Volwaterbaai Desalination Plant

Dispersion modelling
Specialist Input to EIA Study
PRDW was appointed by Sedex Desalination (Pty) Ltd and SRK Consulting (South Africa) Pty Ltd to model the dispersion of brine discharged from a desalination plant at Volwaterbaai on the Northern Cape coast of South Africa. The study was used as a specialist input to the Environmental Impact Assessment and was undertaken to inform the identification and assessment of impacts by Marine and Coastal Ecology Specialists.
South Africa, Northern Cape, Volwaterbaai

current circulation in this area.

The baseline coastal processes including waves, currents and tidal water levels at Volwaterbaai were described using available data and numerical modelling.

The dispersion of the brine and co-discharges was modelled under a set of 46 environmental scenarios chosen to represent the characteristics of the discharge site. Taking into account the probability of occurrence of each scenario, the model results were combined to produce a statistical result indicating the distance from the discharge point at which the water quality guideline is met, as well as the number of dilutions for co-discharges.

The results of this study will be interpreted by the Marine Ecology Specialist which will inform the associated impacts and the possible need for mitigation measures.

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