最近二十多年,西德在农田排水系统中普遍采用了塑料排水管,并进一步改善了塑料管的水力特性。为了掌握管材性能的稳定性,在西德水和农业工程协会排水委员会的倡议下对埋设的塑料排水管先后进行了三次研究。第一次是在1964～1966年,主要研究用聚氯乙烯和聚乙烯制成的光滑排水管。这个时期埋设的排水管规格不统一,形状、直径以及进水孔的分布各不相同,管材的稳定性也不佳。 In the recent two decades, West Germany has widely adopted plastic drainage pipes in farmland drainage systems and further improved the hydraulic characteristics of plastic pipes. In order to grasp the stability of the pipe performance, under the initiative of the West German Water and Agricultural Engineering Association drainage committee on the buried plastic drain pipe has conducted three studies. The first was in 1964 ~ 1966, the main study made of polyvinyl chloride and polyethylene smooth drain. Drainage pipe laid at this period is not uniform size, shape, diameter and distribution of water holes vary, the stability of the pipe is not good.