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 volume 3: Maalgate, Gwaing, Kaaimans and Noetsie Assessment. Report RDM/ K40 - K50/00/CON/0307 volume 3, Pretoria.