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Stradal (Prefaest) concrete gutters, self-supporting type I.

The self-supporting drainage channels type I are made of reinforced concrete or Corten steel with a concrete filling.

Stradal, self-supporting gutters type I.

Our program consists of 2 types of self-supporting drainage channels.




A big step forward in the contemporary street scene.

Stradal's self-supporting Urban-I grate channels are marketed in the Netherlands by Diederen Afwateringstechniek. A self-supporting grid channel, with an aesthetically and innovatively designed grid, specially developed for a smooth integration into the design of our public space.

With the self-supporting I-type concept in accordance with EN 1433, the URBAN-I offers a technical and innovative solution to meet the contemporary challenge in the field of sustainable protection against flooding.

The grid
The URBAN-I grid adapts to your needs. Available in all RAL colors, so the possibilities for customizing the URBAN-I are great. Show your creativity and create a unique design in combination with this innovative solution. Let the URBAN-I be part of your design!


These line drainage channels have been the most sustainable solution for drainage projects for years.

Stradal's self-supporting HRI grid channels are marketed in the Netherlands by Diederen Afwateringstechniek. A self-supporting linear drainage, fitted with a cast iron "BANANE" or "SAÔNE" profile grate class D, 400KN or F, 900KN.

Stradal HRI® linear drainage channels are the most sustainable solution for drainage projects. The patented production method, which uses a very high (self-compacting) concrete quality and where the gutters are provided with a steel longitudinal and transverse reinforcement, to which the galvanized angle profiles and screw sleeves are also coupled, allow HRI® gutters to be installed without a support back could be. Even with traffic class F, 900KN. In accordance with NEN-EN 1433, drainage channels for traffic areas, the HRI® channels fall under the so-called I type.

HRI® gutters are equipped with pre-assembled, specially developed, nodular cast iron grids. The profile ensures optimal and fast water absorption. The HRI® gutters are also equipped with a sailing / nut end. In combination with the fitted pin / hole connection, this ensures optimal support between the channel elements. Thanks to the prepared sealant, it is possible to finish the elements liquid-tight. Sand collectors and end plates can be supplied with a PVC or HDPE connection.



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