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Inspection and Maintenance: Bioretention & Bioswales (view source)
Revision as of 16:12, 29 April 2022
, 2 years ago→Routine Maintenance - Key Components and I&M Tasks
*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.
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|[[File:Filter bed bio pass.PNG|395px|thumb|center|There are no erosion gullies or bare soil areas on the filter bed surface and mulch cover remains in place.]]
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|[[File:Filter bed bio fail.PNG|400px|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. (Source: CVC).]]
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|'''[[Vegetation]]'''
|'''[[Vegetation]]'''
*Replace dead plantings annually to achieve 80% cover by the third growing season;
*Replace dead plantings annually to achieve 80% cover by the third growing season;
*Do not apply chemical fertilizers.
*Do not apply chemical fertilizers.
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|[[File:Vegetation bio pass.PNG|415px|thumb|center|The planted portion of the bioretention cell is completely covered with dense, attractive vegetation which helps to maintain its stormwater treatment function and aesthetic value.]]
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|[[File:Vegetation bio fail .PNG|390px|thumb|center|A larger portion of the bioretention cell has no vegetation cover which reduces its aesthetic value and could be negatively affecting its stormwater treatment function. Much less than 80% of the planting area is covered by living vegetation requiring immediate maintenance and reseeding.]]
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|'''[[Overflow|Overflow Outlet]]'''
|'''[[Overflow|Overflow Outlet]]'''
*Keep free of obstructions;
*Keep free of obstructions;
*Remove trash, debris and sediment biannually to quarterly.
*Remove trash, debris and sediment biannually to quarterly.
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|[[File:Overflow bio pass.PNG|420px|thumb|center|The overflow outlet is free of damage and obstruction and functions as originally designed.]]
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|[[File:Overflow bio fail.PNG|380px|thumb|center|The overflow outlet is partially obstructed with trash and debris which reduces its capacity to safely convey excess water from the BMP, likely due to excess ponding thus obstructing outflow and impairing overall drainage function of the BMP.]]
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|'''[[Underdrain|Sub-drain]]'''
|'''[[Underdrain|Sub-drain]]'''
*Keep pipe and flow restrictor free of obstructions by flushing annually;
*Keep pipe and flow restrictor free of obstructions by flushing annually;
*Inspect flow restrictor frequently (e.g., biannually to quarterly).
*Inspect flow restrictor frequently (e.g., biannually to quarterly).
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|[[File:Underdrain bio pass.PNG|410px|thumb|center|There are no erosion gullies or bare soil areas on the filter bed surface and mulch cover remains in place.]]
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|[[File:Underdrain bio fail.PNG|400px|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. (Source: CVC).]]
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|'''[[Monitoring well]]'''
|'''[[Monitoring well]]'''
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*[[Wells|Standpipes]] should be securely capped on both ends and remain undamaged.
*[[Wells|Standpipes]] should be securely capped on both ends and remain undamaged.
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|[[File:MonitoringWell bio pass.PNG|420px|thumb|center|There are no erosion gullies or bare soil areas on the filter bed surface and mulch cover remains in place.]]
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|[[File:MonitoringWell bio fail.PNG|400px|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. (Source: CVC).]]
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