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Depletion Mapping and Constrained Optimization to Support Managing Groundwater Extraction.

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Groundwater depletion mapping helps manage competing water demands. This study presents methods for sustainable groundwater management, balancing water use and stream baseflow restoration.

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Area of Science:

  • Hydrology
  • Water Resource Management
  • Environmental Science

Background:

  • Groundwater models are crucial for managing competing water uses like agriculture, industry, and ecosystems.
  • Depletion potential mapping quantifies well impacts on stream baseflow, essential for oversubscribed basins.
  • The Little Plover River basin faces reduced baseflow due to groundwater withdrawals, impacting a vital trout stream.

Purpose of the Study:

  • To develop and illustrate groundwater management approaches for balancing water use and stream baseflow.
  • To provide tools for resource managers and stakeholders to make informed decisions in groundwater management.
  • To address the challenge of restoring river flow while minimizing disruption to groundwater extraction.

Main Methods:

  • Depletion potential mapping to assess well impacts on stream baseflow.
  • Developing management scenarios including stakeholder proposals and systematic pumping adjustments.
  • Utilizing constrained optimization and K-means clustering for well grouping and impact analysis.

Main Results:

  • Demonstrated multiple management approaches based on depletion potential mapping.
  • Illustrated the application of these techniques in the Little Plover River basin.
  • Showcased methods for quantifying tradeoffs between water use and stream baseflow.

Conclusions:

  • The presented approaches offer a framework for collaborative groundwater management.
  • These methods facilitate shared governance and effective, minimally disruptive changes in groundwater extraction.
  • The study provides guidance for restoring river flow and ensuring sustainable water resource management.