What is the state of rivers in Fujian?

Fujian has a dense river network, and most rivers originate in the mountainous areas of the province. The main tributaries are parallel or vertical to the mountain, forming a lattice water system. The total length of rivers in China is about 1.3 thousand kilometers, and the density of river network exceeds 0. 1 kilometer per square kilometer. Compared with 2002, the overall water quality of rivers in the province declined slightly, and the pollution was mainly concentrated in the urban transit reach and the sewage outlet reach of factories and mines. From north to south, the pollution of Minjiang River is mainly distributed in Shaxi and the lower reaches of Minjiang River, and the main over-standard items are ammonia nitrogen; The water quality of Jiulong River system has obviously decreased, and the pollution is mainly distributed in Dongxing-Zhangping reach of Longyan and Xixi Bridge Gate and Shima in Zhangzhou City. The main items exceeding the standard are ammonia nitrogen and permanganate. The water quality of Tingjiang River system has obviously decreased, and the pollution is mainly distributed in Guanyin Bridge in Changting and Yangjiafang reach in Liancheng, and the main over-standard items are ammonia nitrogen. The water quality of Jinjiang River system is declining, and the pollution is mainly distributed in Yongchun Chengguan and Nan 'an Honglai reach, and the main over-standard items are ammonia nitrogen. The water quality of the rivers in eastern Fujian is declining, and the pollution is mainly distributed in Zhouning Chengguan and Fuan Tiehu, as well as Jiaocheng Donghutang reach. The main items exceeding the standard are ammonia nitrogen and five-day biochemical oxygen demand. The water quality of Mulan River system is quite good, and the pollution is mainly distributed in Xianyou Chengguan and Hanjiang reach. The main items exceeding the standard are ammonia nitrogen, dissolved oxygen, permanganate and five-day biochemical oxygen demand. The main rivers in Fujian are Jiaoxi, Huotongxi, Minjiang, Jinjiang and Jiulong River from north to south. Among them, Minjiang River is the largest river in the province, with a total length of about 577 kilometers; The basin area is about 6 1 000 square kilometers, accounting for about one and a half of the basin area of the whole province. There are Jianxi, Futunxi and Shaxi in the upper reaches, all of which originate from Wuyishan, and meet near Nanping to form Minjiang River, which flows into the East China Sea in two ways east of Fuzhou. Jiulong River is a big river in the south with a main stream of about 258 kilometers long. Rivers are rich in water, with small sediment concentration and many dangerous beaches. Although sailing is inconvenient, they are suitable for generating electricity. The reserve of hydraulic resources is about 10.5 million kilowatts, ranking first among the provinces in East China.