农田地下排水试验目的不同,其试验布置、试验观测内容、测试方法及要求也不一样。田间地下排水试验主要有排水管道功能试验与排水系统试验两种,前者主要研究不同排水管材、不同外包或滤层覆盖材料对排水管道水力性能的影响,研究暗管使用寿命,研究长期运用中管材质地及过滤性能的变化等问题;后者则是研究适合于试验地区自然条件、农业耕作条件以及经济条件的排水系统规划设计问题。实际上,这两方面的研究 The purpose of farmland drainage test is different, the test layout, test observations, test methods and requirements are not the same. The underground drainage test in the field mainly includes two tests of drainage pipe function test and drainage system test. The former mainly studies the influence of different drainage pipes, different outsourcing or filter covering materials on the hydraulic performance of drainage pipe, studies the life of the pipe, studies the long-term use of the pipe Texture and filtration performance changes and other issues; the latter is to study the natural conditions in the pilot area, agricultural farming conditions and economic conditions of the drainage system planning and design issues. In fact, these two aspects of research