Location Options; Location; Pre-Treatment - Graf ECO BLOC INSPECT FLEX Notice D'installation

5.

Location options

5.1

Location

The location of an infiltration system should be such that percolating water does not cause damage to
buildings or other installations. To avoid erosion and accumulation, an infiltration system should be
located at a distance of at least 1.5 times the installation depth.
A
The distance between the installation base of an infiltration system and the average highest groundwater
level expected must not fall below one metre (3'-3.4") according to most national standards. If this
distance does fall below one metre (3'-3.4") approval must be sort from the relevant authorities.
Distance (A') to existing or planned trees must also be at least the expected crown diameter (A).
5.2

Pre-treatment

Surface and rainwater that enters the infiltration, retention or detention system always requires a
treatment stage. This may be an oil separator, silt 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
A'
22 / 64
1,5 x H
H