Sichuan has heavy rainfall, and its water resources are among the richest in the country. The average annual precipitation is 488.975 billion cubic meters. The richest water resources of Sichuan are rivers and streams. Sichuan is well known as “thousand-river province”, for it boasts nearly 1,400 rivers and streams large and small. The total volume of Sichuan’s water resources approximates 348.97 billion cubic meters. In addition, there are 54.69 billion cubic meters of underground water resources, with the exploitable amount of 11.5 billion cubic meters. Sichuan is covered with over 1,000 lakes and more than 200 glaciers. There are also swamps of a considerable area, most of which spread in northwest and southwest Sichuan. The total water storage capacity of lakes is about 1.5 billion cubic meters. Plus that of marshes, the total amounts to about 3.5 billion cubic meters.