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Discussion Document for Scoping Phase

Ecological and Environmental Impacts of Large-scale Groundwater Development in the Table Mountain Group (TMG) Aquifer System. Discussion Document for Scoping Phase. Table of Contents. 1 Purpose of this document 2 An introduction to groundwater 3 Groundwater interactions in the environment

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Discussion Document for Scoping Phase

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  1. Ecological and Environmental Impacts of Large-scale Groundwater Development in the Table Mountain Group (TMG) Aquifer System Discussion Document forScoping Phase

  2. Table of Contents 1 Purpose of this document 2 An introduction to groundwater 3 Groundwater interactions in the environment 4 Assessing Groundwater Dependence 5 References 6 Glossary of hydrogeological terms

  3. Primary Aquifers: Spaces formed at the same time as the geological formation, for instance intergranular porosity in sand (e.g., alluvial deposits. Secondary Aquifers: Spaces formed after the geological formation, such as fractures in hard rock.

  4. TMG Aquifers

  5. TMG Settings

  6. Groundwater interactions in the environment Interactions with non-marine aquatic ecosystems Surface water bodies Subsurface water bodies Interactions with terrestrial ecosystems Interactions with marine ecosystems

  7. A groundwater dependent ecosystem, or component of an ecosystem, can be defined as: • ‘An ecosystem, or component of an ecosystem, that would be significantly altered by a change in the volume and/or temporal distribution of its groundwater supply’. • Furthermore • groundwater use = groundwater dependence; • groundwater use = use of TMG groundwater; • abstraction of TMG water =reduce supply to a GWDE. Groundwater dependence

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