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Inspection and Maintenance: Bioretention & Bioswales (view source)
Revision as of 20:00, 28 April 2022
, 2 years ago→Routine Maintenance - Key Components and I&M Tasks
*[http://www.agrifs.ir/sites/default/files/Weeds%20of%20North%20America%20%7BRichard%20Dickinson%7D%20%5B9780226076447%5D%20%282014%29_2.pdf Weeds of North America (book), 2014, by Richard Dickinson and France Royer, University of Chicago Press, 656 pgs.]
*[http://www.agrifs.ir/sites/default/files/Weeds%20of%20North%20America%20%7BRichard%20Dickinson%7D%20%5B9780226076447%5D%20%282014%29_2.pdf Weeds of North America (book), 2014, by Richard Dickinson and France Royer, University of Chicago Press, 656 pgs.]
{|class="wikitable" style="width: 1000px;"
{|class="wikitable" style="width: 1500px;"
|+'''Bioretention/Swales: Key Components, Descriptions and Routine I&M Requirements'''
|+'''Bioretention/Swales: Key Components, Descriptions and Routine I&M Requirements'''
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!Component
!Component
!style="width: 600px"|Description
!style="width: 1500px"|Description
!style="width: 1000px"|Inspection & Maintenance Tasks
!style="width: 1500px"|Inspection & Maintenance Tasks
!style="width: 1000px"|Photo Example
!style="width: 600px"| <span style="color:green">('''Pass''')</span> Photo Example
!style="width: 600px"| <span style="color:red">('''Fail''')</span> Photo Example
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|'''[[Bioretention: Sizing|Contributing Drainage Area (CDA)]]'''
|'''[[Bioretention: Sizing|Contributing Drainage Area (CDA)]]'''
*Remove trash, debris and sediment from pavements (biannually to quarterly) and eavestroughs (annually);
*Remove trash, debris and sediment from pavements (biannually to quarterly) and eavestroughs (annually);
*Replant or seed bare soil areas as needed.
*Replant or seed bare soil areas as needed.
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|[[File:Pass.PNG|400px|thumb|center|CDA has not changed in size or land cover. Sediment, trash or debris is not accumulating and point sources of contaminants are not visible.]]
|[[File:Fail bio.PNG|380px|thumb|center|Size of the CDA has changed from design assumptions. A point source for contaminants is visible (i.e. lack of sediment controls on adjacent construction site). (Photo Source: North Carolina Cooperative Extension)]]
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|'''[[Pretreatment]]'''
|'''[[Pretreatment]]'''
*Remove trash, debris and sediment annually to biannually or when the device sump is half full;
*Remove trash, debris and sediment annually to biannually or when the device sump is half full;
*Measure sediment depth or volume during each cleaning, or annually to estimate accumulation rate and optimize frequency of maintenance
*Measure sediment depth or volume during each cleaning, or annually to estimate accumulation rate and optimize frequency of maintenance
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*Measure sediment depth or volume during each cleaning or annually to estimate accumulation rate and optimize frequency of maintenance;
*Measure sediment depth or volume during each cleaning or annually to estimate accumulation rate and optimize frequency of maintenance;
*Remove woody [[vegetation]] from filter bed at [[inlets]] annually.
*Remove woody [[vegetation]] from filter bed at [[inlets]] annually.
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|[[File:Inlets bio pass.PNG|400px|thumb|center|There is no evidence of damage or displacement of the inlet structure that would prevent runoff from freely entering the BMP.]]
|[[File:Inlets bio fail.PNG|390px|thumb|center|Accumulated sediment and vegetation is preventing stormwater from entering the BMP. Sediment on the pavement surface in front of the inlet indicates ponding is also occurring]]
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|'''Perimeter'''
|'''Perimeter'''
*Confirm the surface ponding footprint area dimensions are within ±10% of the design and that maximum surface ponding depth meets design specifications;
*Confirm the surface ponding footprint area dimensions are within ±10% of the design and that maximum surface ponding depth meets design specifications;
*Check for side slope erosion or damage that compromises water storage capacity
*Check for side slope erosion or damage that compromises water storage capacity
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*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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*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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*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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*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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*[[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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