36.5.2. Confined Aquifer

Try these first

1. 1.

   What defines a confined aquifer?

   Hint

   Think about the layers that surround the water.

2. 2.

   What happens to the water level in a well that taps into a confined aquifer?

   Hint

   Consider the pressure dynamics.

3. 3.

   What characterizes confined aquifers?

   • They are always dry
   • They are under pressure
   • They have no water

   Hint

   Think about what keeps the water inside.

4. 4.

   True or False: The storage coefficient in confined aquifers is generally higher than in unconfined aquifers.

   • True
   • False

   Hint

   Consider the mechanism behind water storage.

5. 5.

   A confined aquifer has a storage coefficient of 0.0004. If the hydraulic head decreases by 4 meters, calculate the volume of water that would be released from a 1-hectare section of the aquifer.

   Hint

   Use the formula for volume release of a confined aquifer.

6. 6.

   If a well tapping a confined aquifer results in a drawdown of 10 meters, and the aquifer has a transmissibility of 100 m²/day. Find out how long it would take for the water level to recover to original state if pumping stops.

   Hint

   Analyze recovery data or graphically review recuperation tests for similar conditions.