operational area | usage

  • Receiving tank or weir/dam as part of municipal networks or industrial plants
  • Used as a storage system for restricted discharge of the wastewater to the subsequent sewer system or wastewater treatment plant in heavy rainfall

Technology | Process

The task of drainage networks is, alongside wastewater, to safely remove rainwater which gets into the sewers, in order to limit combined wastewater discharge to a justifiable extent in economic and process engineering terms. At the same time, the impact on flowing bodies of water caused by discharge from a combined wastewater sewer is to be kept as low as possible. Stormwater retention systems should take up large quantities of combined wastewater in the case of events and then discharge them in a controlled way. The process engineering system solution used ensures controlled inlet and discharge of the stormwater and automated cleaning of the tank. The normal dry weather flow in the pipeline sewer or main collector passes through a flow-dividing structure. The sewers can be maintained by manual flushing or using flushing vehicles. A mechanical or electromechanical flow-restricting device at the
flow-dividing structure automatically controls compliance with the planned discharge to the wastewater treatment plant. If a regional event occurs, substantial quantities of combined wastewater and detached deposits from the upstream sewer network arrive at flow-dividing structure. The activated restrictor produces backwater. The subsequent overflow process via the flow-dividing sill fulfil the sewer management and floating material retention objectives. In addition mechanical or electromechanical overflow flap valves and floating scumboards or automatic disc filters, possibly fine bar screens are used. A tank overflow protects the downstream stormwater tank from overload, controls the function of the overflow structure for settled combined wastewater and contains the flood protection equipment in the form of flap valves or electromechanical gate valves. The stormwater tank accepts the planned quantity of combined wastewater and if necessary uses mechanical installations to control the overflow of settled combined wastewater. After the stormwater tank has been fully drained, jet cleaners, flushing flaps or flushing tipping buckets, which are coupled or process controlled, are used for automatic flushing of the bottom of the tank. The type of automatic cleaning results from the local conditions with gradient, flushing and pump sump and the operator’s standards. The wks group provides support in the form of consultations and advice about the advantages and use limits of equipment and controls, supplies and installs them ready for use and provides service near the project.

Process Engineering Components

  • Pumping stations
  • Cleaning equipment for retaining coarse material, such as disc filter system for fine bar screens
  • Scumboards for retaining floating material
  • Flap valves and weirs for water level control
  • Flushing equipment (surge flushing) such as flushing tipping buckets or flushing flaps
  • Flow control systems such as flow restrictors and discharge controllers
  • Control system for fully automatic operation
  • Optional integration in the process control system


  • Equipment components integrated into the system solution, and thus optimum functional properties and reduced investment and operating costs
  • Significant increase in functional safety and reliability compared to standalone solutions
  • Variable range of technical equipment adapted to the conditions
  • Fully-automatic operation with individually adapted control system
  • Flushing equipment (flushing tipping bucket) is external energy-free and has low flushing water requirement
  • Good operating and maintenance conditions
  • Components and system suitable for retrofitting and upgrading stormwater retention systems

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