一、修建筒井的自然条件1、虽然原土井有水,但是由于水量小,不能充分利用草场载畜能力的地方.2、原有土井易被风沙洪水埋没的地方.3、没有衬砌,污染严重的土井.4、缺水草场,经调查可以挖井,从而缩小饮畜半径的地方.5、几下述诸条,地下水埋深不超过20米为宜. First, the natural conditions of the construction of wells 1, although the original wells with water, but because of the small amount of water, can not make full use of pasture carrying capacity of the place.2, the original wells are easily buried by the wind and sand flood place.3, there is no lining, serious pollution Of the soil wells 4, lack of water pastures, the investigation can dig wells, thereby reducing the radius of drinking livestock.5, a few of the following articles, groundwater depth of not more than 20 meters is appropriate.