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Ecological and Environmental Impacts of Large-Scale Groundwater Development in the TMG Aquifer

The WRC project K5/1327 focuses on understanding the ecological and environmental impacts of large-scale groundwater development in the Table Mountain Group (TMG) Aquifer System. The project aims to characterize groundwater discharge areas, assess the dependency of ecosystems on groundwater, and analyze responses to changing hydrological conditions. Key activities include innovative research approaches, monitoring, and predictive tools to enhance ecosystem resilience and inform sustainable groundwater usage. Collaborators include CSIR, Umvoto Africa, and Southern Waters.

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Ecological and Environmental Impacts of Large-Scale Groundwater Development in the TMG Aquifer

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  1. Ecological and Environmental Impacts of Large-scale Groundwater Development in the Table Mountain Group (TMG) Aquifer SystemWRC project K5/1327

  2. WRC – TMG Introduction • Objectives of the WRC Eco TMG project • Who is involved • Project process and timing • Links with CCT-TMG AA project • Differences to CCT-TMG AA project.

  3. Aims of the WRC project • Characterize the occurrence of groundwater discharge areas in the TMG; • Characterize the hydraulic continuity between discharge areas and deep and shallow aquifer flow regimes; • Characterize groundwater use by terrestrial and aquatic ecosystems; • Assess the dependency on groundwater of these uses and the sensitivity of ecosystems to changes in the groundwater regime; • Determine early indicators of stress and response to changes in the groundwater regime; • Assess the resilience of ecosystems to changing groundwater conditions at various temporal and spatial scales.

  4. Approach • Innovative and integrative research • Predictive tools and indicators • Education and research • Leverage additional funding for long term

  5. Project Overview • Scoping • Monitoring • Analysis • Recommendations

  6. The Core Team • CSIR • Paul Lochner (PL) • Christine Colvin • Dr Dave Le Maitre • Umvoto Africa • Rowena Hay • Dr Chris Hartnady • Southern Waters • Dr Cate Brown • Dr Bill Harding

  7. Themes and Teams

  8. Time Frame • Scoping – March 2002 – April 2003 • Data collation • Specialist inputs • Target sites • Monitoring - May 2003 – Sept 2004 • Analysis - March 2003 – Dec 2004 • Recommendations – March 2003 – Dec 2004 ?

  9. Overlapping areas • Team • GIS database • Research and improved understanding • Monitoring protocol • Risk assessment of GDEs

  10. Research focus Broader GDE review Scientifically inclusive Boundary conditions –climate change Focus on CCT sites Vulnerable GDEs EIA – impact minimisation Environmental flow requirements Monitoring compliance No-go limits Stakeholder process WRC – EcoTMG CCT – TMG-AA

  11. Thank you • Points for clarification…?

  12. Outputs of the CCT Eco task • Data base and maps • Consensus on monitoring protocols • Eco redflags (no-go & switch off) • Rapid and intermediate RDM • Actual monitoring and analysis • Impact minimisation – MCDA & risk

  13. CCT – TMG project • Overall objective – development of groundwater resources. • Environment 1 of 7 tasks • Task leader – Mike Luger (NS) • Core team as for WRC

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