暗管排水是改良沼泽地、盐渍地、渍害地的有效措施,近年来在我国南北方土壤改良上逐步推广应用。但暗排技术中尚需解决的问题之一是暗管清淤,因暗管排水系统施工过程中常有土壤颗粒和滤料细砂进入暗管,特别在施工期地下水位过高或遇降雨,大量泥砂淤入暗管,如不清洗,势必影响排水作用。有的地区为了避免淤积暗管,强调选择在干旱期、地下水位最低时期进行施工,这种按排往往要耽误作物播种和影响其它农事作业,尤其多雨的南方地 Underground pipe drainage is an effective measure to improve marshland, saline land and soil damage. In recent years, it has been gradually popularized and applied in soil improvement in both north and south of our country. However, one of the problems to be solved in the technology of concealed drainage is that of underground pipe dredging. Because of the soil particles and fine sand of the filter material often enter the underground pipe during the construction of the concealed pipe drainage system, especially when the groundwater level is too high or rain during the construction period, A large number of silt silt into the dark tube, if not cleaned, is bound to affect drainage. In some areas, in order to avoid the siltation of underground pipelines, it is emphasized that the construction should be carried out during the dry period and the lowest groundwater level. Such arrangements often delay the sowing of crops and affect other agricultural operations, especially in the wet southern areas