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VortSentry HS

Gross Pollutant Trap (GPT)

The VortSentry HS is a hydrodynamic separator with a small footprint that makes it an effective treatment option for projects where space is at a premium. It uses a helical flow pattern that enhances containment of pollutants and provides effective removal of settleable solids and floating contaminants from urban runoff.

The VortSentry HS accepts a wide range of pipe sizes to treat and convey a wide range of flows. The unique internal bypass weir allows flows exceeding the treatment capacity to be diverted within the unit eliminating the need for an external bypass structure.

The system is housed inside a concrete manhole structure for easy installation and unobstructed maintenance access. In addition to standalone applications, the VortSentry HS is an ideal pre-treatment device.

How the VortSentry HS Treats Stormwater

  • Stormwater enters the VortSentry HS through an inlet pipe or grate inlet
  • Low, frequently occurring storm flows are directed to the treatment chamber where a tangentially oriented downward pipe induces a swirling motion in the treatment chamber that promotes the separation of suspended solids. Oil and floating debris are also captured in the treatment chamber
  • Moderate storm flows are directed into the treatment chamber through a secondary inlet, which allows for capture of floating litter and debris. The secondary inlet provides for treatment of higher flows without significantly increasing the velocity or turbulence in the treatment chamber
  • Flow exits the treatment chamber through the outlet flow control, which manages the amount of flow that is treated and helps maintain the helical flow patterns developed within the treatment chamber
  • Flows exceeding the system’s rated treatment flow are diverted away from the treatment chamber by the flow partition
  • Treated stormwater exits the VortSentry HS via the outlet pipe

Features and Benefits

  • Compact system
  • Helical flow pattern
  • Unique internal bypass
  • Multiple inlet configurations available
  • Small footprint; ideal for projects where space is at a premium
  • Enhanced capture and containment of pollutants
  • Eliminates the need for a separate bypass structure
  • Design flexibility

Configurations and Applications

The VortSentry HS is available in several precast concrete configurations, allowing for a variety of treatable flow rates and inlet/outlet pipe sizes. This design flexibility makes the system ideal for a wide range of applications such as:

  • Commercial, Industrial and Residential development, infill and redevelopment and stormwater quality retrofit applications
  • Special projects: Highways, airports, seaports and military installations
  • Pre-treatment for Water Sensitive Urban Design (WSUD), infiltration and rainwater harvesting and reuse systems


  • VortSentry HS provides unobstructed access to stored pollutants, making it easy to maintain                                        
  • Maintaining a VortSentry HS is a simple process that can be easily accomplished using a vacuum truck, with no requirement to enter the unit