ASTM D5785/D5785M
Standard Practice for (Analytical Procedure) for Determining Transmissivity of Confined Nonleaky Aquifers by Underdamped Well Response to Instantaneous Change in Head (Slug Test)
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About This Item
ASTM D5785/D5785M is the ASTM standard for an analytical procedure used to determine transmissivity of confined nonleaky aquifers by underdamped well response to an instantaneous change in head, commonly called a slug test. It provides a structured way to interpret aquifer behavior from well response data, helping support more consistent hydrogeologic evaluation. For groundwater professionals, this standard matters because it links field measurements to a repeatable technical approach for estimating transmissivity.
ASTM D5785/D5785M standard overview
This ASTM standard focuses on an analytical method for interpreting the response of a confined nonleaky aquifer after a sudden change in well head. By defining a practice for evaluating underdamped slug-test behavior, ASTM D5785/D5785M supports a more uniform approach to estimating transmissivity from field data. The standard is primarily technical in nature and is intended to guide analysis rather than describe broad site characterization. It is useful where a controlled, documented procedure is needed for groundwater assessment.
Where is ASTM D5785/D5785M used?
ASTM D5785/D5785M is commonly used in groundwater investigations where confined aquifer conditions are being evaluated through well response testing. It is relevant to field and consulting workflows that collect slug test data and then apply an analytical procedure to estimate transmissivity. The standard is typically used with monitoring or observation wells and related measurement equipment that records head changes over time. It is a practical reference for projects that need a consistent interpretation method for aquifer response.
Practical importance of ASTM D5785/D5785M
This standard matters because it helps reduce variation in how transmissivity estimates are derived from slug test results. Using ASTM D5785/D5785M can support more consistent technical reviews, better documentation, and clearer comparison of results across projects or wells. It may also help teams align testing and analysis practices during procurement, compliance work, or quality control for groundwater studies. For organizations that rely on defensible aquifer data, the standard offers a recognized analytical framework.
- Analytical procedure for slug test interpretation
- Confined nonleaky aquifer applications
- Underdamped well response analysis
- Transmissivity estimation from head change data
- Publication Date: 2020-12-17
- Publisher: ASTM
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