Component elements Karez system is a very delicate irrigation system made up of vertical wells, underground canals,above-ground canals and small reservoirs.Generally,a karez is 3 kilometers (1.9 miles)with the longest being 20 to 30 kilometers (12- 19 miles)with several dozen vertical wells.Sometimes the number of vertical wells exceeds 300.Until today,the shortest karez found is only 30 meters (9 feet)long. The features of its component elements ·The vertical wells The vertical wells are for ventilation.digging and maintenance of the karez. The bottoms of all the vertical wells are connected so that water can pass through. The underground canal The underground canal is about 2 meters (6.5 feet)high and covered with earth to resist the heat. ·The above The above-grou gcaaconmeedotheundegonn ound canals s,are not more than 1 meter (3.2 feet)wide with trees planted on both sides to prevent evaporation. The cooperation of its component elements Melting snow from the Tianshan Mountains is the water source of the karez. Water is collected by vertical wells and conducted by the unde the s,where the water is held in the rground canals to vertical wells near the water source may be 100 meters(328 feet)deep while further downstream they are less than 10 meters (32.8 feet)deep. The advantage ou spaau pue pemod Bumas splone uond from high ing to gravity a The water in the Karez will not dry up even in a longtime drought.A karez system helps to ideally solve this problem. Air conditioning function Karez system also functions as the natural air conditioner for the locals because they can sit in or hile ch 00 some chores When exha usted the scorching weather,sit in a karez,pick some grapes as they hang over the vertical wells and savor their taste. Enjoy it Component elements Karez system is a very delicate irrigation system made up of vertical wells, underground canals, above-ground canals and small reservoirs. Generally, a karez is 3 kilometers (1.9 miles) with the longest being 20 to 30 kilometers (12 - 19 miles) with several dozen vertical wells. Sometimes the number of vertical wells exceeds 300. Until today, the shortest karez found is only 30 meters (98 feet) long. The features of its component elements • The vertical wells The vertical wells are for ventilation, digging and maintenance of the karez. The bottoms of all the vertical wells are connected so that water can pass through. • The underground canal The underground canal is about 2 meters (6.5 feet) high and covered with earth to resist the heat. • The above-ground canals The above-ground canals, connected to the underground ones, are not more than 1 meter (3.2 feet) wide with trees planted on both sides to prevent evaporation. The cooperation of its component elements Melting snow from the Tianshan Mountains is the water source of the karez. Water is collected by vertical wells and conducted by the underground canals to the oasis, where the water is held in the above-ground canals for irrigation. The vertical wells near the water source may be 100 meters (328 feet) deep while further downstream they are less than 10 meters (32.8 feet) deep. The advantage A karez reduces evaporation, avoids getting polluted and needs no other power equipment; it runs from high to low ground owing to gravity alone. Turban is the hottest place in China and the arid climate makes water all the more precious. The water in the Karez will not dry up even in a longtime drought. A karez system helps to ideally solve this problem. Air conditioning function Karez system also functions as the natural air conditioner for the locals because they can sit in one while chatting or doing some chores. When exhausted during the scorching weather, sit in a karez, pick some grapes as they hang over the vertical wells and savor their taste. Enjoy it