Why not draw water from Lancang River when drawing water from central Yunnan?

It is the result of many considerations. The water diversion project in central Yunnan is a major water conservancy project implemented by China government to solve the water shortage problem in central Yunnan. Its main purpose is to divert water resources from the upper reaches of the Yangtze River to central Yunnan to meet the needs of drinking water, industrial water and agricultural water in this area. The water intake point of the water diversion project in central Yunnan is located in the upper reaches of the Yangtze River, and the Lancang River is one of the tributaries of the Yangtze River. If water is diverted from the Lancang River, it is necessary to build a water diversion pipeline across the Lancang River basin, which is of great investment cost and technical difficulty. Therefore, the government decided to divert water from the upper reaches of the Yangtze River, which is also one of the design concepts of the water diversion project in central Yunnan. In addition, the water quality in the upper reaches of the main stream of the Yangtze River is relatively good and stable, and it is suitable as a water supply source. Therefore, the selection of water diversion project in central Yunnan to guide the water resources in the upper reaches of the Yangtze River is based on various considerations.