Changes

*Add [[Level spreaders|flow spreading device]] or re-grade existing device back to level. Rake to regrade damaged portion of the filter bed and replant. If problem persists, replace some [[vegetation|plant]] cover with [[stone]].

*Add [[Level spreaders|flow spreading device]] or re-grade existing device back to level. Rake to regrade damaged portion of the filter bed and replant. If problem persists, replace some [[vegetation|plant]] cover with [[stone]].

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| rowspan="3"|'''[[Bioretention: Construction checklist|Filter Bed]]'''

| rowspan="3"|'''[[Swales: Construction|Filter Bed]]'''

|Local or average sediment accumulation ≥ 5 cm in depth.

|Local or average sediment accumulation ≥ 5 cm in depth.

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*At [[inlets]] remove [[stone]] and use vacuum equipment or rake and shovel to remove sediment. For large areas or BMPs, use of a small excavator may be preferable. Restore grades with planting soil that meets design specifications. Test surface infiltration rate to confirm it is > 15 mm/h. Replace [[stone]] and [[vegetation]] coverage (re-use/transplant where possible). If problem persists, add [[pretreatment]] device(s) or investigate the source(s).

*At [[inlets]] remove [[stone]] and use vacuum equipment or rake and shovel to remove sediment. For large areas or BMPs, use of a small excavator may be preferable. Restore grades with planting soil that meets design specifications. Test surface infiltration rate to confirm it is > 15 mm/h. Replace [[stone]] and [[vegetation]] coverage (re-use/transplant where possible). If problem persists, add [[pretreatment]] device(s) or investigate the source(s).

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|Surface ponding remains for >48 hours or surface infiltration rate is <25 mm/h.

|Surface ponding remains for > 48 hours or surface infiltration rate is < 15 mm/h.

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*Remove sediment as described above. Core aerate (for sodded bioretention); or remove stone, sediment, mulch, and plant cover and till the exposed filter media to a depth of 20 cm; or remove and replace the uppermost 15 cm of material with filter media that meets specifications. Test surface infiltration rate (one test for every 25 m2 of filter bed area) to confirm it is > 25 mm/h. Replace stone, mulch and plants (re-use/ transplant where possible).

*Remove sediment as described above. Core aerate (for grass swales); or remove [[stone]], sediment and [[vegetation|plant]] cover and till 5 cm of yard waste compost into the exposed planting [[Soil groups|soil]] to a depth of 20 cm; or remove and replace the uppermost 15 cm of material with planting soil that meets design specifications. Test [[Infiltration: Testing surface infiltration rate]] to confirm it has been restored to > 15 mm/h. Replace stone and plants (re-use/transplant where possible).

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|Damage to filter bed or slide slope is present (e.g., [[erosion]] rills, animal burrows, sink holes, ruts)

|Damage to filter bed or slide slope is present (e.g., [[erosion]] rills, animal burrows, sink holes, ruts)

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*Regrade damaged portion by raking and replant or restore [[mulch]]/[[stone]] cover. Animal burrows, sink holes and compacted areas should be tilled to 20 cm depth prior to re-grading. If problems persist, consider adding flow spreading device to prevent [[erosion]] or barriers to discourage foot or vehicular traffic.

*Regrade damaged portion by raking and replant or restore [[stone]] cover. Animal burrows, sink holes and compacted areas should be tilled to 20 cm depth prior to re-grading. If problems persist, consider adding [[Level spreaders|flow spreading device]] to prevent [[erosion]] or barriers to discourage foot or vehicular traffic.

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|'''[[Vegetation]]'''

|'''[[Vegetation]]'''

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Vegetation is not thriving and filter media is low in organic matter (<3%) or extractable phosphorus (<10 mg/kg)

Plants not thriving and planting soil is low in organic matter (<5%) or available [[Nutrients|phosphorus]] (<12 mg/kg)

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*Remove stone, mulch and plant cover and uppermost 5 cm of filter media, spread 5 cm of yard waste compost, incorporate into filter media to 20 cm depth by tilling. Replace stone, mulch and plants (re-use/transplant where possible).

*Remove [[stone]] and [[vegetation|plant]] cover and uppermost 5 cm of planting soil, spread 5 cm of yard waste compost, incorporate into [[Soil groups|soil]] to 20 cm depth by tilling. Replace stone and plants (re-use/transplant where possible).

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