Changes

!<br>'''Verification Inspection'''

!<br>'''Verification Inspection'''

|-

|-

|rowspan="23"|'''Visual Indicators'''

|rowspan="2"|'''[[Bioretention: Sizing|Contributing Drainage Area]]'''

|-

|-

|CDA condition  

|CDA condition  

|x

|x

|x

|x

|-

|-

|Inlet/Flow Spreader Structural Integrity

|Inlet/Flow Spreader Structural Integrity

|x

|x

|

|

|-

|-

|BMP dimensions

|BMP dimensions

|

|

|x

|x

|-

|-

|Standing water  

|Standing water  

|x

|x

|x

|x

|-

|-

|Vegetation cover

|Vegetation cover

|x

|x

|

|

|-

|-

|Monitoring well condition

|Monitoring well condition

==Construction Inspection Tasks==

==Construction Inspection Tasks==

[[File:LID-IM small.jpg|thumb|500px|Performance Inspection of a Rain garden. [https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/low-impact-development/low-impact-development-stormwater-practice-inspection-and-maintenance-guide/ Photo source: TRCA].<ref>TRCA. 2019. Low Impact Development Stormwater Inspection and Maintenance Guide. https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/low-impact-development/low-impact-development-stormwater-practice-inspection-and-maintenance-guide/</ref>]]

[[File:LID-IM small.jpg|thumb|400px|Performance Inspection of a Rain garden. [https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/low-impact-development/low-impact-development-stormwater-practice-inspection-and-maintenance-guide/ Photo source: TRCA].<ref>TRCA. 2019. Low Impact Development Stormwater Inspection and Maintenance Guide. https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/low-impact-development/low-impact-development-stormwater-practice-inspection-and-maintenance-guide/</ref>]]

Construction inspections take place during several points in the construction sequence, specific to the type of LID BMP, but at a minimum should be done '''weekly''' and include the following:

Construction inspections take place during several points in the construction sequence, specific to the type of LID BMP, but at a minimum should be done '''weekly''' and include the following:

# During site preparation, prior to BMP excavation and grading to ensure the CDA is stabilized or that adequate ESCs or flow diversion devices are in place and confirm that construction materials meet design specifications

# During site preparation, prior to BMP excavation and grading to ensure the CDA is stabilized or that adequate ESCs or flow diversion devices are in place and confirm that construction materials meet design specifications

# Prior to hand-off points in the construction sequence when the contractor responsible for the work changes (i.e., hand-offs between the storm sewer servicing, paving, building and landscaping contractors)

# Prior to hand-off points in the construction sequence when the contractor responsible for the work changes (i.e., hand-offs between the storm sewer servicing, paving, building and landscaping contractors)

# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure [https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf Erosion Sediment Controls (ESCs)] and pretreatment or flow diversion devices are functioning and adequately maintained. View the table below, which describes critical points during the construction sequence when inspections should be performed prior to proceeding further. You can also download and print the table [https://wikidev.sustainabletechnologies.ca/images/7/7f/Construction_Inspection.pdf '''here''']<br>

# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure [https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf Erosion Sediment Controls (ESCs)] and pretreatment or flow diversion devices are functioning and adequately maintained. View the table below, which describes critical points during the construction sequence when inspections should be performed prior to proceeding further. You can also download and print the table [https://wikidev.sustainabletechnologies.ca/images/7/7f/Construction_Inspection.pdf '''here''']<br>

{| class="wikitable" style="width: 1000px;"

{| class="wikitable" style="width: 1000px;"

|+'''Bioretention/Swales: Construction Inspections'''

|+'''Bioretention/Swales: Construction Inspections'''

*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.

|[[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. (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).]]  

|-

|-

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

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

*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).

|[[File:Underdrain bio pass.PNG|310px|thumb|center|There are no erosion gullies or bare soil areas on the filter bed surface and mulch cover remains in place.]]  

|[[File:Underdrain bio pass.PNG|310px|thumb|center|The perforated sub-drain pipe is not obstructed by sediment, debris or roots and shows no signs of damage.]]  

|[[File:Underdrain 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. (Source: CVC).]]  

|[[File:Underdrain bio fail.PNG|300px|thumb|center|Roots have penetrated the underdrain/sub-drain pipe and are substantially reducing its conveyance capacity. Structural damage, sediment/debris clogs or vegetation roots are visible and are reducing the conveyance capacity of the pipe by one third (33%) or more. (Photo Source: Pipelining Denver)]]  

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|'''[[Monitoring well]]'''

|'''[[Monitoring well]]'''

|

|

*[[Wells|Standpipes]] should be securely capped on both ends and remain undamaged.

*[[Wells|Standpipes]] should be securely capped on both ends and remain undamaged.

|[[File:MonitoringWell bio pass.PNG|320px|thumb|center|There are no erosion gullies or bare soil areas on the filter bed surface and mulch cover remains in place.]]  

|[[File:MonitoringWell bio pass.PNG|340px|thumb|center|The well is undamaged and accessible and the cap is in place and secured to prevent unauthorized access.]]  

|[[File:MonitoringWell 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. (Source: CVC).]]  

|[[File:MonitoringWell bio fail.PNG|300px|thumb|center|The well standpipe has been damaged by snow plowing, which impairs its use for monitoring and is a safety hazard. With the cap unable to be secured unauthorized access can also occur.]]  

|}

|}

==Rehabilitation & Repair==

==Rehabilitation & Repair==

Table below provides guidance on rehabilitation and repair work specific to bioretention and dry swales organized according to BMP component.  

Table below provides guidance on rehabilitation and repair work specific to bioretention and dry swales organized according to BMP component.