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The Safe Yield and Climatic Variability: Implications for Groundwater Management.

Hugo A Loáiciga1

  • 1Department of Geography, University of California, Santa Barbara, CA 93106.

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PubMed
Summary

Calculating safe yield for groundwater requires careful consideration of climate variability. An adaptive management strategy, linking extraction to discharge, is recommended for sustainable groundwater management.

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Area of Science:

  • Hydrogeology
  • Water Resource Management
  • Environmental Science

Background:

  • Determining safe yield is crucial for sustainable groundwater management.
  • Karst aquifers present unique challenges due to their dynamic nature.
  • Climatic variability significantly impacts groundwater resources.

Purpose of the Study:

  • To evaluate methods for calculating safe yield in karst aquifers.
  • To assess the influence of climatic variability on safe yield determination.
  • To propose an adaptive management strategy for sustainable groundwater extraction.

Main Methods:

  • Analysis of a long-term, high-quality dataset of groundwater recharge, discharge, extraction, and precipitation.
  • Evaluation of methods for establishing a climatically representative period for safe yield assessment.
  • Application of safe yield calculation methods to the Edwards Aquifer in Texas.

Main Results:

  • The study highlights that safe yield is a baseline, not an operational rule for all climatic conditions.
  • Safe yield calculations must account for climatic variability to ensure accuracy.
  • The safe yield of the Edwards Aquifer was estimated to be approximately half of its average annual recharge.

Conclusions:

  • Adaptive groundwater management, linking extraction to discharge rates, is more appropriate than static safe yield calculations.
  • Sustainable groundwater management requires dynamic strategies that respond to changing climatic conditions.
  • Accurate assessment of groundwater recharge and discharge is essential for effective water resource planning.