Appendix 3 - Stormwater quality management plan

Operational Management and Maintenance Manual for Stormwater Quality Improvement Devices             CC-3668



4.3.    Inspection and Maintenance
The scope of inspection and maintenance tasks should include verifying the function and condition of
the following aspects:

       Vegetation;
       Inlet;
       Batter slopes and base invert;
       Outlet; and
       Rainfall events.

Table 4.1 outlines the various inspection and maintenance tasks required for each aspect of the
bioretention system.

4.4.    Reporting and Log Booking
A historic record of inspections and maintenance undertaken is to be kept and made available for review
at all times. An inspection and maintenance checklist for bioretention systems has been developed and
is provided in Appendix A. The inspection and maintenance checklist provided in Appendix A is specific
for this development and is based on the checklist provided in Maintaining Vegetated Stormwater Assets
(Water By Design, 2012a).

4.5.    Resetting of Bioretention System
With proper regular maintenance, the expected service life of a bioretention system is typically 20 -30
years. At such time, it may be necessary to replace some or all of the filter media to ensure effective
pollutant removal. To ensure the maximum service life of a bioretention system it is critical that the
filter media used is efficient in the capture and removal of target pollutants. It is also critical that dense
and healthy vegetation is maintained in order to remove nutrients and maintain the hydraulic
conductivity of the filter media. Regular and proper maintenance of the bioretention system will help
to ensure the efficiency and lifespan of the bioretention system is optimised.




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