我国是一个水资源十分缺乏的国家。全国有50％以上面积属于干旱或半干旱地区。建国以来随着人口的不断增加，工农业生产迅速发展、对水的需求量日益增大。可是河流湖泊不断遭受污染，加之不合理的用水。使原本不足的水资源雪上加霜。造成夏季和用水高峰时期，许多地区和部门避 Our country is a country that lacks water resources. Over 50% of the country belongs to the arid or semi-arid areas. Since the founding of the People’s Republic of China, with the continuous increase of population, the rapid development of industrial and agricultural production has increased the demand for water. However, rivers and lakes continue to suffer pollution, combined with irrational use of water. So that the original lack of water worse. Caused by summer and water peak, many regions and departments to avoid