ASTM D4105/D4105M
Standard Practice for (Analytical Procedure) for Determining Transmissivity and Storage Coefficient of Nonleaky Confined Aquifers by the Modified Theis Nonequilibrium Method
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About This Item
ASTM D4105/D4105M is the ASTM standard for an analytical procedure used to determine transmissivity and storage coefficient of nonleaky confined aquifers by the Modified Theis nonequilibrium method. It provides a recognized technical approach for evaluating aquifer response from pumping-test data, helping users interpret hydraulic behavior with greater consistency. For projects involving groundwater assessment, the standard supports more reliable analysis, clearer documentation, and better alignment between field results and engineering decisions.
Overview of ASTM D4105/D4105M
This practice addresses the analytical steps used to estimate transmissivity and storage coefficient from nonequilibrium conditions in nonleaky confined aquifers. ASTM D4105/D4105M is centered on the Modified Theis method, which is commonly applied to pumping-test interpretation where confined aquifer behavior must be assessed from drawdown data. As a standards document, it helps define a repeatable framework for analysis so results can be compared more consistently across studies, consultants, and project records.
Common use cases of ASTM D4105/D4105M
This standard is commonly used in groundwater investigations, aquifer testing programs, and hydrogeologic evaluations where confined aquifer properties need to be determined from field data. It is relevant when interpreting pumping-test results for water-supply studies, site characterization, or subsurface engineering work. ASTM D4105/D4105M is typically referenced by professionals who need a structured analytical practice for converting drawdown measurements into transmissivity and storage coefficient estimates.
Benefits of using ASTM D4105/D4105M
Using ASTM D4105/D4105M supports more consistent interpretation of pumping-test data and helps reduce variation between analysts. It is useful for technical documentation, procurement specifications, and compliance-oriented workflows where a recognized ASTM practice is preferred. The standard can also improve confidence in hydrogeologic comparisons by giving users a defined procedure for evaluating confined aquifer performance. In practice, that helps lower uncertainty and strengthens decision-making for groundwater-related projects.
- Modified Theis nonequilibrium analysis
- Transmissivity estimation
- Storage coefficient evaluation
- Nonleaky confined aquifer testing
- Pumping-test data interpretation
- Publication Date: 2020-12-17
- Publisher: ASTM
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