Warragamba Dam is the largest concrete dam in Australia and one of the largest domestic water supply dams in the world. Lake Burragorang, which is formed behind Warragamba Dam, is around four times the size of Sydney Harbour. To build the dam, three million tonnes of concrete were placed across the Warragamba River in a series of large, interlocking blocks. The dam grounds reopened to the public in 2009 after a 10-year closure for major dam upgrades. The grounds include a new visitor centre, Water for Life exhibition, viewing platforms and upgraded visitor facilities. Facilities include picnic shelters, electric barbecues, drinking water, toilets, disabled toilets and viewing areas. No wood, charcoal or solid fuel barbecues can be used. Portable gas barbecues are permitted except during total fire bans.