Stormwater management - Southwest Washington

Sediment trap

This sediment trap needs to be cleaned.

Biofiltration swale

Noxious weeds have taken over this biofiltration swale.




Biofiltration swale and filter strip

Maintenance is needed if you see these signs
• Bare, exposed soil
• Clogged inlet and outlet pipes
• Bottom of swale is eroded 
• Sediment buildup, usually near inlet
• Unhealthy or dead vegetation
• Blackberries or other problem vegetation
• Overgrown vegetation
• Leaves, trash and other debris

Checklists for maintenance and recognizing and fixing problems (PDF files)
Biofiltration swale
Filter strip

Field inlet
Sediment trap
Access road
Fence, gates, signs