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

Based on where you are from, different countries have different terms for "storm drain".
Accordingly to Wikipedia, a storm drain is actually a tunnel that carry runoffs (rain) from urban areas. For a layman, it helps to think along the line of sewage system that works beneath our cities.
In the states, this is actually popularly known as "storm drain" or "storm sewer".
In the united kingdom, this is actually often called "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", congratulations, you know they talk about 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 to protect yourself from flooding.
Although storm drains do a amazing job of draining excess water from the urban areas, the inlets are essentially openings where left uncovered could be a danger to pedestrians. Left uncovered, rubbish will get into drainage covers and cause choking which may eventually trigger flooding.
In order to ensure storm drains serve their purposes while minimizing the potential risks 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 achieve two purposes.
Over at Jonite, we specialize in steel reinforced drain covers (gratings) for your storm drains while preserving the aesthetic areas of the architecture around the drain covers.