Ecological Use of Groundwater Christine Colvin Environmentek, CSIR, South Africa IAH.

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Presentation transcript:

Ecological Use of Groundwater Christine Colvin Environmentek, CSIR, South Africa IAH

Springs Seeps Baseflow to rivers and wetlands Stream

Groundwater also supports.. Submarine springs Life underground Evapotranspiration from trees

Environmental Impacts Pumping reduces discharge Groundwater pathways for pollution

Understanding Dependency Groundwater Dependent Ecosystems Vital characteristics Quantity of water Quality of water Timing of water

Aquifers moderate water supply to the environment… Aquifer Storage Biogeochemical processes Aquifers sustain environmental services & livelihoods

Competition with people…. Who can dig deepest & fastest? Balance people’s needs for water and the environment.

Science to understand the full picture

Understand vital links… Remote sensing Isotopes Nutrient and water modelling rain GW flushing

Understand consequences of actions.. Optimal beneficial use Impacts of abstractions Stakeholder trade-offs Informed decisions

Urgent action required to.. Recognise groundwater dependent ecosystems Start understanding links Monitor ecological health Seek informed decisions Allocate groundwater to the environment