Cleaning Of The Connected Areas; Treatment Of The Rainwater; Rainwater Treatment - Graf Ecobloc Inspect Smart Anleitung Für Den Betrieb Und Die Wartung

3.

Cleaning of the connected areas

3.1

Treatment of the rainwater

To ensure perfect operation of the infiltration/attenuation system, filters of sufficient sizes should usually
be fitted. These filters are required to be installed upstream of the infiltration/attenuation system.
In special cases, multi-stage filter systems with coarse and fine filters are used to treat the rainwater. The
exposure and size of the collection surfaces can be used to determine whether a multi-stage system is
needed and the size of filter required. We would be happy to help you select an appropriate filter/filter
shaft. GRAF provides an extensive range of such products.
National or international guidelines or standards such as the DWA A-138 or the DWA M-153 in Germany
contain sizing examples and information about filter stages upstream of infiltration/attenuation systems.
3.2

Rainwater treatment

The DWA data sheet M-153 provides various recommendations for working with rainwater. An overview is
provided in Table 1.
Groundwater intake
Swales
Surface infiltration
In areas with high concentrations of pollutants, several filter systems can also be combined to form one
overall filter. This firstly filters out coarse particles and then retains dissolved substances.
The layers of soil which the rainwater penetrates during the infiltration process before it reaches the
groundwater also have a filtering effect. A distance of one metre between the bed of the infiltration system
and average groundwater level should therefore be maintained during the planning phase and/or when
setting up the system in accordance with DWA A-138 or other national guidelines.
3. Cleaning of the connected areas
Table 1
Retention soil filters
Sand filters
Ponds
Sedimentation systems
Silt traps
Purification basins for
rainwater
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Filters
Coarse filters
Fine filters
Substrate filters