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Published on: October 31, 2011
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Evaluating Flow Distribution in a Multiaquifer Recharge Well Using an In Situ Flowmeter
Meredith B Martinez1, Mark A Widdowson1
1Department of Civil and Environmental Engineering, Virginia Tech, 750 Drillfield Drive, 200 Patton Hall, Blacksburg, Virginia, 24061.
Ground Water
|December 12, 2023
Summary
Flow distribution in managed aquifer recharge (MAR) wells varies significantly. Preferential flow occurs in upper screens during recharge and pumping, impacting groundwater quality and transport modeling.
Area of Science:
- Hydrogeology
- Environmental Engineering
- Water Resource Management
Background:
- Managed aquifer recharge (MAR) operations are crucial for groundwater management.
- Understanding flow dynamics in multi-screen wells is vital for MAR efficiency and groundwater quality.
Purpose of the Study:
- To quantify flow rate distribution in a multi-screen MAR well.
- To analyze flow patterns during both recharge and pumping cycles.
- To assess the implications of flow distribution on groundwater transport.
Main Methods:
- Deployment of an impeller flowmeter in a multi-screen MAR well.
- Measurement of flow rates under both recharge and pumping conditions.
- Comparison of current flow data with historical measurements.
Main Results:
- Preferential flow was observed in the uppermost screens during recharge.
- Flow distribution was more uniform across all screens during pumping.
- Flow consistently favored the upper sections of individual screens in both operational modes.
- Flow distribution can change over time due to well conditions and rehabilitation.
Conclusions:
- Flow distribution in multi-screen wells is dynamic and site-specific.
- Inconsistent flow patterns necessitate ongoing monitoring in MAR projects.
- Accurate flow distribution data is essential for reliable groundwater transport modeling and quality assessment.
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