The existing public network for waste water drainage is along south side of the plot and the system is pressurized.
现有的公共污水管网沿着地块的南面，这部分系统是压力系统。
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.
现有的公路设计中，考虑较多的仅仅是通过设置道路的纵坡、边沟及排水沟等设施来排除地表水。
3
In this case, the water table is not flow surface and there is no "seepage surface" on the side walls of drainage river channel.