Hydrodynamic Separators

Hydrodynamic separator BMPs protect our local waterways by capturing pollutants before they enter the storm drain system.

As stormwater passes through a separator’s vortex chamber, pollutants are diverted to holding chambers, while cleaner runoff is directed to the storm drain system.
 

Benefits

Hydrodynamic Separators may offer the following benefits:
 

  • Captures sediment, trash, and debris

 

What does your BMP look like?

Typical Hydrodynamic Separator BMPs configuration can include:

  • Inlet Structure: A curb inlet or grated opening to direct stormwater into the separator.
  • Vortex Chamber: The primary treatment zone where centrifugal forces separate pollutants like sediment, debris, and oil.
  • Sediment Collection Chamber: A designated area at the bottom of the unit to capture and store settled solids.
  • Oil and Grease Trap: A compartment or skimmer to collect floatable pollutants like hydrocarbons.
  • Outlet Structure: A discharge pipe or weir to direct treated water into the storm drain system.
  • Access Ports or Maintenance Covers: Openings to facilitate inspection, cleaning, and maintenance of the unit.
     

Target Pollutants

 
  • Sediment (soils particles, road dust, gravel, sand, etc.)
  • Oil and grease
  • Trash
  • Metals
  • Bacteria
     

Inspection & Maintenance Activities

Activity Suggested frequency/schedule
Inspect for accumulated sediment/debris As needed
Remove of accumulated material with a vacuum truck Annual, or more frequent as needed


Vendor’s List

Visit our Vendor's List page to learn more about contractors serving San Diego County.


*The County does not endorse or recommend any particular vendor. Inclusion or non-inclusion on this list does not constitute representation or warranty regarding the qualifications of any vendor or resource.
 

BMP Fact Sheets in PDF format

Structural BMP Outreach Flyers (Educational Resources Page)
 

Contact

  (858) 495-5323

  BMP.Program@sdcounty.ca.gov

 

 

Maintaining My Structural BMP Home Page