Pre-Treatment - Graf SICKER-BLOC COMPACT 300 Anleitung

3.1.7 Slope
If a system is installed at a distance of less than 5 m to a slope, mound or embankment with an incline of
more than 5°, a statically calculated supporting wall must be constructed to bear the pressure of the soil.
The wall must extend beyond the system by at least 0.5 m in all directions and must be at least 1 m away
from the system.
3.1.8 Frost-proof limit
In accordance with DIN 1986-100, the drainage pipes, which also includes pipes from connecting surfac-
es such as yards and roof areas, should usually be installed in an area free of frost. However, due to min-
imum distances from groundwater/stratum water, there may be limited installation options. Checks should
be undertaken on a case-by-case basis to establish whether a flatter installation would be sensible or, in
the case of a swale infiltration ditch, is indispensable.
3.2

Pre-treatment

The rainwater which is supplied to the infiltration system always requires a treatment stage. This may be
settling basins, filter shafts or simple filters that clean the incoming water of dirt particles. The ingress of
dirt should be avoided because the infiltration performance decreases if the system is clogged with fine
particles and, in extreme cases, results in a blockage.
In special cases, multi-stage filter systems with coarse and fine filters are used to purify the rainwater
accordingly. The exposure and size of the collection surface can be used to determine whether a multi-
stage system is necessary and which dimensions a corresponding filter should have. We would be
pleased to assist you with the selection of a suitable filter/filter shaft. GRAF offers an extensive product
range for this purpose.
3. Selecting the location
Figure 5: Installation situation: Distance to an upstream underground tank
GRAF Rain Bloc compact 300 modules are not suitable for inspection and /
or cleaning. The selection of a suitable external pre-filter therefore greatly
influences the long-term infiltration performance of the whole system.
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