On-Demand Webinars

PUMPING TESTS FOR AQUIFER EVALUATION:
Part 2: Fundamentals of Pumping Test Interpretation

Part Two of a Comprehensive 4-Part Webinar Series on Aquifer Pumping Tests

This four part webinar series is designed to give consulting scientists and engineers and regulators the information they need to get reliable information from aquifer pumping tests.

Pumping tests are commonly used at sites for acquiring information about the transmissive properties and hydraulic boundary conditions of subsurface units. Unfortunately, much of the information currently obtained from pumping tests is of questionable quality as a result of inappropriate field and analysis procedures.

Technical Level: Intermediate to Advanced.

Webinar attendees will learn practical guidelines and the fundamentals for selecting the most appropriate analysis strategy along with interpreting various common solutions for pumping test data.

Part 2 of this webinar series provides a detailed discussion of the fundamental aspects of the Theis model of aquifer response to pumping and the interpretation of drawdown data with the Theis analysis. The Theis model incorporates a set of relatively restrictive assumptions. As practitioners, we must recognize that many of these assumptions will be violated to varying degrees during actual tests. Nevertheless, the Theis model of aquifer response to pumping has enduring value as a benchmark against which we can assess the observed responses to pumping and diagnose the actual conditions at our site. In essence, checking site conditions against a list of the ideal assumptions allows us to identify the conceptual model that best describes our own site.

Participants will be able to immediately apply these skills to their work to significantly improve the quality of parameter estimates obtained from pumping tests.








Webinar Outline and Highlights:

• Theis conceptual model
• The Theis solution
• Theis analysis of drawdown data
• Cooper and Jacob (1945) approximation
• Cooper-Jacob analyses of drawdown data
• Motivation for using Cooper-Jacob analyses
• Choosing between the Theis and Cooper-Jacob analyses
• Composite analyses
• Application of the Theis model for heterogeneous aquifers
• Take home points
• References

We cannot isolate skin effects or in-well nonlinear losses with a constant-rate test. To gain more insight into well performance we must conduct a step test. Part 3 of this series addresses step drawdown tests.







Chris Neville is internationally-recognized for his work and significant advances in aquifer pumping tests. Whether you want to apply aquifer pumping tests to hydrogeologic characterization, water supply development or remediation design, this webinar will provide attendees with information that is not available elsewhere on the web.