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<p>Groundwater level monitoring is essential for assessing groundwater dynamics to determine past and future trends. When integrated with models, groundwater level fluctuations can be predicted in the short to medium term using precipitation probabilities or meteorological forecasts. This is the purpose of the ‘MeteEAU Nappes’ tool implemented by BRGM (French geological survey) for the City of Cape Town (CoCT) for the Table Mountain Group Aquifers (TMGA). This case study shows how near real-time groundwater level monitoring can be used to support the municipality in managing future groundwater withdrawals. The TMGA are an important source of groundwater in the Western Cape region of South Africa. The upper Nardouw aquifer of the TMGA is an unconfined to semi-confined aquifer recharged by rainfall. It was monitored in the Steenbras area for over 10&#xa0;years before the CoCT started groundwater abstraction from the Steenbras Wellfield in 2021. The MeteEAU Nappes forecasting tool is already implemented for many observation wells of the national piezometric network of France where it is used for decision-making by the French administration for measures regarding drought or flood anticipation. It combines real-time hydrological observations with a lumped model (e.g. GARDENIA) to simulate groundwater level and extrapolates observations for the following 6 months from statistical meteorological scenarios combined with abstraction scenarios. This tool can help to protect the TMGA targeted at Steenbras Wellfield as a critical source of water for the CoCT, along with ensuring continued ecological functioning of various groundwater-dependent ecosystems.</p>

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From monitoring to near real-time groundwater forecasting: a case study of the Cape Town Table Mountain Group aquifers, South Africa

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Alexis Gutierrez,
  • Bruno Mougin,
  • Jérôme Nicolas,
  • Violaine Bault,
  • Candice Lasher-Scheepers,
  • Lloyd Fisher-Jeffes,
  • Philani Msimango,
  • Alexander Ncube

摘要

Groundwater level monitoring is essential for assessing groundwater dynamics to determine past and future trends. When integrated with models, groundwater level fluctuations can be predicted in the short to medium term using precipitation probabilities or meteorological forecasts. This is the purpose of the ‘MeteEAU Nappes’ tool implemented by BRGM (French geological survey) for the City of Cape Town (CoCT) for the Table Mountain Group Aquifers (TMGA). This case study shows how near real-time groundwater level monitoring can be used to support the municipality in managing future groundwater withdrawals. The TMGA are an important source of groundwater in the Western Cape region of South Africa. The upper Nardouw aquifer of the TMGA is an unconfined to semi-confined aquifer recharged by rainfall. It was monitored in the Steenbras area for over 10 years before the CoCT started groundwater abstraction from the Steenbras Wellfield in 2021. The MeteEAU Nappes forecasting tool is already implemented for many observation wells of the national piezometric network of France where it is used for decision-making by the French administration for measures regarding drought or flood anticipation. It combines real-time hydrological observations with a lumped model (e.g. GARDENIA) to simulate groundwater level and extrapolates observations for the following 6 months from statistical meteorological scenarios combined with abstraction scenarios. This tool can help to protect the TMGA targeted at Steenbras Wellfield as a critical source of water for the CoCT, along with ensuring continued ecological functioning of various groundwater-dependent ecosystems.