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Related Concept Videos

Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Design Example: Design of an Irrigation Channel01:27

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Updated: Jun 27, 2026

Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity
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Determining hydraulic conductivity using pumping data from low-flow sampling.

Gary A Robbins1, Alejandra T Aragon-Jose, Andres Romero

  • 1Department of Natural Resources Management and Engineering, University of Connecticut, 1376 Storrs Road, Storrs, CT 06269-4087, USA. gary.robbins@uconn.edu

Ground Water
|December 2, 2008
PubMed
Summary
This summary is machine-generated.

Low-flow sampling provides statistically equivalent hydraulic conductivity values compared to slug testing. This reproducible method enhances water quality data and reduces site characterization costs.

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Area of Science:

  • Hydrogeology
  • Environmental Science
  • Geotechnical Engineering

Background:

  • Accurate hydraulic conductivity (K) assessment is crucial for groundwater resource management and contaminant transport modeling.
  • Traditional methods like slug testing can be time-consuming and costly, necessitating efficient alternatives.
  • Low-flow sampling, primarily used for water quality, offers potential for simultaneous K estimation.

Purpose of the Study:

  • To evaluate the equivalence of hydraulic conductivity values derived from low-flow sampling versus traditional slug testing.
  • To assess the reproducibility of hydraulic conductivity estimations using low-flow sampling parameters in real-world field conditions.
  • To determine the applicability and limitations of the low-flow sampling method for hydraulic conductivity determination.

Main Methods:

  • Compared hydraulic conductivity values obtained from steady-state low-flow sampling (discharge and drawdown) with those from slug testing across 12 wells.
  • Analyzed consultant data from three wells monitored quarterly by four technicians to assess the reproducibility of low-flow derived conductivity.
  • Investigated the practical range of applicability based on discharge rates, water level measurement accuracy, and regulatory constraints.

Main Results:

  • Hydraulic conductivity values from low-flow sampling were found to be statistically equivalent to those from slug testing.
  • Reproducibility of conductivity values using the low-flow method was within a factor of 2 or better across multiple sampling events and technicians.
  • The method is applicable for conductivity values greater than approximately 10^-6 cm/s, with an upper limit of 10^-3 to 10^-2 cm/s under typical field conditions.

Conclusions:

  • Low-flow sampling offers a viable and statistically equivalent alternative to slug testing for determining hydraulic conductivity.
  • The method enhances the utility of low-flow sampling data, potentially eliminating the need for separate slug tests and reducing overall site investigation costs.
  • Accurate measurement of steady-state conditions, flow rate, and drawdown is essential for reliable conductivity estimations using this approach.