Supply structure

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Supply structures in soil filters distribute the water supplied as homogeneously as possible on the filter surface (distribution structure).

A suitable construction reduces the hydraulic stress on the filter substrate and vegetation: flow energy and flow speed of the water are reduced in order to avoid undesired surface erosion and vegetation damage in the inlet area of ​​the floor filter . The energy conversion required for erosion protection in the inlet area can take place through stilling basins , rock fillings, the use of gabions, etc.

A large-area infiltration is aimed for in order to use the entire filter surface optimally for cleaning processes. As a rule, this is achieved through a wide or linear supply line (e.g. through overflow thresholds, inlet channels) to the retention area .

Frontal, punctiform supply structures, as they may be necessary if the retention floor filter is spatially limited, are unfavorable. The disadvantage of this structural design is a high potential flow velocity in the inlet area with the consequence of erosion of the filter surface. Here, especially in the case of reed planting, there is often a permanent downfall of vegetation in the main inflow.

The supply structure must be accessible for maintenance purposes (sediment removal).