English translation: [US > storm drain/storm sewer] [UK > surface water system] [Australia > stormwater drain]
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Explanation: Depending on context, I think it might be important to specify 'rainwater' as often in rural areas the rainwater may drain off into a field, while the sewage will go either in the septic tank or the mains sewer...'Tout-à-l'égout' is when it all goes into the mains sewer together.
Irene McClure Local time: 12:55 Native speaker of: English PRO pts in category: 12