Depending on where you are from, different countries have different terms for "storm drain". abc

Subject to where you are from, 3 inch drain cover have different terms for "storm drain".
Accordingly to Wikipedia, a storm drain is basically a tunnel that carry runoffs (rain) from urban areas. For a layman, it helps to think along the line of sewage system that functions beneath our cities.
In the states, this is also known as "storm drain" or "storm sewer".
In the united kingdom, this is actually commonly known as "surface water drain" or "surface water sewer".
In Australia and New Zealand, it is also known as "stormwater drain".
And there it is, the next time you hear someone mentioning "storm drain", "storm sewer", "surface water drain","surface water sewer" and "stormwater drain", you now know they refer to the same thing.
Functions of storm drain include draining excess water (rain or storm water) and ground water from pavement, streets and carparks into rivers and streams in order to avoid flooding.
Although storm drains accomplish a amazing job of draining excess water from the urban areas, the inlets are essentially openings where left uncovered could be a hazard to pedestrians. Left uncovered, rubbish will enter the storm drains and cause choking which may eventually cause flooding.
To ensure storm drains serve their purposes while minimizing the dangers posed to pedestrians and to prevent choking of the drains, drain covers (gratings) are employed to cover the inlets (openings) of the storm drains to accomplish the two purposes.
At Jonite, we specialize in steel reinforced drain covers (gratings) for your storm drains while preserving the aesthetic elements of the architecture around the drain covers.