长江水系中，长江支流流域面积1万平方公里以上的支流有49条，主要有嘉陵江、汉水，岷江、雅砻江、湘江、沅江、乌江、赣江、资水和沱江。总长1000公里以上的支流有汉江、嘉陵江。雅砻江、沅江和乌江；流域面积5万平方公里的支流为嘉陵江、汉江、岷江、雅砻江、湘江、沅江、乌江和赣江；年平均径流量超过500亿立方米的有岷江、湘江、嘉陵江、沅江、赣江、雅砻江、汉江和乌江。
它也属于长江水系，长年多雨。
The city has many rivers, belonging to the Yangtze River system.
结果表明，各核素均未对长江造成污染，长江水系放射性浓度仍在本底水平。
The results showed that the radioactivity levels of each nuclide in Yangtze River water system were still lower than that of background, and did not cause contamination.
结果表明，各核素均未对长江造成污染，长江水系放射性浓度仍在本底水平。
The results showed that the raioac-tivity levels of each nuclide in Yangtze River water system were still lower than that of background, and did not cause contamination.
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