Reservoir characteristics of Liang Shi River Reservoir

The reservoir area is located in the semi-humid temperate monsoon climate zone, with an annual average temperature of 13.2 ~ 14 degrees Celsius and an annual average precipitation of 883.2 mm, accounting for 72% of the annual rainfall from June to September. The annual evaporation in the reservoir area is 1570 ~ 1780mm, which is nearly 230mm in May and June. The location of the reservoir area belongs to the sloping plain area of erosion and accumulation in front of Yimeng Mountain, and the terrain is relatively flat.

The dam elevation of Liang Shi River Reservoir is10.0 ~14.0m.. The runoff in the reservoir basin is replenished by atmospheric precipitation, and the annual runoff depth is 200 ~ 300mm. Yimeng Mountain is located in the upper reaches of Yishu reservoir control area, with serious soil erosion. The annual average sediment concentration at Linyi Station in yi river is 3. 10kg/m3, and the annual average sediment transport rate is 246kg/s. The annual average sediment concentration at Juxian Station of Shuhe River is 3.93kg/m3, and the annual average sediment transport rate is 62kg. 1983 12 The measured siltation in the reservoir area is 54 million cubic meters.

The limited water level of the reservoir in flood season is 23.5 meters, and the water level after flood season is 24.5 meters; The design flood level of the reservoir is 26.8 1 m with a return period of 100, and the check flood level is 27.95 m with a return period of 2000.

The highest flood level is 26.82m, August 1984, the lowest level15.24m, and July 9 1965.

In 2005, the highest storage capacity was 349 1.7 million cubic meters, and the lowest storage capacity was 1.992, 4.78 million cubic meters.

1 0,998, and the maximum flood discharge is 1 236,036,200 cubic meters.

The maximum flow in 2000 was 2500 cubic meters per second.