雨水管道应按设计规定的位置安装，悬吊管不设坡度、要水平安装。
Stormwater pipeline design requirements should be the location of installation, suspension control is no slope to the level of the installation.
类似下水管道，铁路线的坡度平缓，经常从地下穿过或从高空越过高速公路、溪流、险山和其他障碍物。
The grades are gentle and, like drainages, the routes often go under or over barriers such as highways, creeks, steep hills or other obstructions.
尤其是各浓度下，倾斜管道中的水力坡度研究几近空白。
Especially the study on the hydraulic gradient in the inclined pipes is nearly blank.
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