Vegetated BMPs

Vegetated BMPs filter stormwater pollutants by directing runoff to flow through soil and vegetation. After heavy rainfall, runoff collected in the BMP slowly soaks into the soil, reducing both the amount of runoff and pollutants entering the local storm drain system. These BMPs are typically found in low-lying vegetated areas or surface-level planters.

 

Benefits

Vegetated BMPs may offer the following benefits:

  • Reduce runoff volume and peak flows
  • Reduce erosion
  • Filter pollutants from stormwater
  • Can offer aesthetic value
  • Promote evapotranspiration, helping manage excess water naturally

What does your BMP look like?

Typical vegetated BMP components can include:
 

  • Inflow distribution mechanisms (e.g., flow spreader)
  • Vegetated surface layer
  • Check dams (if required)
  • Optional aggregate storage layer with underdrain(s)
     

Target Pollutants

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

Inspection & Maintenance Activities

Activity Suggested frequency/schedule
Inspect for accumulation of sediment, litter, and debris Montlhy
Inspect for damage to structural components such as weirs, inlet or outlet structures Monthly and after significant rain events
Inspect for poor vegetation establishment, dead or diseased vegetation, or overgrown vegetation Monthly
Inspect for proper drainage and erosion After significant rain events
Check for signs of mosquito breeding Monthly and after significant rain events


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