Using recovery data to extend the effective duration of pumping tests

Area of Science:

• Hydrogeology
• Hydrology
• Aquifer testing

Background:

• Water-level recovery data collection is standard practice during pumping tests.
• This data is often underutilized despite its potential to reveal crucial aquifer characteristics.
• Existing methods may not fully leverage the information contained within recovery data.

Purpose of the Study:

• To present and elaborate on a general method for utilizing water-level recovery data to extend the effective duration of pumping tests.
• To demonstrate the applicability of this method across diverse hydrogeologic conditions.
• To highlight the increased value derived from pumping tests by maximizing the use of residual drawdown data.

Main Methods:

• The study focuses on a method proposed by van der Kamp (1989).
• This method applies the principle of superposition, assuming linear aquifer response.
• It requires only the collection of water-level recovery data post-pumping.

Main Results:

• The method effectively extends the analytical duration of pumping tests.
• It is applicable to both simple and complex hydrogeologic environments.
• No specific aquifer properties are assumed beyond linearity.

Conclusions:

• The proposed method significantly enhances the value of pumping tests by incorporating recovery data.
• It provides a straightforward approach to extend the effective test duration.
• This technique maximizes information extraction from residual drawdowns, offering broader insights into aquifer behavior.