In design of highwaydrainage system, the rainfall reappearing period is a very important parameter.
在公路排水系统设计中，降雨重现期是一个非常重要的参数。
2
For lining seepage water of highway tunnel, the paper discussed how to strengthen waterproof, drainage design and construction quality control for reference.
隧道衬砌渗漏水是公路隧道的通病，应引起重视，在施工中应加强防排水设计与施工质量的管理。
3
It is used to drill heavy duty pretension anchor holes at side slope of water power station, railway or highway projects, as well as drainage holes.