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Single-Well Injection-Drift Test to Estimate Groundwater Velocity.

Charles Paradis¹, Nathan Van Ee², Kendyl Hoss¹

¹Department of Geosciences, University of Wisconsin at Milwaukee, Milwaukee, WI, USA.

|February 14, 2022

Summary

This summary is machine-generated.

A new single-well injection-drift test method accurately estimates groundwater velocity. This rapid technique avoids costly extraction, offering a simpler alternative for hydrogeological studies.

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Area of Science:

Hydrogeology
Environmental Science

Background:

Traditional groundwater velocity estimation methods are often time-consuming and expensive, requiring extensive fieldwork.
The extraction phase in conventional tests can be a significant bottleneck in terms of cost and duration.

Purpose of the Study:

To present a novel, simplified algebraic equation for estimating groundwater velocity.
To validate a new single-well injection-drift test method against established multi-well techniques.

Main Methods:

A single-well injection-drift test involving forced-gradient injection of tracer-amended water.
Monitoring conservative solute tracers during natural-gradient drift back through the well.
Analyzing breakthrough curve data to determine mean tracer travel times.
Comparing single-well results with dual-well (1D) and multi-well (2D) tracer transport data.

Main Results:

The single-well injection-drift test estimated groundwater velocity at approximately 0.64 ft/day.
Dual-well analysis yielded a groundwater velocity of 0.55 ft/day.
Multi-well analysis indicated a groundwater velocity of 0.60 ft/day.
Results from the single-well method showed excellent agreement with dual- and multi-well analyses.

Conclusions:

The developed algebraic equation and single-well injection-drift test provide a simple, rapid, and effective means to estimate groundwater velocity.
The method eliminates the need for a costly and time-consuming extraction phase.
This approach offers a validated and efficient alternative for hydrogeological investigations.