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A stream depletion field experiment.

B Hunt1, J Weir, B Clausen

  • 1Civil Engineering Department, University of Canterbury, Christchurch, New Zealand. b.hunt@civil.canterbury.ac.nz

Ground Water
|April 5, 2001
PubMed
Summary
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This study quantifies aquifer transmissivity (T), storage coefficient (S), and streambed leakage (lambda) using field data from a well near a stream. Analysis of well drawdowns and stream depletion provides consistent results for these key hydrogeologic parameters.

Area of Science:

  • Hydrogeology
  • Environmental Science
  • Water Resource Management

Background:

  • Understanding groundwater-surface water interactions is crucial for sustainable water management.
  • Aquifer properties like transmissivity (T) and storage coefficient (S) govern groundwater flow.
  • Quantifying streambed leakage (lambda) is essential for accurate stream depletion assessments.

Purpose of the Study:

  • To determine aquifer transmissivity (T), storage coefficient (S), and streambed leakage (lambda) using field data.
  • To compare field measurements with a theoretical solution (Hunt, 1999) for hydrogeologic parameter estimation.
  • To evaluate the consistency and applicability of the chosen analytical method.

Main Methods:

  • Field experiment involving water abstraction from a well adjacent to a stream.

Related Experiment Videos

  • Analysis of observation well drawdowns using a match-point method for early-time data to determine T and S.
  • Analysis of stream depletion flows at later times to estimate the streambed leakage parameter (lambda).

    • Main Results:

    • Aquifer transmissivity (T), storage coefficient (S), and streambed leakage (lambda) were successfully estimated.
    • The determined hydrogeologic parameters showed reasonable consistency across four observation wells.
    • The study validated the use of Hunt's (1999) solution for analyzing field data.

    Conclusions:

    • The integrated approach of analyzing well drawdowns and stream depletion effectively characterizes key hydrogeologic parameters.
    • The findings provide valuable data for managing water resources in areas with connected groundwater and surface water systems.
    • Discussion of alternative methods for estimating lambda offers further insights for hydrogeologic investigations.