Цяньтан
Overall, the runoff of Qiantang River is abundant. However, the incoming water of Qiantang River is strongly impacted by seasonal variation. In general, the runoff from April to June can occupy about 50% of the total annual flow. Because Qiantang River valley is located in the southeast coastal monsoon climate zone, the main source of runoff is atmospheric precipitation. The runoff and precipitation in Qiantang river valley show obvious consistency in both regional distribution and annual variation. The average annual discharge is 2.905×1010 cubic meters, and the average annual sediment discharge is 6.68×10^6 tons. In addition, the annual runoff of the Qiantang River and its tributaries showed significant changes in abundance and drought.