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Optimized system to improve pumping rate stability during aquifer tests.

Michael H Young1, Todd C Rasmussen, F Comer Lyons

  • 1Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV 89119, USA. michael@dri.edu

Ground Water
|November 12, 2002
PubMed
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This study presents an inexpensive, mobile system to reduce uncertainty in aquifer tests by accounting for dynamic head losses. The optimized flow rate system ensures statistically significant, constant pumping for accurate aquifer hydraulic property estimation.

Area of Science:

  • Hydrogeology
  • Environmental Engineering
  • Geophysics

Background:

  • Aquifer tests are crucial for estimating hydraulic properties.
  • Traditional methods assume constant pumping rates, leading to uncertainties.
  • Dynamic head losses during early stages of testing cause flow rate variations.

Purpose of the Study:

  • To present a novel system for reducing uncertainty in aquifer tests.
  • To explicitly account for dynamic head losses at the borehole-formation interface.
  • To optimize flow rate control for various aquifer test types.

Main Methods:

  • Utilized a system with a datalogger, pressure transducers, variable-speed pump motor, flow controller, and flowmeters.
  • Developed a control system that optimizes flow rate by accounting for dynamic head losses.

Related Experiment Videos

  • Demonstrated the system in withdrawal and injection tests across three diverse aquifers.

    • Main Results:

    • The system significantly reduced uncertainties associated with dynamic head losses.
    • Achieved a statistically significant, constant flow rate over time.
    • Pumping variability (95% confidence interval) ranged from +/- 2.58 x 10(-4) L/sec to +/- 9.07 x 10(-4) L/sec.

    Conclusions:

    • The presented system is inexpensive, mobile, and adaptable to various aquifer test configurations.
    • It provides a reliable method for obtaining constant flow rates, enhancing aquifer property estimation.
    • The system demonstrated effectiveness across different field and aquifer conditions.