澳大利亚是世界上最干燥的大陆,降水量最少(全境年平均降水仅有455mm),约有三分之二的国土属于干旱或半干旱地带,几乎整个澳大利亚都经常受到干旱的威胁。同时,持续的城市化使得城市中的道路和建筑日益密集,破坏了城市自然水循环的平衡和持续。另外,传统的雨洪管理模式旨在将雨水快速收集并排走,暴雨径流的大流量、高峰值超出了城市排水设施的排水能力,导致了城市洪水、内涝频发。澳大利亚联邦政府于20世纪80年代开始就持续对水行 Australia is the driest continent in the world with the fewest rainfalls (annual average precipitation is only 455mm) and about two thirds of the territory is in arid or semi-arid zones, with almost all of Australia under constant drought threat. At the same time, continued urbanization has led to increasingly dense roads and buildings in cities, undermining the balance and sustainability of urban natural water cycles. In addition, the traditional stormwater management mode is designed to collect and drain rainwater rapidly. The large flow and peak of stormwater runoff exceed the drainage capacity of urban drainage facilities, resulting in frequent urban floods and frequent floods. The federal government in Australia continued to operate on water since the 1980s