Main tributaries of Mengjiang River

In the Tengxian section, there are 3 first-class tributaries with a drainage area of ??more than 50 square kilometers: Datong, Pingfu and Mahe; 12 first-class tributaries with a drainage area of ??10-49 square kilometers: Dubo and Siming , Zuodong, Gude, Huangdong, Guxiu, Yangdong, Junchang, Luodong, Jintuan, Dadai, Shangxia River; 5 first-class tributaries with an area of ??5 to 9 square kilometers: Liuleluoche, Zhou Chong, Fuchuan, Hengqiao, Xiangbi River.

The Datong River originates from Genguang Village, Zhongliang Township, Jinxiu County, flows through the northern part of Pingnan, enters from Huan Village, Dongrong Township, and merges into the Mengjiang River at Sanjiang. The total length is 103 kilometers and the drainage area is 1124 square kilometers. The average annual runoff is 1.010 billion cubic meters. Normal base flow is 5.23 cubic meters per second. The territory is 10.75 kilometers long, with an average specific drop of 0.65‰ and a natural drop of 7 meters. The theoretical water energy reserve is 0.25 million kilowatts, and 0.16 million kilowatts can be developed: there were 16 drum cars before the 1950s. In 1965, the Hongqi and Liuhe water pumping stations were built. The comprehensive power generation installed capacity of Hongqi Pumping Station is 75 kilowatts. The rivers within the territory merge into three Datong rivers in the Pingnan section outside the country, with a basin area of ??more than 50 square kilometers: Dali, Guchang, and Ningkang rivers; the Lishi River with an area of ??10 to 49 square kilometers and the Lechong River that merges into the territory.

Liuli River, also known as Pingfu River and Lezhu River, originates from Taohua Village, Pingfu Township, in the county. It flows into the Mengjiang River at the mouth of Taiping Town River. The total length is 49.50 kilometers, the drainage area is 560.70 square kilometers, and the average annual runoff is 355.96 million cubic meters. Normal base flow is 2.57 cubic meters per second. The average drop is 8.28‰, the natural drop is 410 meters, and the usable height is 118 meters. The theoretical reserves of water energy are 23,500 kilowatts. It can develop 0.57 million kilowatts. The tributaries with a basin area of ??more than 50 square kilometers include Daren and Mosi rivers, and Qizheng, Quancun, Gaotan, Naliang, Fule and Xuncun rivers with a basin area of ??10 to 49 square kilometers. Before the 1950s, they were mostly used for shipping and water lifting by drum trucks for irrigation. After the 1960s, Binh Phuoc Commune installed more than 80 water wheel pumps in the upper reaches and its tributaries. Taiping Commune built five water wheel pump dams in the lower reaches: Daya, Shuizhai, Xiaxia, Gaoche and Dapo. In the 1970s, the Pingfu Hydropower Station and the county's largest water diversion project were built upstream, and the Mashan Hydropower Station was built using channels to reduce water flow, with an installed capacity of 1,240 kilowatts.

Ma River was called Niupi River in ancient times. It originates from Tianxin Village, Gulong Town, and merges into the Mengjiang River at Shizui, Jiang Town. It is 48.90 kilometers long and has a drainage area of ??186 square kilometers. The average annual runoff volume is 119.04 million cubic meters. Normal base flow is 0.37 cubic meters per second. The average specific drop is 2.95‰, the natural drop is 144 meters, and the usable power is 80 meters. The theoretical water energy reserve is 0.20 million kilowatts, and the development capacity is 0.05 million kilowatts. The basin area is 10 to 49 square kilometers. The tributaries include Enyuan, Pingshan, Yihe, and De'an Rivers. Before the 1950s, it was mainly used for shipping (downstream) and water pumping by bobbin trucks for irrigation. In the 1960s, water wheel pumping stations were built, including Anhe, Licun, Bingzhou, Fozi, Longteng, Shuili, Shuangtou, Chashan and Shuangtou. Che, Wangsi, Duzhou, Guwan, Horseshoe, Chetian, Shihuatai, Shimen, Dongxian, Huangyang, Shiniuxia, Fengcun, Xuejing, Xinrong, Helong, Yaotian, Huilong, Xiakou There are 30 mortar stone dams in Dashi, Gudong, Baihu and Niubei to divert and pump water for irrigation, and small (1)-type Dujiu and Dalu reservoirs were built at the Gulong and Gulong rivers respectively.

