Qingshitan Reservoir Environment

Gan Tang River is a mountainous river with small watersheds between valleys. The river is narrow and swift, with high source and deep valley, dense bamboo forests and good water collection conditions. In particular, Qidu River in the reservoir area is an open valley with flat terrain, thick overburden and good water storage conditions. The groundwater level in the reservoir area is higher than the normal water level of the reservoir, so there is no danger of leakage. The dam site is located at the exit of the canyon. The valley is asymmetrical U-shaped, with a width of100m and a depth of10m. The bedrock on both banks is exposed and the bank slope is steep, which is suitable for dam construction. The downstream of the dam is a large karst dissolution plain with relatively flat terrain and concentrated cultivated land, which is conducive to self-flow irrigation.

Gan Tang Jiangzhu Garden is located on the east slope of Caixi Street, 33.7 kilometers away from the dam. The reservoir controls the rainwater collection area of 474 square kilometers, and the river bed gradient is 5%, which is not greatly affected by human activities. The reservoir is located at the southern foot of Nanling Mountains in northeast Guangxi, and belongs to the rainstorm center. The annual average temperature 18.9℃, the annual average rainfall of 2400 mm, the annual average evaporation of 905.7 mm, the annual average inflow of 26.5 cubic meters per second, and the dry season flow of 3.5 cubic meters per second. The once-in-a-millennium flood flow is 4760 cubic meters per second, and the possible maximum flood flow is 9060 cubic meters per second; 19 15 The maximum flood flow is 3080 cubic meters per second, and the average annual inflow is 840 million cubic meters.