Battle over Wyangala Dam and its downstream impacts is just beginning We’re sorry, this service is currently unavailable. Please try again later. Dismiss Normal text size Very large text size On a summer’s evening, as the setting sun paints a flock of straw-necked ibises a glowing pink as they wing their way over Lake Cowal, it’s not hard to imagine Mal Carnegie has landed a dream job. As manager of a conservation centre monitoring NSW’s largest inland natural freshwater lake, the 56-year old gets to introduce visitors to one of Australia’s greatest “boom-bust” wildlife systems that has thrilled him all his life.