Splitzer From United Kingdom, joined Feb 2004, 151 posts, RR: 0
Reply 2, posted (9 years 7 months 1 week 6 days 21 hours ago) and read 2019 times:
This was pointed out to me when I visited Paris in December by a friend. He said it was simply a way to clean the streets - flush all the rubbish and dust that collects in the gutters into the drains. I'd say this was a valid point as I'd seen road sweepers sweep rubbish into the paths of water.