Main Page | See live article | Alphabetical index A storm drain system is designed to drain excess rain and ground water from an area. Ideally storm drains should be separate from sanitary sewers. Storm drains are present on most motorways, freeways and other busy roads, as well as towns in areas which experience heavy rainfall, flooding and coastal towns which experience regular storms. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.