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Line 298: |Local or average sediment accumulation ≥ 5 cm in depth.Vegetation is not thriving and filter media is low in organic matter (<3%) or extractable phosphorus (<10 mg/kg)Sub-drain perforated pipe is obstructed by sediment or roots.
Inspection and Maintenance: Rainwater Harvesting (view source)
Revision as of 14:30, 16 August 2022
, 2 years ago→Rehabilitation & Repair
!Rehabilitation Tasks
!Rehabilitation Tasks
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|'''[[Inlets]]'''
|rowspan="2"|'''[[Inlets]]'''
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Pipes connected to eavestroughs or roof drains that deliver water to the BMP. May also include a pipe connected to the municipal water supply line for maintaining cistern water level during dry weather.
Pipes or fittings are damaged or displaced.
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*Add [[Level spreaders|flow spreading device]] or re-grade existing device back to level. Rake to regrade damaged portion of the filter bed and replant or restore [[mulch]]/[[stone]] cover. If problem persists, replace some mulch cover with stone.
*Schedule repairs.
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| rowspan="3"|'''[[Bioretention: Construction checklist|Filter Bed]]'''
|Ice is accumulating and obstructing inflow to BMP.
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*At [[inlets]] remove [[stone]] and use vacuum equipment or rake and shovel to remove sediment. For large areas or BMPs, use of a small excavator may be preferable. Restore grades with filter media that meets design specifications. Test surface infiltration rate (one test for every 25 m2 of filter bed area) to confirm it is > 25 mm/h. Replace [[stone]], [[mulch]] and [[vegetation]] coverage (re-use/transplant where possible). If problem persists, add [[pretreatment]] device(s) or investigate the source(s).
*Schedule installation of heat trace wire along eavestroughs, around roof drains and in aboveground [[pipes]], or disconnect the system during [[winter]].
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|Surface ponding remains for >48 hours or surface infiltration rate is <25 mm/h.
|rowspan="2"|'''[[Rainwater harvesting: Sizing and modeling#Cistern dimensions|Cistern]]'''
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*Remove sediment as described above. Core aerate (for sodded bioretention); or remove stone, sediment, mulch, and plant cover and till the exposed filter media to a depth of 20 cm; or remove and replace the uppermost 15 cm of material with filter media that meets specifications. Test surface infiltration rate (one test for every 25 m2 of filter bed area) to confirm it is > 25 mm/h. Replace stone, mulch and plants (re-use/ transplant where possible).
Cracks are visible or seals between joints in the structure are leaking.
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*Schedule repairs with oversight by the product manufacturer/vendor.
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|Cistern has reached 40 years of age and is due for replacement.
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*Replace cistern with new one that meets design specifications.
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|Damage to filter bed or slide slope is present (e.g., [[erosion]] rills, animal burrows, sink holes, ruts)
|'''[[Overflow|Overflow Outlet]]'''
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Overflow outlet pipe is obstructed by trash, debris or sediment.
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*Schedule drain snaking service or pressure/vacuum truck to remove the obstruction.
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|'''Make-up water supply'''
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System is malfunctioning (e.g., tops up cistern water level when unnecessary or fails to top up when needed).
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*Regrade damaged portion by raking and replant or restore [[mulch]]/[[stone]] cover. Animal burrows, sink holes and compacted areas should be tilled to 20 cm depth prior to re-grading. If problems persist, consider adding flow spreading device to prevent [[erosion]] or barriers to discourage foot or vehicular traffic.
*Schedule FIT work to determine the cause of system malfunction with oversight by the product manufacturer/vendor or a licensed plumber and electrician.
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|'''[[Vegetation]]'''
|'''[[Rainwater harvesting: Sizing and modeling#Cistern dimensions|Pump]]'''
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Pump is not delivering water to fixtures or not providing adequate water pressure.
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*Remove stone, mulch and plant cover and uppermost 5 cm of filter media, spread 5 cm of yard waste compost, incorporate into filter media to 20 cm depth by tilling. Replace stone, mulch and plants (re-use/transplant where possible).
*Schedule FIT work to determine the cause of system malfunction with oversight by the product manufacturer/vendor or a licensed plumber and electrician.
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|'''[[Underdrain|Sub-drain]]'''
|'''[[Rainwater harvesting: Sizing and modeling#Cistern dimensions|Pump]]'''
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Pump is not delivering water to fixtures or not providing adequate water pressure.
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*Schedule hydro-vac truck or drain-snaking service to clear the obstruction.
*Schedule FIT work to determine the cause of system malfunction with oversight by the product manufacturer/vendor or a licensed plumber and electrician.
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