Load-Class & Cover-Depth Selector

Pick your traffic context to see the EN 124 surface class, the buried-crate duty and an indicative cover depth. Cover depth is a design starting point — the final figure is calculated to the crate’s crush rating.

What will run over the soakaway?

EN 124 surface class D400

Surface test load400 kN (≈40 t test load)

Design vehicle referenceHGV wheel load

Buried-crate dutyHeavy-duty crate

Indicative cover depth~800–1200 mm

D400 rates the surface cover/grating, not the crate. The crate below carries a manufacturer vertical rating from a compression test — order both numbers separately.

Request a load-class check & D400 spec sheet