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4.
Load categories
4.1
Installation under surfaces suitable for pedestrian loading
When installing under surfaces suitable for pedestrian loading, vehicles of any kind must be
prevented from driving over the surface through structural measures or cordoning off. The
structure of layers in green spaces above the infiltration system is different from surfaces
with traffic loading, see section 4.2. The possible installation depths and max. earth cover-
ings are stated in Table 3 and Table 4.
4.2
Green spaces above the infiltration system
If a lawn is planted above the infiltration elements, the system should be covered with a water-
impermeable film or a layer of clay roughly 100 mm thick because otherwise this lawn area may dry out
more quickly than the rest of the lawn.
4.3
Installation under surfaces suitable for vehicle loading
The minimum and maximum earth coverings differ depending on the various load catego-
ries: car, truck 12, HGV 30, HGV 40 and HGV 60. Table 3 shows the min. and max. earth
coverings for the various load categories. Deviating installation situations should always be
discussed with Otto GRAF GmbH.
Fillers (reused excavated material and/or gravel) with a maximum density of 20 kN/m³ are
needed.
Note:
During and after installation, ensure that only load categories approved for the construction
project drive over or park on the infiltration ditch modules. Fences, barrier tape or warning
signs can prevent unapproved vehicles from accessing sensitive areas.
The following table shows the minimum and maximum earth coverage.
for pedes-
Category
trian load-
Earth covering
(min.) [m]
Earth covering
(max.) [m]
Table 3 - min. and max. earth coverings depending on the load and friction angle
* Friction angle
35° and backfill with a specific weight
** Friction angle
40° and backfill with a specific weight
RStO 12 is required, the minimum earth covering may increase.
4. Load categories
Suitable
Car
ing
0.25*
0.25*
3.00
3.00
Truck 12
HGV30
0.50*
0.50*
3.00
2.75
20 kN/m³
18 kN/m³ If a road construction according to
0 /
HGV40
HGV60
0.50**
0.50**
2.5
2.25
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