Influence of Flow Rate and Water Quality of Shayinghe River on Water Quality in Huaihe River

The Shayinghe River is the largest tributary of the Huaihe River. Its discharge of wastewater and that of COD Cr account for more than 40% respectively of the total pollutants received by the mainstream of the Huaihe River. Since 1989,five serious pollution accidents have occured in the Huaihe River Basin, all of which are related to the Shayinghe River. Based on the comprehensive analysis of water quality and quantity before and after the discharge of wastewater from the Shayinghe River to the Huaihe River for the five pollution accidents, the causes of the pollution accidents are explained, the regularity of the Huaihe River pollution caused by the Shayinghe River is found out and the relationship between the Huaihe River pollution and water quantity and water quality is shown. The results may help adjust the operation of water gates on the Shayinghe River and the Huaihe River to prevent pollution accidents in the Huaihe River.