Guanfanggou reservoir. The drinking water source of Nanjiang Chi Chang is Guanfanggou Reservoir. After the expansion of Guanfanggou Reservoir, the local water use conditions have been greatly improved. Nanjiang County built a water diversion pipe gallery from Kongmu River in Shibaitan, and introduced the water source of Shibaitan into Chi Chang, which fundamentally solved the draft problem and water quality problem of Chi Chang.