Question

For Following Multiple Choice All Correct Answers Which Applied To Each Question.

5. The average linear velocity is always greater than the specific discharge.

• True
• False

6. In which of the following situations might Darcy’s law not apply?

• for very permeable materials with very high flow rates.
• for very low hydraulic gradients in some low-permeability materials, such as clays.
• for flow through crystalline rocks.
• for the flow of air through a porous air filter.

7. The terms aquifer, aquitard, aquifuge, and aquiclude all refer to saturated geological formations. They are distinguished on the basis of their properties, such as permeability. Which of the following statement are true for aquifer?

• It neither contains nor transmits significant quantities of water under normal field conditions.
• Clays and shales can be used for water supply.
• It is a formation that can be used for water supply.
• It is a formation of generally low permeability.

8. The water table:

• forms the upper boundary of an unconfined aquifer.
• is a surface along which the (gage) pressure is zero.
• is determined by the water level in a well with an unconfined aquifer.
• is called the potentiometric surface in a confined aquifer.

Answer 1

Answer-

5. True As the Average or Seepage velocity  is the ratio of the Darcy velocity or Specific Discharge and the porosity and the porosity being less than 1, thus the average or seepage velocity is greater than the specific Discharge.

6.Option A and B The Darcy law is not applicable in the following conditions-

.For very low Hydraulic Gradient

.The materials which have very high permeability and high flow rate

.The material which have very low permeability like clay.

7.Option C Aquifer is a geological formation in which water is stored and can be used for the water supply.

8.Option A B and C The water in the aquifer has following features-

In the unconfined aquifer it forms the upper boundary  and has the water level.In this gauge pressure is 0.