well tube filter 井管滤管 ; 井过滤器
The determination of diameter and length of tube well filter is always a problem not being completely solved for a long time in tube well engineering from theoretical and practical point of view.
长期以来，管井过滤器直径和长度确定一直是管井工程未完全解决的理论和实践课题，迄今，有关规定不同，存在学术见解分歧，也存在诸多值得讨论的问题。
Thus the utility model is suitable for being used as the filter tube of the well, which ensures the normal use of the well.
因而本实用新型适合于作为水井滤水管，保证水井的正常使用。
The design of infiltration ditch contains the obtaining water tube, anti-filter layer, well, pump house and other accessory building.
渗渠工程设计主要包括水平集水管、反滤层、导水管、集水井、泵房和其他附属构筑物等。
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