36.7. Well Constants

Try these first

1. 1.

   What is the Theis equation used for?

   Hint

   Look for keywords like drawdown and pumping tests in your notes.

2. 2.

   Define drawdown in the context of groundwater.

   Hint

   Think about what happens to the water level when you extract water.

3. 3.

   What does the Theis equation calculate?

   • Storage capacity
   • Drawdown
   • Fluid viscosity

   Hint

   Focus on what happens to water levels when pumping occurs.

4. 4.

   True or False: Transmissibility indicates how easily water can move through an aquifer.

   • True
   • False

   Hint

   Think about the flow dynamics of groundwater.

5. 5.

   Consider a scenario where a well shows a drawdown of 4 meters after 10 hours of pumping at a rate of 50 m³/day. If the transmissibility of the aquifer is 200 m²/day, estimate the distance 'r' from the well that would yield the observed drawdown using the Theis equation.

   Hint

   Break down each piece of the equation and consider how you’d isolate r.

6. 6.

   Using empirical data from aquifer tests, describe how you would create a time-drawdown curve and calculate the well constants.

   Hint

   Remember, the curve serves as a visual guide to understanding aquifer behavior.