一、水运业现状及问题(一 )可持续发展的优势条件1 四川是长江上游的重要省份 ,河川径流总量 1 377亿立方米 ,具有发展航运的丰富的水资源条件。重庆市改为直辖市后 ,全省仍拥有通航河流 6 2条 ,通航里程6 1 99公里 (含长江干线2 1 9公里 ) ,其中七级以上航道 30 0 4公里 ,通? I. Status Quo of the Water Transport Industry and Problems (I) Advantages of Sustainable Development Conditions 1 Sichuan is an important province in the upper reaches of the Yangtze River. Its total runoff amount to 137.7 billion cubic meters. It has abundant water resources for developing shipping. After the municipality was changed to a municipality directly under the Central Government, the province still had 62 navigable rivers and 6,199 kilometers of navigable miles (including the 291 km of the Yangtze River Main Line), of which 304 km were waterways above Grade VII,