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Huntley's LNAPL Transmissivity Baildown Test Method Revisited.
Martin J Hamper, Mir SeyedAbbasi1
1Roux Associates, Inc, 1301 W. 22nd Street, Suite 800, Oak Brook, IL, 60523.
Ground Water
|March 8, 2026
Summary
A mathematical error in Huntley's Method 1 for estimating light non-aqueous phase liquid (LNAPL) transmissivity leads to overestimations. Correcting this error is crucial for accurate assessments and to avoid unnecessary remediation costs.
Area of Science:
- Hydrogeology
- Environmental Engineering
- Petroleum Engineering
Background:
- Baildown tests are cost-effective for estimating aquifer transmissivity.
- Huntley's Method 1, based on Bouwer and Rice (1976), was developed for LNAPL transmissivity.
- Batu (2012) noted Huntley's Method 1 included a density correction factor, unlike other methods.
Purpose of the Study:
- To re-examine the derivation of Huntley's Method 1.
- To identify and correct a mathematical error in Huntley's Method 1.
- To assess the impact of the error on LNAPL transmissivity estimations.
Main Methods:
- Detailed review of the mathematical derivation of Huntley's Method 1.
- Comparison with the Bouwer and Rice (1976) rising head slug test method.
- Analysis of the implications of the density correction factor error.
Main Results:
- A mathematical error in Huntley's Method 1 was identified, leading to an incorrect density correction factor.
- The corrected Huntley Method 1 equation is equivalent to the Bouwer and Rice (1976) equation.
- The error causes LNAPL transmissivity to be overestimated by 4 to 10 times.
Conclusions:
- The density correction factor in Huntley's Method 1 is erroneous.
- The corrected Huntley Method 1 should be adopted for accurate LNAPL transmissivity.
- Kirkman's (2013) J-ratio method, based on the uncorrected Huntley Method 1, requires reconsideration.
