Gordon River Dam provides water for hydroelectric power in southwestern Tasmania, Australia. This arch dam across the Gordon River is 460 feet (140 meters) high and has a capacity of over 9.2 million acre-feet (11.3 billion cubic meters) of water. An acre-foot equals the volume of a square container that is 1 foot (0.3 meter) high and has a base of 1 acre (0.4 hectare) in area.