Conventional drainage
| Products | Foam embedded desired connecting sleeve | Loose-/thrust-flange construction | Internal drainage | Drainage threw the parapet* | Non-flammable | Nominal with up to DN 200 |
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 SitaStandard |
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 SitaTrendy |
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 SitaTrendy Flange |
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 SitaMulti |
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 SitaTurbo |
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The conventional method for flat-roof drainage
Open channel drainage is the conventional method for internal drainage of flat roofs. It is regulated and standardized by European norms.In utilizing open channel outlets, flat roofs are drained via roof gullies and a piping system that is installed on a gradient. The pipes operate with a partial filling of water. The maximum filling level in both collection and underground pipes of h/d = 0.7 and of f = 0.33 in the downpipes may not be exceeded.
Open channel drainage is characterized by gravitational mechanics for draining rainwater being employed. An invert gradient determines the capacity of this open channel drainage as does the construction design of the roof gully.
Drain funnels of the roof gullies serve to increase the drainage capacity.
Characteristics of open channel drainage
- pipe system installed on a gradient
- pipe system partially filled
- extensive underground piping
- high capacity through funnel-shaped drainage units
- installation of an emergency drainage system