The reason why Karez is not easy to evaporate

1, Karez does not evaporate, because Karez mainly excavates culverts, and wells are connected with each other underground. Even in very hot weather, the water in the culvert can still reach a certain amount of supply. This effectively protects the water source from evaporation.

2. Karez, which means "well point", has been recorded in historical books as early as Jingqu, and it is called "Karez" in Xinjiang Uygur language. Karez is a special irrigation system in desert area, which is widely used in Turpan, Xinjiang, China. Karez, Wan Li Great Wall and Beijing-Hangzhou Grand Canal are also called the three major ancient projects in China. The total number of karez wells in Turpan is more than 1 100, with a total length of about 5000 kilometers. Karez is a horizontal water-collecting building for exploiting and utilizing groundwater in ancient times, which is suitable for foothills and alluvial fan edges. It is mainly used for intercepting groundwater, irrigation of farmland and domestic water for residents. The structure of Karez is generally composed of four parts: shaft, underground passage, ground passage and "waterlogging dam" (small reservoir). Bogda Mountain in the north of Turpan Basin and Karawu Mountain in the west are both mountains. In spring and summer, a lot of rain and snow flow down the valley and dive under the Gobi Desert. People use the slope of the mountain to skillfully create karez, which leads underground undercurrent to irrigate farmland. Karez will not evaporate a lot of water due to high temperature and strong wind, so the flow rate is stable, ensuring self-flow irrigation.