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西藏是中国与亚洲大江大河河源集中区,河流与湖泊众多,水资源丰富。1999年水资源总量为4548.4亿m~3,占全国水资源总量的16.1%。西藏水资源多集中于几条主要的大江大河之上,因地处上游,开发难度较大、利用率较低。1999年全区供水量为25.81亿m~3,仅占水资源总量的0.57%。其次,河川径流的年际变化较大,大中河流最大与最小年径流量之比介于1.9—4.0,中小河流则远大于此数。第三,年内分布不均。河川径流多集中于每年6—9月的汛期,径流量约占全年的50%～80%。经过近四十年的努力,西藏水利事业取得了极为可喜的成绩,在促进社会经济稳定
Tibet is a concentrated area of Heyuan, a major river in China and Asia. There are many rivers and lakes and abundant water resources. In 1999, the total amount of water resources was 454.84 billion m 3, accounting for 16.1% of the total amount of water resources in the country. Water resources in Tibet are mostly concentrated on several major rivers. Due to their location in the upper reaches, Tibet is more difficult to develop and has a lower utilization rate. In 1999, the water supply in the entire district was 2.581 billion m 3, accounting for only 0.57% of the total water resources. Second, the inter-annual variation of river runoff is larger. The ratio between the maximum and minimum annual runoffs of large and medium-sized rivers ranges from 1.9 to 4.0 while that of middle and small rivers is far greater than this. Third, uneven distribution during the year. River runoff and more concentrated in the annual September-September flood season, runoff accounts for about 50% to 80% of the year. After nearly 40 years of hard work, the water conservancy project in Tibet has made extremely gratifying achievements in promoting social and economic stability