In the Mengshan County section, the Chashan River is located in the northern part of the county. It originates from Xingping Township, Lipu County, enters from the east side of the Gaoling in Changping Township, and runs through Changping Township from north to south. Gaoduidongkou in Shanzhen merges with the Renshan River and then flows into the Meijiang River. The county has a flow of 28.5 kilometers, a drainage area of ??130 square kilometers, a drop of 208.6 meters, and an average drop of 7.34‰. In 1989, the runoff volume was 87.7 million cubic meters, the average flow rate was 3.8 cubic meters/second, and the water energy reserve was 5778 kilowatts, which is available for development. With a capacity of 5,200 kilowatts and a developed capacity of 3,200 kilowatts, it is the only long-term water source of Chashan Reservoir, the largest reservoir in Mengshan County.

The Xiayi River is the main river in the southwest of the county. It originates from Jinxiu Yao Autonomous County. It enters the western end of Xiayi Township, flows through Xiayi, Wenwei, Xihe and other townships, and merges into the south side of Longpan in Xihe Township. Mekong River. The process inside the county is 47.2 kilometers, and the process outside the county is 3.9 kilometers. The basin area is 305.8 square kilometers, with a natural drop of 31.4 meters.

In 1989, the runoff volume was 214 million cubic meters, with an average flow rate of 6.78 cubic meters/second. In the Xiayijing river section, the average ratio dropped by 9.4‰. The river bed is steep and the water is fierce during floods. The water energy reserve is 3192 kilowatts and the available development capacity is 2878 kilowatts. The average ratio of the Wenweijing river section is 1.5‰, the water energy reserve is 2088 kilowatts, and the available development capacity is 1462 kilowatts. The main water conservancy and hydropower facilities along the river include: Xiayi Power Station, Wenwei Power Station, Shuangtun Water Conservancy Dam, Baihan Water Conservancy Dam, and Wenlong Dam.

The Wachong River originates from Wachong Village, flows through Wachong, Datang, Wen'er, Gulou, Leyong and other villages in Xihe Township, and merges into the Meijiang River on the south side of Leyong. It is 22.16 kilometers long, with a basin area of ??71.5 square kilometers, a natural drop of 680.30 meters, and an average drop of 30.7‰. In 1989, the runoff volume was 56 million cubic meters, the average flow rate was 2.2 cubic meters/second, the water energy reserve was 11,945 kilowatts, the available development capacity was 5,974 kilowatts, and the developed capacity was 200 kilowatts. It is the main long-term water source of Wachong Reservoir.

The Baihe River is formed by the confluence of the Qingjiang, Pingyuanjiang, and Daochongjiang rivers (the Daochongjiang River originates in Huangcun Township, the Qingjiang River originates in Wachong County, Xihe Township, and the Pingyuanjiang River originates in Zhaoping County). The mouth of the river near Jue Village Hall merges into the Meijiang River. The process outside the county is 4 kilometers, and the process within the county is 24.67 kilometers. The watershed area is 120.5 square kilometers, with a natural drop of 88.8 meters, and an average drop of 3.6‰. In 1989, the runoff volume was 100 million cubic meters, the average flow rate was 4.4 cubic meters/second, the water energy reserve was 2761 kilowatts, the available development capacity was 1933 kilowatts, and the developed capacity (Lily River Section) was 50 kilowatts.

The Xiaoshuichong River is joined by the Dache, Jindong, Shaling, and Guma rivers. Except for the Guma River, which originates outside Zhaoping County, they all originate from Hanhao Township and Chentang Town in the county. It merges into the Meijiang River on the west side of Chentangwei. The flow outside the county is 15.9 kilometers, and the flow inside the county is 40 kilometers. The drainage area is 166 square kilometers, with a natural drop of 108.8 meters. The average drop is 9.8‰, and the annual runoff is 110 million cubic meters. In 1989, the average flow rate was 4.97 cubic meters/second, the water energy reserve was 595 kilowatts, the available development capacity was 536 kilowatts, and the developed capacity was 255 kilowatts. It is the only long-term water source of Chentang Town Hydropower Station.