A net-shaped small hole is arranged on the seepage plate, and a longitudinaldrainage groove and a groove which is vertically communicated with the drainage groove are arranged on the guided plate.
渗水板上设置 有网状小孔，疏导板上设置有纵向的排水凹槽和与排水凹槽相垂直的连通凹槽。
2
The existing highway design criterion only takes setting pavement longitudinal grade, side ditch and drainage ditch into account in order to eliminate surface water.