Slope; Pre-Treatment - Graf ECO BLOC INSPECT 420 Mode D'emploi

5.2

Slope

When installing a system at a distance of less than 5 m from a slope, mound or embankment with a
gradient of >5°, a statically calculated retaining wall must be erected to absorb the earth pressure. The
wall must overhang the installation by at least 0.5 m in all directions and be erected at a minimum
distance of 1 m from the system.
5.3

Pre-treatment

Surface and rainwater that enters the infiltration or attenuation system always requires a treatment stage.
This may be an oil separator, slit trap, filter shafts or simple filter which removes oil, dirt & debris from the
incoming water. The ingress of dirt should be avoided at all times as this will settle within the infiltration or
attenuation system causing reduced performance, blockage and possible system failure.
5. Location options
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