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加拿大素以国土面积大、人口少、水资源丰富而著称于世。全国平均年降雨量为790mm,人均年降水占有量344,000立方米,居世界第一位,是世界人均年降雨量(28300方)的12倍多。北美五大湖是世界上最大的水系,除密执安湖属于美国外,其余为美国与加拿大共有,总面积为24万平方公里的水域,美国占72％,加拿大占28％。为了解决五大湖水源污染和生态系统变化问题,美加两国早在1909年1月就签订了国境水域条约,并成立了行政机
Canada is known for its large land area, small population and rich water resources. The national average annual rainfall is 790mm, and the annual per capita precipitation is 344,000 cubic meters, ranking the first in the world, more than 12 times of annual per capita rainfall in the world (28,300 square meters). The Great Lakes of North America is the largest water system in the world. Apart from the Lake Michigan belonging to the United States, the rest is a total of 240,000 square kilometers of waters shared by the United States and Canada. The United States accounts for 72% of the total, and Canada 28%. In order to solve the problem of water pollution and ecosystem change in the Great Lakes, the United States and Canada signed the Treaty of Frontier Waters as early as January 1909 and set up the administrative machine