According to the analysis and calculation of the data of Wen Er Station of Ganxi River in Hengdong County for many years, the average monthly water level in Shui Gu for many years is between 47 and 50 meters; The annual average runoff is 7.603 billion cubic meters; The average sediment concentration for many years is 0. 13 1 kg/m3.
There are three dams in Hengdong County, namely, Ronghuan, Ganxi and Tang Yang, which make the river channel 200-300 meters wide, the water flow is stable, and the benefits of irrigation and power generation are also collected. The river is navigable all year round: 5~20 tons of cargo ships can be navigable above Yanglin; Yanglin to Tang Yang can receive 10~30 tons cargo ship; Under Tang Yang, cargo ships of 5-25 tons can pass through. Yongle River is its largest tributary.
The four consecutive months (March-June) with the largest annual average runoff account for 58.5% of the annual runoff, and the smallest three months (July-September) only account for 20%. In the 24 years measured in the last century, the maximum annual runoff was 65.438+02.033 billion cubic meters (65.438+0970), in seven years it was more than 9.5 billion cubic meters, accounting for 2.965.438+06%, and the minimum runoff was 2.839 billion cubic meters (65.438+0963), and in nine years it was less than 6.5 billion cubic meters.
The maximum sediment concentration is 3.47kg/m3 and the minimum sediment concentration is 0.003kg/m3. The annual sediment transport rate is the largest in flood season. Due to serious soil erosion, the Wangriyan River Dam built in the upper reaches of Shui Gu in 1972, 198 1 year, and the average sedimentation at the upper end of the dam 1. 1 m, the ship lock cannot be navigable. Five years after 1977, dredging 3 19.