An unnamed winter brook originates from springs on the hillside in the lower northern corner of the area formerly known as McCarthy's bald patch, flowing down a shallow gully in the public open space alongside and above Chateau Court. Originally the gully took a broader profile in the present-day vicinity of Chateau Court and was filled in where the Richon Vineyard cellars were constructed (flows having been diverted around the southern side of the cellar building). The stream is not discernible west of the South Western Highway.