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Inspection and Maintenance: Underground Infiltration Systems (view source)
Revision as of 14:14, 4 August 2022
, 1 year agono edit summary
*Provide a means of draining [[infiltration chambers]] by gravity (e.g., pipe and valve through the control structure weir wall) to make [[inspection and maintenance]] work that requires drainage of the BMP (e.g., filter bed and control structure inspection and sediment removal, repairs to control structure) easier to perform.
*Provide a means of draining [[infiltration chambers]] by gravity (e.g., pipe and valve through the control structure weir wall) to make [[inspection and maintenance]] work that requires drainage of the BMP (e.g., filter bed and control structure inspection and sediment removal, repairs to control structure) easier to perform.
*To remove accumulated sediment from [[underdrain]] pipes and chamber system units, a hydrovac truck equipped with a JetVac nozzle should be employed that uses pressured jets of water to propel itself through the structure while scouring and directing suspending sediments to a collection point. As the nozzle is retrieved, the sediment is flushed into the manhole or catchbasin sump for removal by vacuuming. Selecting an appropriate JetVac nozzle will depend on the structure being cleaned. For chamber system units, fixed nozzles designed for culverts or large diameter pipe cleaning with rear-facing jets are preferable (consult product manufacturer for further guidance).
*To remove accumulated sediment from [[underdrain]] pipes and chamber system units, a hydrovac truck equipped with a JetVac nozzle should be employed that uses pressured jets of water to propel itself through the structure while scouring and directing suspending sediments to a collection point. As the nozzle is retrieved, the sediment is flushed into the manhole or catchbasin sump for removal by vacuuming. Selecting an appropriate JetVac nozzle will depend on the structure being cleaned. For chamber system units, fixed nozzles designed for culverts or large diameter pipe cleaning with rear-facing jets are preferable (consult product manufacturer for further guidance).
==Rehabilitation & Repair==
Table below provides guidance on rehabilitation and repair work specific to underground infiltration systems organized according to BMP component.
[[File:Lifting paver to clean.JPG|thumb|340px|Removign a section of pavers (where infiltration has decreased markedly, or all pavers (if necessary) should occur if surface drainage performance remains unacceptable. Joint fill and bedding layer will need be replaced at this point with new materials to help obtain initial design specifications (Photo Source: Western Interlock Inc., 2020)<ref>Western Interlock Inc. 2020.How to Remove Pavers and Replace Them. Repair & Maintenance. Authored June 2020. Accessed: 21 July 2022. https://westerninterlock.com/how-to-remove-and-replace-a-paver/</ref>]]
{|{| class="wikitable" style="width: 900px;"
|+'''Underground Infiltration Systems: Key Components, Typical Issues and Rehabilitation Requirements'''
|-
!Component
!Problem
!Rehabilitation Tasks
|-
| rowspan="3"|'''[[Underdrains|Sub-drain/Underdrain]]'''
|Sub-drain perforated pipe is obstructed by trash, debris, sediment or roots
|
*Schedule hydro-vac truck or drain-snaking service to remove the obstruction.
|-
|Perforated pipe caps are missing or damaged
|
*Replace missing or damaged caps.
|-
|'''[[Forebays|Isolator Row or Water Quality Forebay Unit]]'''
|
Sump is ≥ half full or average sediment depth is ≥ 8 cm
|
*Schedule maintenance work; First remove floating trash and debris by bucket strainer, then oil and grease by petroleum absorbing sponge. Then fully drain the row or unit by gravity, pumping or vacuuming, and remove accumulated sediment through use of a hydro-vac truck equipped with JetVac nozzle.
|-
|'''[[Manhole control structure]]'''
|
Structure or pipe connection is leaking and impairing the water storage capacity or function of the BMP
|
*Schedule work to repair cracks or seal leaking components. The BMP may need to be fully drained to make such repairs.
|}