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Inlets are producing concentrated flow and causing filter bed erosion
Inlets are producing concentrated flow and causing filter bed erosion
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*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 or restore [[mulch]]/[[stone]] cover. If problem persists, replace some mulch 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"|'''[[Bioretention: Construction checklist|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 filter media that meets design 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 [[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 <25 mm/h.
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Technician conducting sediment removal to ensure infiltration rates for the<br>
Technician conducting sediment removal to ensure infiltration rates for the<br>
practice are able to maintain > 25 mm/h. [https://sustainabletechnologies.ca/app/uploads/2018/02/Bioretention-and-Dry-Swales-Fact-Sheet.pdf Photo Source: TRCA, 2018]<ref>TRCA. 2018. Inspection and Maintenance of Stormwater Best Management Practices - Bioretention. Fact Sheet. https://sustainabletechnologies.ca/app/uploads/2018/02/Bioretention-and-Dry-Swales-Fact-Sheet.pdf</ref>
practice are able to maintain > 25 mm/h. [https://sustainabletechnologies.ca/app/uploads/2018/02/Bioretention-and-Dry-Swales-Fact-Sheet.pdf Photo Source: TRCA, 2018]<ref>TRCA. 2018. Inspection and Maintenance of Stormwater Best Management Practices - Bioretention. Fact Sheet. https://sustainabletechnologies.ca/app/uploads/2018/02/Bioretention-and-Dry-Swales-Fact-Sheet.pdf</ref>


==Inspection Time Commitments and Costs==
==Inspection Time Commitments and Costs==

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