In that case, maybe you can refer to the Japanese Wikipedia, it says 諸外国では日本で取り扱っている建築の技術部門や環境に関する部門も土木として扱われており、日本の土木工学と必ずしもイコールではない。Accordingly, there is no such a Japanese term which always perfectly matches 'civil engineering' used in English speaking countries. Uh, sounds reasonable to me, as they are two distinct languages.

@Chen thanks for your comments. Please refer to: http://en.wikipedia.org/wiki/Civil_engineering "Civil engineering is the oldest engineering discipline after military engineering,[4] and it was defined to distinguish non-military engineering from military engineering.[5] It is traditionally broken into several sub-disciplines including environmental engineering, geotechnical engineering, structural engineering, transportation engineering, municipal or urban engineering, water resources engineering, materials engineering, coastal engineering,[4] surveying, and construction engineering.[6] Civil engineering takes place on all levels: in the public sector from municipal through to federal levels, and in the private sector from INDIVIDUAL HOMEOWNERS THROUGH TO INTERNATIONAL COMPANIES."

jubinell, in the definition of 'civil engineering' you give above, it says 'and buildings' at the end, I think it is not meant to include things like houses or office buildings, but buildings like lighthouses, landmark buildings and all that. So the most appropriate Japanese term for it is 土木工学. Ps. The Japanese term for architecture is 建築学.

@Eliot thank you for your comments, but as I said, I do not think 土木 corresponds well to civil engineering. What 土木 refers to (as I have researched), is "public works" construction (such as bridges, roads, tunnels, etc.) but not other civil constructions, such as houses, office buildings, etc. If you have a link to a source that says otherwise that would be greatly appreciated.

土木工学 【どぼくこうがく】 (n) civil engineering http://www.csse.monash.edu.au/~jwb/cgi-bin/wwwjdic.cgi?1E Check out the website for the best JP dictionary around.