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Inspection and Maintenance: Permeable Pavement (view source)
Revision as of 12:25, 21 July 2022
, 2 years agono edit summary
*Do not spread [[sand]] on permeable pavements as part of [[Winter|winter maintenance]] as it will quickly clog the joints or pores and impair drainage function. On permeable interlocking pavers and grid systems filled with gravel, if application of an anti-skid material is desirable, spread the same fine washed gravel material used to fill the paver joints or grid cells; and
*Do not spread [[sand]] on permeable pavements as part of [[Winter|winter maintenance]] as it will quickly clog the joints or pores and impair drainage function. On permeable interlocking pavers and grid systems filled with gravel, if application of an anti-skid material is desirable, spread the same fine washed gravel material used to fill the paver joints or grid cells; and
*[[Salt|De-icers]] should be used sparingly, as needed during winter. Due to their freely draining design, ice will not form on permeable pavements as readily as it does on conventional impermeable pavements during winter thaw-freeze cycles.
*[[Salt|De-icers]] should be used sparingly, as needed during winter. Due to their freely draining design, ice will not form on permeable pavements as readily as it does on conventional impermeable pavements during winter thaw-freeze cycles.
==Rehabilitation & Repair==
Table below provides guidance on rehabilitation and repair work specific to bioretention and dry swales organized according to BMP component.
{|{| class="wikitable" style="width: 1000px;"
|+'''Permeable Pavements: Key Components, Typical Issues and Rehabilitation Requirements'''
|-
!Component
!Problem
!Rehabilitation Tasks
|-
| rowspan="3"|'''[[Permeable pavements: Specifications|Pavement Surface]]'''
|Major cracks, spalling or raveling of the porous asphalt or pervious concrete surface
|
*Fill small potholes or cracks with patching mixes (consult with product vendor for further guidance). Large potholes or cracks may require cutting and replacement of a section of the surface layer. Replace with the same permeable material where possible. Conventional asphalt or concrete could be acceptable if the cumulative area remains below 15% of the total BMP footprint area.
|-
|Paver or grid unit is missing, damaged or displaced
|
*Replace or reset unit by hand and restore joint or grid cell fill material that meets design specification.
|-
|Surface [[infiltration]] rate is < 250 mm/h
|
*Sweep and thoroughly vacuum with a pure vacuum sweeper to remove accumulated sediment. Replace [[OPSS aggregates|joint fill material]] removed through vacuuming. Pretreatment of the surface of slow draining pavements (e.g., water-assisted techniques, additional sweeping) prior to vacuuming may be warranted where surface [[clogging]] of joints or pores is visible. If surface drainage performance remains unacceptable, remove all pavers, [[Choker layer|bedding]] and joint fill and top 5 cm (2”) of base [[Reservoir aggregate|aggregate]] and replace with new materials that meet design specifications.
|-
|'''[[Vegetation]]'''
|
Poor grass cover on interlocking permeable grid system
|
*Aerate or remove and replace growing medium in affected area with material that meets design specifications and replant.
|-
|'''[[Underdrain|Sub-drain]]'''
|
Sub-drain perforated pipe is obstructed by sediment.
|
*Schedule [[Permeable pavements: Maintenance|hydro-vac truck]] or drain-snaking service to remove the obstruction.
|}
[[File:Sediment removal.PNG|500px]]
<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>