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Errors with small volume elastic seepage meter bags.

Robert A Schincariol1, John D McNeil

  • 1Department of Earth Sciences, University of Western Ontario, London, Canada. schincar@uwo.ca

Ground Water
|November 12, 2002
PubMed
Summary
This summary is machine-generated.

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Small elastic collection bags, like condoms, show significant relaxation during seepage measurements, invalidating their use. Researchers recommend avoiding these elastic bags for accurate quantitative seepage data.

Area of Science:

  • Environmental Science
  • Hydrology
  • Geotechnical Engineering

Background:

  • Small elastic collection bags (condoms) are increasingly used in seepage meter studies.
  • Their use lacks extensive field or laboratory validation, particularly regarding elasticity's impact on measurements.

Purpose of the Study:

  • To investigate the mechanical relaxation and equilibration effects of elastic collection bags (condoms) on seepage measurements.
  • To determine the suitability of condoms for quantitative seepage studies.

Main Methods:

  • A laboratory study was conducted to assess condom behavior under conditions mimicking field seepage measurements.
  • Mechanical relaxation and water gain over time were measured under stagnant flow conditions.

Main Results:

Related Experiment Videos

  • Condoms exhibit significant mechanical relaxation over extended periods (e.g., nine hours).
  • Condoms gained 43 mL of water over nine hours, representing 50% of their workable volume.
  • This slow equilibration process invalidates simple volume subtraction correction methods.

Conclusions:

  • The mechanical relaxation and variability of condoms compromise quantitative seepage measurements.
  • Small-volume elastic measurement bags are not recommended for accurate seepage studies.