West Lake
Hydrological characteristics

The outline of the lake body of the West Lake is almost oval, the bottom of the lake is relatively flat. The catchment area of the west lake is 21.22 square kilometers, with annual runoff of 14 million cubic meters and storage of nearly 14 million cubic meters. The west lake draws water from the Qiantang River, about 120 million cubic meters per year. The natural surface water sources of the lake are Jinsha stream(金沙涧), long hong stream(龙泓涧), Qishan stream (huiyin stream)(赤山涧（慧因涧）) and changqiao stream(长桥溪).

The storage capacity is about 14.294 million cubic meters. The average depth of the lake is 2.27 meters, with the deepest being about 5 meters and the shallowest being less than 1 meter. The average annual precipitation on the lake is 5.629 million cubic meters. The scour coefficient of the water system is 1.49. When the gate of the reservoir is closed in a dry season, the flow rate is equal to 0. Even in the flood period, the general flow rate is only below 0.05 m/s.

The water level of the lake is maintained at the yellow sea level of 7.15 meters, ±0.05 meters. The highest water level of 7.70 meters and the lowest water level of 6.92 meters, with a difference of 50 centimeters.
change_case:capital_word_frequency[5]