Stormwater treatment plant Multiple plants

Stormwater Treatment with 3P Hydrosystem ®

Operating principle

  1. The rainwater from the area to be drained is introduced at the lower end of the shaft of the rainwater treatment plant, and the water is deflected tangentially by a deflection aid.
  2. Here, sedimentation of particles, especially of the sand fraction, takes place in a hydrodynamic separator due to turbulent secondary flows in a radial, laminar flow regime. In this way, solids are already retained here and the filters are effectively protected against colmation.
  3. These are collected via an opening in the lower part of the cleaning shaft in a sludge trap under the system, the sludge trap is sucked out at intervals.
  4. In the middle of the cleaning shaft there are 4 filter elements, with these filter elements the fines are filtered in the upflow process and a large part of the dissolved pollutants are adsorptively bound, the filter can be backwashed and in case of complete sludge formation it can be easily replaced. The design of the individual filters enables the operator to safely and sustainably maintain the material cycle.
  5. The clean water is located above the filter elements. It passes through a light-matter barrier (in the event of an accident, larger quantities of oil and gasoline are retained (for example, in the event of an accident), "normally" occurring hydrocarbons are removed in the filter) and then flows through the drain into the seepage system or into the body of water.


  1. Inlet rainwater (DN 200)
  2. Diversion aid
  3. Hydrodynamic separator
  4. Sludge trap
  5. Filter element
  6. Removal aid for filter element
  7. Maintenance tube
  8. Light material barrier
  9. Inlet rainwater storage tank, infiltration system or water body (DN 200)
  10. Buoyancy protection for filter elements

Video: functional principle

Stormwater treatment system

Stormwater treatment system drawings









For larger catchment areas or higher flow rates, it is possible to individually combine a certain number of filter elements.

For such filter structures, sedimentation and filtration are separated, i.e. a sedimentation unit must be installed before the actual filter unit. The planning is done on a case-by-case basis according to the conditions of the catchment area and the purification objective. The plants can be designed as direct-flow filter units. It should be noted that each filter compartment must be shut off for maintenance purposes.

The quality of the purified water is so high that it can be discharged directly into surface waters. In the system, rainwater is purified by sedimentation, adsorption, filtration and chemical precipitation. In the first step, the water passes through a sedimentation unit where solids are safely removed. Then, in a second structure, the water passes through a series of filter elements in an upflow process. Depending on the purification target (heavy metals, phosphorus), the filter elements can be filled with adapted filter materials. The elements are easily replaceable.

Stormwater treatment plant Technical data

  • Delivery and installation of the shaft structure described below for the treatment of precipitation water from traffic areas, roof and metal roof areas. Precast concrete parts corresponding to strength class C35/45 according to DIN EN 206-1 and DIN 1045-2/4 (no fair-faced concrete)


3P Hydrosystem ® Twin

Connectable area up to 1.000 m² heavy traffic areas
Hydraulic flow of the filters when new: min. 24 l/s
Hydraulic flow rate: min. 5 l/s
Installation in manholes up to D = 2.0 m

3P Hydrosystem ® Drilling

Connectable area up to 1.500 m² heavy traffic areas
Hydraulic flow of the filters when new: min. 36 l/s
Hydraulic flow rate: min. 7.5 l/s
Installation in manholes up to D = 2.5 m

3P Hydrosystem ® quintuplet

Connectable area up to 2.500 m² heavy traffic areas
Hydraulic flow of the filters when new: min. 60 l/s
Hydraulic flow rate: min. 12.5 l/s
Installation in manholes up to D = 3.0 m

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