de686747_inとは___goo_Wikipedia__ウィキペディア___American_English
[0] Road gully [British English] Consists of a gully grating on a chamber that connects to a surface water sewer / drain, ditch, or watercourse [Comments] Only stormwater [American English] 
See roadside ditch
Storm drainとは - goo Wikipedia (ウィキペディア)
American English