36.7.2. Theis Equation

Try these first

1. 1.

   What is drawdown?

   Hint

   Consider the static water level before pumping.

2. 2.

   What does the variable Q represent in the Theis Equation?

   Hint

   Think about the flow rate of water.

3. 3.

   What does the Theis Equation primarily help us calculate?

   • Aquifer permeability
   • Drawdown and transmissibility
   • Well depth

   Hint

   Focus on the purpose of the equation.

4. 4.

   True or False: The well function W(u) accounts for time and distance effects.

   • True
   • False

   Hint

   Think about what 'function' means in this context.

5. 5.

   A well pumps at 0.015 m³/s, and the drawdown is observed as 4 meters in 2 days at a distance of 25 meters. Calculate the transmissibility using the Theis Equation.

   Hint

   Use the formula for W(u) and calculate the values stepwise.

6. 6.

   During a field study, a monitored well shows an initial static water level of 10m. After 12 hours of pumping, the level drops to 7m. The transmissibility calculated is 12 m²/day. What is the well function W(u)?

   Hint

   Remember to use the drawdown and time in the correct units.