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Appendix 3 - Stormwater quality management plan
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Plans and drawings
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Log in to see the plans as drawnOperational Management and Maintenance Manual for Stormwater Quality Improvement Devices CC-3668
Maintenance Preventative / Corrective
Aspect Performance Indicator Inspection Frequency Inspection Activities
Frequency Maintenance Activities
Batter Slopes and Base Invert
Erosion Minor erosion only that does Identify any scouring of Repair damage to the
not pose a risk to public the base invert from bioretention system profile
safety or structural integrity storm flows, rill erosion of resulting from scour, rill erosion
and would not worsen if left the batter slopes from or vehicle damage and if
unattended. lateral inflows or damage necessary re-profile the batter
to the batter profile from slopes and invert and revegetate
vehicles. to original design specification.
Crust of Fine No surface crusting. Identify any areas of Remove sediment where it is
Sediment obvious surface crusting. impeding the surface
conveyance or the hydraulic
conductivity of the bioretention
system and/ or smothering the
vegetation.
Depressions or No surface depressions or Identify any areas of Fill localised sag points with
Mounds mounds >100mm. depressions or mounds topsoil or remove excess
Immediately following
>100mm. sediment. If required, re-grade
first 3 storm events after
the batter slopes and re-
construction complete. As inspection
establish plantings.
Then 2 monthly during results dictate
wet season / 4 monthly
Hydraulic Filter media is draining Identify any surface Remove any sediment from the
during dry season
Conductivity or freely, whereby water is not ponding of water or boggy surface of the filter media, the
Permeability ponded on the surface for conditions. transition or drainage layers or
more than 12 hours after the under-drains. If necessary,
rainfall and there is no install sediment and erosion
obvious impermeable or control measures.
clay-like surface on the filter
media.
Underdrains / Clean out points not Check for any damage to Repair any damage to the clean
Clean Out Points damaged and end caps clean out points and out points and reinstall end
securely in place. ensure end caps are caps. Use clean out points to
Underdrain outlets are free securely in place. Check flush sediment from underdrains
draining. that underdrain outlets as required.
are not blocked and are
free draining.
7
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