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Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
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A groundwater security model based on hydraulic turnover times and flow compartments.

Fernando António Leal Pacheco1, Marília Carvalho de Melo2, Teresa Cristina Tarlé Pissarra3

  • 1Centro de Química de Vila Real (CQVR), Universidade de Trás-os-Montes e Alto Douro (UTAD), Ap. 1013, Vila Real 5001-801, Portugal.

Methodsx
|July 8, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel groundwater security method using stream flow and watershed areas to assess aquifer yield, self-depuration, and resilience. Most watersheds show moderate to high security, with arid regions being less secure.

Keywords:
Aquifer resilienceAquifer self-depuration capacityAquifer yield capacityGroundwater dischargeHydraulic turnover timeSustainable water supplyWatershed mobile storage

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Area of Science:

  • Hydrology
  • Environmental Science
  • Water Resource Management

Background:

  • Assessing groundwater security at the catchment scale is crucial for sustainable water management.
  • Existing methods often require complex data, limiting their widespread application.
  • A simplified approach using readily available data is needed to evaluate groundwater security.

Purpose of the Study:

  • To develop and validate a novel groundwater security assessment method at the catchment scale.
  • To establish aquifer security indicators based on groundwater discharge, hydraulic turnover time, and mobile storage.
  • To evaluate the groundwater security of watersheds in continental Portugal.

Main Methods:

  • A log-linear relationship was established between groundwater discharge per unit drainage area (Q/Ab), hydraulic turnover time (t), and aquifer mobile storage (z).
  • Previously published approaches were embedded to calculate Q/Ab, t, and z using solely stream flow discharges and watershed areas.
  • Calculated variables were recast as aquifer security indicators (SQ, St, and Sz) representing yield capacity, self-depuration capacity, and resilience, respectively.

Main Results:

  • The developed method successfully assessed groundwater security using stream flow and watershed areas for 294 hydrometric stations in Portugal.
  • A majority of watersheds were found to be moderately to highly secure, particularly regarding self-depuration capacity (St > 62%).
  • A small percentage (7-10%) of watersheds were classified as very highly secured, while less secure basins were predominantly in arid regions.

Conclusions:

  • The developed groundwater security method is effective and relies on minimal, easily obtainable data.
  • The method provides valuable insights into watershed yield, aquifer self-depuration, and resilience.
  • The approach is adaptable and can be transposed globally with regional adjustments, offering a scalable tool for water resource management.