Various
The ultimate manhole covers site
Drainage channels for vehicular and pedestrian areas
The European standard for drainage channels for vehicular and pedestrian areas. Classification, design and testing requirements, marking and evaluation of conformity

Download the standard from the British Standards Institute site (payment) https://shop.bsigroup.com/ProductDetail/?pid=000000000030158536

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
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