Going-back-as-far-as-the-Roman-times-in-ancient-Rome-Man-has-started-using-stone-to-cover-up-drain-covers-o

Moving back as far as the Roman times, in ancient Rome Man has started using What is a floor drain? to protect drain covers.
The layman term for What is a floor drain? (grate) is manhole cover. Say "manhole cover" and pictures of spies/heros making use of the underground sewage system popping out of manhole cover in Hollywood films appear.
Historically since that time Man invented the sewage system since the Roman Times to drain water and urban waste away for sanitation purposes, manhole covers (drain covers or grates as we would prefer to call them) have already been invented out from the necessity to prevent people from falling into underground sewage as well as to prevent large objects from entering the drains which cause choking which eventually may lead to flooding.
Fast forward to the present day, the sewage system is still being employed under all cities all over the world. Instead of the crude stone manhole covers the Romans used in the ancient days, nowadays we have special steel reinforced stone gratings that serve the thousand year old function of covering the inlets of our sewage system.
What is a floor drain? than just a cover, check out Jonite's range of drain covers (drain gratings) here: http://www.jonite.us/products/creative-grates