area of culvert transect
Back filling at abutment back of Bridge or culvert
Box culvert
箱涵
方形去水渠
盒形排水渠
箱形涵洞
箱形暗渠
盒形暗渠
盖板涵
电压互感器
箱形通道
box-culvert jacking method
Bridge and Culvert Base
Bridge and culvert construction
bridge and culvert designs
bridge and culvert engineering
bridge and culvert hydrology
bridge and culvert jack-in