What are some ways in which the chang jiang influences human system in china

The flow of the Chang Jiang is some 20 times greater than that of the Huang He. As much of 40% of China's total grain production, 70% of rice output, and more than 40% of the population are associated with the Chang Jiang's vast basin that includes more than 3,000 tributaries. With its numerous tributaries, the Chang Jiang drains nearly 20% of China's total area. Its upper reaches tap the uplands of the Tibetan Plateau before sweeping across the enormous and agriculturally productive Sichuan Basin that supports nearly 10% of China's total population. It is in the middle course of the Chang Jiang that the controversial Three Gorges Dam is being constructed.

People tend to live near river. So many humans live near there. yay