The modules must be able to withstand a static pressure load of at least 115 kN per m2 and a pressure load of 65 kN on 0.12 m2, corresponding to an axle load of 11 tonnes. The sides must be integrated into the system, where they must be able to withstand a pressure load of at least 100 kN per m2.
The sides should be part of the supporting element.
The maximum defl ection at the centre of the module´s surface when installed 40 cm in the roadway (10 cm asphalt and 5-6 cm of stonefree material such as 0-8 mm sand fi ll and 25 cm of stable gravel 0-32.) is max 1-1.8 mm per m2, which must be documented by an approved and certified research institute.
It must be possible to clean the basins via a pipe hole of at least a diameter of 500 mm in all basins and the water fl ow must be unobstructed throughout the entire 500 mm diameter of the pipe hole. It must be possible to separate all channels both horizontally and vertically so that the basin can be divided into several sections
with the possibility of installing overfl ows. All individual channels must be able to be cleaned and TV-inspected.
The system must be able to incorporate buffer basins and sand traps – with no size restrictions – and still have a waterproof basin. It must be possible to install road drains with a minimum 300-litre sand trap and drainage outlets of DN 315 mm and/or DN 425 mm. The basin must be able to contain substrates for rainwater treatment that are shielded from the rest of the basin system and substrates must be replaceable. If needed, parts of the basin should be able to drain water in sections.
For inspection purposes, the basins should be able to accommodate DN 425 mm pipes from the top of the basins. Water brakes and rat barriers should be installable in the system, which will be accessible within the modules. An approved EPD must be available for the entire basin (all components and assembly of
these) and a lifetime of at least 75 years must be documented by a recognized GTS Institute.
