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 which works beneath our cities.
In the states, this is actually often called "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", you now know they refer to exactly 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 counteract 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 the storm drains and cause choking which might eventually end up with flooding.
In order 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 used to cover the inlets (openings) of the storm drains to achieve the two purposes.
Over at Jonite, we focus on basement drain covers steel reinforced drain covers (gratings) for your storm drains while preserving the aesthetic components of the architecture around the drain covers.
What is a channel drain?
A channel drain is essentially the same thing as the trench drain. The fact is, there are several names such as line drain, slot drain, linear drain or strip drain which all refer to the custom floor grates identical object.
A channel drain (trench drain) is a kind of floor drain that has a channel shaped body characterized by its long length and narrow width.
Channel drains (trench drains) are often mistaken for french drainage grating drains. It is advisable to keep in mind that french drains aren't the same as channel or trench drains.
With almost any drains, channel drains (trench drains) too need a cover to serve as a safety precaution as well as to prevent large objects from entering the drains which cause choking.
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Link to: http://www.jonite.us/products/channel-grates