Changes

*Repair sunken areas when ≥ 10 cm deep and barren/eroded areas when ≥ 30 cm long;

*Repair sunken areas when ≥ 10 cm deep and barren/eroded areas when ≥ 30 cm long;

*Remove sediment when > 5 cm deep or time to drain water ponded on the surface exceeds 48 hours;

*Remove sediment when > 5 cm deep or time to drain water ponded on the surface exceeds 48 hours;

*Replace filter media around inlets periodically (e.g., every 5 to 10 years) to maintain treatment performance.

*Replace top 5 cm of filter media around inlets periodically (e.g., every 5 to 10 years) to maintain treatment performance.

|[[File:Filter bed bio pass.PNG|295px|thumb|center|There are no erosion gullies or bare soil areas on the filter bed surface and mulch cover remains in place.]]  

|[[File:Filter bed bio pass.PNG|295px|thumb|center|There are no erosion gullies or bare soil areas on the filter bed surface and mulch cover remains in place.]]  

|[[File:Filter bed bio fail.PNG|300px|thumb|center|Erosion gullies and bare soil areas are present on the filter bed surface, indicating that concentrated flow occurs regularly into the BMP feature. (Photo Source: CVC).]]  

|[[File:Filter bed bio fail.PNG|300px|thumb|center|Erosion gullies and bare soil areas are present on the filter bed surface, indicating that concentrated flow occurs regularly into the BMP feature. (Photo Source: CVC).]]  

==Tips to Preserve Basic BMP Function==

==Tips to Preserve Basic BMP Function==

*Maintain grading of the filter bed (or [[Vegetated filter strips|grass filter strip]] if present) at [[curb cut]] [[inlets]] so at least 5 cm of the back of the curb is visible through regular sediment removal and regrading.

*Maintain grading of the filter bed (or [[Vegetated filter strips|grass filter strip]] if present) at [[curb cut]] [[inlets]] so at least 5 cm of the back of the curb is visible through regular sediment removal and regrading.

*As the capacity of filter media to retain pollutants is finite, periodic replacement of filter media at inlet locations should be considered as an operation and maintenance best practice to maintain treatment performance.

*As the capacity of filter media to retain pollutants is finite, periodic replacement of the top 5 cm of filter media at inlet locations should be considered as an operation and maintenance best practice to maintain treatment performance.

*To avoid over-compaction of the [[Bioretention: Filter media|filter media soil]], any maintenance tasks involving vehicle or foot traffic on the filter bed should not be performed during wet weather.

*To avoid over-compaction of the [[Bioretention: Filter media|filter media soil]], any maintenance tasks involving vehicle or foot traffic on the filter bed should not be performed during wet weather.

*For bioretention with sod (i.e., [[Turf|turf grass]]) as [[vegetation]] cover, maintain with a push mower or the lightest mulching ride mower available and core aerate and dethatch annually in the spring to help maintain permeability.

*For bioretention with sod (i.e., [[Turf|turf grass]]) as [[vegetation]] cover, maintain with a push mower or the lightest mulching ride mower available and core aerate and dethatch annually in the spring to help maintain permeability.