Subject to where you are from, different countries have different terms for "storm drain".

Subject to where you are from, different countries have different terms for "storm drain".
Accordingly to Wikipedia, a storm drain is essentially a tunnel that carry runoffs (rain) from urban areas. For a layman, it helps to think along the line of sewage system functions beneath our cities.
In the states, this is best known "storm drain" or "storm sewer".
In the UK, this is best known "surface water drain" or "surface water sewer".
In Australia and New Zealand, it is also known as "stormwater drain".
And there you have it, the very next time you hear someone mentioning "storm drain", "storm sewer", "surface water drain","surface water sewer" and "stormwater drain", you now know they talk about the exact 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 accomplish a amazing job of draining excess water from the urban areas, the inlets are essentially openings where left uncovered can pose a danger to pedestrians. Left uncovered, rubbish will get into the storm drains and cause choking which might eventually end up with flooding.
In order to ensure storm drains serve Jonite channel drain covers while minimizing the risks posed to pedestrians and to prevent choking of the drains, drain covers (gratings) are used to cover the inlets (openings) of the storm drains to achieve the two purposes.
At Jonite, we concentrate on steel reinforced drain covers (gratings) for your storm drains while preserving the aesthetic aspects of the architecture around the drain covers.