subdrainage meaning in Chinese

暗沟排水
地下排水沟
地下排水设备

Pvc subdrainage is one kind of advanced drainage techniques developed in recent years in the world . it will have a promising future of wide application
塑料暗管是一种新型的排水材料，具有很好的排水效果，应用前景广阔。
The pavement subdrainage system removes excessive subsurface water to the edge of highway in time , so it can improve pavement performance and extend service life . asphalt treated permeable base ( atpb ) material has been widely used due to its high drainability and construction convenience
如果在路面内部设置排水系统，将路面结构中的内部滞水及时排除到路面和路基结构外，可以改善路面的使用性能，提高其使用寿命。
Based on this , the upper controlling index of soil water content is 80 . 4 % and the days of waterlogged and salinization tolerance is 3 . 2 days . the moisture and salinization movement mathematical model in the field under subdrainage condition is based on the assumption of neglecting the effects of horizontal hydraulic gradient , it can analogy the changes of soil water content and salinization which are changed with times and depth
论文在忽略水平方向水力梯度影响的假定下建立了排水条件下麦田水盐运移模型，模拟土壤水盐含量随时间、空间的变化情况。经与实测资料对比发现，计算值与实测值较为接近，故该模型及参数的确定是合理的，可用于预测麦田水盐的动态变化。