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Based on where you are from, different countries have different terms for "storm drain". Depending on where you are from, different countries have different terms for "storm drain". Accordingly to Wikipedia, a storm drain is basically a tunnel that carry runoffs (rain) from urban areas. For http://www110.zippyshare.com/v/7OYGgGzw/file.html , it helps to think along the line of sewage system operates beneath our cities. In the states, this is often called http://www.datafilehost.com/d/a9c533d9 " or "storm sewer". In the united kingdom, this is also known as "surface water drain" or "surface water sewer". In Australia and New Zealand, it is often called "stormwater drain". And there it is, when you hear someone mentioning "storm drain", "storm sewer", "surface water drain","surface water sewer" and "stormwater drain", congratulations, you know they mean 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 counteract flooding. Although storm drains perform 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 enter the storm drains and cause choking which can eventually lead to flooding. To make sure 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 https://www.scribd.com/doc/294760697/Jonite-Stone-Grate drains to achieve the two purposes. Over at Jonite, we specialize in steel reinforced drain covers (gratings) that cover your storm drains while preserving the aesthetic areas of the architecture around the drain covers.