A drainage channel is used for (line) drainage of surfaces. Rainwater is channeled from adjacent paved areas to the channel, from where it is fed into the sewer system or a seepage. Areas drained by linear drainage are evenly inclined towards the drainage channel, while areas with point drainage are biaxially inclined or concave (see slope ).
Prefabricated drainage channels often have a channel body lying below the surface for receiving and invisible drainage of the running water. These are available in different nominal widths (nominal width = internal dimension).
Gutters with grate covers
These channels consist of a channel base and, for example, a slotted grate as a support. The lower parts can be made of various materials ( stainless steel , galvanized or hot-dip galvanized steel, cast iron , fiber-reinforced concrete, polymer concrete , reinforced concrete , plastic), depending on the load class and purpose of the channel. The grids can also be made of different materials and have different slot or mesh sizes. The grids are either inserted or laid on and mechanically locked or screwed to the bottom part of the channel. There are also built-in grids that cannot be removed.
Another form of linear drainage are slot channels. These are often precast concrete parts which, in addition to a round or oval water duct, have a continuous or interrupted slot on the top to accommodate the incoming water. Slotted channels are also available on concreted curbs and made of stainless steel or galvanized steel. The latter are also used as facade slot channels in balconies , terraces and arcades .
Drainage of the water
The channel is drained via a drainage nozzle on the channel body in standardized size (named after the nominal width of the channel as DN 100, 150 ...) or via a gully. The drainage pipe is connected to the nozzle and is integrated into the sewer via a shaft or a branch .
Drainage channels are manufactured
- with built-in gradient (e.g. in 10 different gradient levels) or
- without slope. In this case, the drainage occurs through the free water level gradient. An internal gradient is not necessary hydraulically. Since drainage channels are usually not sealed, any remaining water can seep away.
Drainage channels are offered in standardized load classes A 15 to F 900 for pedestrian to heavy goods traffic. The load classes are described in EN 1433. Channels that meet this standard must have a CE mark. Drainage channels of load class D 400 are approved for motorways, but not across the direction of travel.
The RAS-Ew must be observed in road construction.
Applicable standards, in particular EN 1433, must be observed during manufacture and installation.