Covered trenches and tunnels are also less disruptive ... aqueduct engineers should carve a tunnel through a mountain rather than build a trench around one. When not too deep, shafts are dug ...

If high-speed rail ends up running through a covered trench in Palo Alto, it won’t be easy or cheap, new California High-Speed Rail Authority data indicates. In fact, building a trench for both ...

Though you can find decorative trench grates like this at Home Depot, most are boring, black drain covers. If you aren't ...

Shanghai Jiao Tong University along with multiple collaborating institutions including the University of Copenhagen and Lawrence Berkeley National Laboratory, have conducted an extensive investigation ...