specific yield.

   Hint

   Think about methods that involve specific testing in a lab.

3. 3.

   What method involves measuring water loss due to gravity drainage?

   • Centrifuge Method
   • Gravimetric Method
   • Hydraulic Conductivity Test

   Hint

   Focus on which method directly involves gravity.

4. 4.

   True or False: Tracer tests are only conducted in laboratory settings.

   • True
   • False

   Hint

   Consider where such testing is commonly applied.

5. 5.

   You have observed that during a pumping test, the water level in a piezometer drops by 5 feet and recovers to 4.5 feet after an hour. Calculate the specific yield if the area of influence is 10 acres.

   Hint

   Convert feet to a consistent volume unit for calculations.

6. 6.

   Design an experiment to combine both the gravimetric and centrifuge methods to analyze specific yield. What would be the expected outcomes, and how would you justify your approach?

   Hint

   Think about controlling variables effectively while utilizing both methods.