But the development of pollution in these waters has produced a number of problems.
River pollution is directly related to the existing conditions of pollution sources in the region.
The proposed trunk conveyance canal would receive pesticides and fertilizers from the Huai He and Hai He drainage basins. These would be certain to affect the quality of transferred water. The current water quality conditions in several major rivers are as follows. At present the water quality of the Chang Jiang is good. The water has a pH value of 7.0 to 8.5 and a total hardness of 4 to 9 degrees.