de686747_inとは___goo_Wikipedia__ウィキペディア___American_English
[0] Stormwater bypass [British English] A combined sewer discharge pipeline intended to bypass wastewater treatment plants during a peak runoff events.[citation needed] [Comments] Stormwater mixed with sewage [American English] 
Same as British English
Storm drainとは - goo Wikipedia (ウィキペディア)
American English