Moving back as far as the Roman times, in ancient Rome Man has started using stone to cover up drain covers.
The layman term for drain cover (grate) is manhole cover. Say "manhole cover" and pictures of spies/heros using What is a French drain? popping out of manhole cover in Hollywood films appear.Historically ever since Depending on where you are from, different countries have different terms for "storm drain". 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 been invented out of the necessity to stop people from falling into underground sewage as well as to prevent large objects from entering the drains which cause choking which eventually could lead to flooding.Fast forward to the current day, the sewage system is still utilised under all cities all over the world. Rather than the crude stone manhole covers the Romans use in the ancient days, now we have special steel reinforced stone gratings that serve the thousand year old function of covering the inlets of our sewage system.More than merely What on earth is grate |grating |grateing|gratting? , check out Jonite's range of drain covers (drain gratings) here: http://www.jonite.us/products/creative-grates