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筒井是牧区的主要供水工程之一。仅内蒙古自治区就有7万多眼筒井。由筒井解决的人畜供水占牧区人畜供水的50%以上。但是这为数众多、在牧区人畜供水中起主要作用的筒井,绝大多数无防冻设施,在冬春季节常常因封冻而无法使用。牧民不得不破冰取水,牲畜只得靠食雪解渴。如遇黑灾年份(冬春无雪),大批牲畜因无雪无水食用,寒冷、干渴而亡,造成很大经济损失。仅1968、1976年两次特大黑灾,
Drilling wells is one of the major water supply projects in pastoral areas. Only Inner Mongolia Autonomous Region there are more than 70,000 eye canal. The water supply for livestock and poultry solved by the silo covers more than 50% of the water supply for livestock and livestock in the pastoral areas. However, this large number of wells, which play a major role in the supply of water for livestock and poultry in pastoral areas, are mostly unfreeze-free and can not be used for freezing during winter and spring. Herdsmen had to break ice and take water, and livestock had to quench their thirst by eating snow. In case of the black-storm years (winter and spring without snow), a large number of livestock died of snow and dry water, causing great economic losses. Only 1968, 1976 two major black disaster,