South African Estuary Information System – Reserve determination studies for selected surface water, groundwater, estuaries and wetlands in the Outeniqua (Groot Brak and other water resources, excluding wetlands) catchment: Ecological Water Requirements studies - Estuarine RDM Report: Groot Brak Assessment. Report RDM/ K10 - K30: K40E/00/CON/0307, Pretoria.