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Updated: May 31, 2026

Optimizing Mouse Urodynamic Techniques for Improved Accuracy
06:46

Optimizing Mouse Urodynamic Techniques for Improved Accuracy

Published on: June 7, 2024

Improved characterization of small "u" for Jacob pumping test analysis methods.

Scott C Alexander1, Martin O Saar

  • 1Department of Earth Sciences, Newton Horace Winchell School of Earth Sciences, University of Minnesota, 310 Pillsbury Dr. SE, Minneapolis, MN 55455, USA. alexa017@umn.edu

Ground Water
|July 13, 2011
PubMed
Summary
This summary is machine-generated.

Hydrogeologists can improve pumping test analyses using the Jacob method by adjusting the maximum permissible u-value (u(max)). A higher u(max) allows more data, leading to more accurate aquifer property determinations.

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Area of Science:

  • Hydrogeology
  • Aquifer Testing Analysis
  • Geosciences

Background:

  • Traditional pumping test analyses, like the Jacob method, remain popular due to their simplicity, despite advancements in hydraulic tomography and inverse modeling.
  • Data-intensive methods face practical limitations in environments with limited wells or short screen lengths, posing physical and fiscal constraints.
  • Improved understanding of established methods like Theis and Jacob analyses is crucial for accurate interpretations in data-scarce settings.

Purpose of the Study:

  • To re-evaluate the assumptions and limitations of the Jacob method for pumping test analysis, particularly concerning the parameter u.
  • To propose a revised, higher maximum permissible u-value (u(max)) for the Jacob method to enhance data inclusion and interpretation accuracy.
  • To address the issue of data rejection in traditional Jacob analyses due to stringent u(max) values, which can lead to unrealistic aquifer parameter estimations.

Main Methods:

  • Analysis of drawdown data from an extensive well field in a glacial-outwash aquifer in Minnesota, USA.
  • Development of a new estimate for the maximum permissible u-value (u(max)) based on field data.
  • Comparison of proposed u(max) with traditionally accepted values (0.01 to 0.05) for Jacob distance-drawdown analyses.

Main Results:

  • The study proposes a significantly higher u(max) value, up to 0.2, for Jacob distance-drawdown analyses.
  • This increased u(max) allows for larger maximum radial distances (r(max)), incorporating data from more wells.
  • The revised u(max) reduces the likelihood of accepting inappropriate data from wells too close to the pumping source (r(min)).

Conclusions:

  • Adjusting the u(max) parameter in the Jacob method can overcome limitations associated with data-poor environments.
  • The proposed higher u(max) value enhances the utility of the Jacob method by allowing the inclusion of additional wells in pumping test analyses.
  • This refinement leads to more realistic determinations of aquifer transmissivity, permeability, and storativity.