16-001014-02A (Ultimate SCMMP)

 Treatment Device / Property              Inspection                                           Inspection Frequency           Corrective Action1
                                          Check 80% vegetation cover on batters and
                                                                                                                              Re‐establish vegetation using thriving vegetation within the asset
                                          in water up to 300mm deep
                                          Check that the average plant height is >
 Vegetation                                                                                                                   Monitor plant growth where necessary
                                          500mm
                                          Check that plants are healthy and free                                              If problem persists seek advice from a horticulturalist as per WBD’s
                                          from significant disease.                                                           Rectifying Vegetated Stormwater Assets (2012).
 Weeds2                                                                                                                       Remove and control weed species. If problem is reoccurring increase
                                          Check that weed cover is less than 10%
 (emergent, floating or submerged)                                                                                            maintenance frequency for weed removal over a period
                                                                                                                              Undertake filling, profiling, and (if necessary) replanting using hand
                                          Undertake mosquito testing ‐ 1 larvae per
 Mosquitoes                                                                                                                   tools or light machinery. If problem persists refer to WBD’s
                                          2 ladle dips (300mL ladle)
                                                                                                                              Rectifying Vegetated Stormwater Assets (2012).
 Fertiliser3                              Check for fertiliser on banks of WQCP                                               Remove where fertiliser has not been specifically scheduled
                                                                                                                              Remove using rakes or specialist machinery.
                                                                                                                              If algal mats exceed 10%, the need to identify the source of the
                                          Check that cover of algal mats does not            Quarterly during dry season      problem is required – refer to WBD’s Rectifying Vegetated
 Algal Mats                               exceed 10% on two consecutive                      and every two months             Stormwater Assets (2012)
                                          inspections                                        during wet seasons                ‐ As high nutrient concentrations into the WQCP can result in
                                                                                                                                 excessive algal mats, check upstream device (and clean out where
                                                                                                                                 necessary), implement catchment management solutions.
                                          Check that the water is clear, that is
                                          turbidity is such that the floor of the pond                                        Identify problem as per WBD’s Rectifying Vegetated Stormwater
                                          can be seen at 0.75m depth                                                          Assets (2012) and implement necessary action:
                                          Check for algal blooms                                                               ‐ Restrict access to WQCP using signage, public notification to
                                          Check that macrophyte coverage to be                                                   prevent health risks (note basin area is fully fenced and separated
                                          above 50% of the WQCP water surface.                                                   from public access)
 Cyanobacterial Blooms                    If above indicators for cyanobacterial                                               ‐ If low vegetation cover, immediately re‐establish. Replant with
                                          blooms reveals non‐performance, water                                                  well‐established, dense vegetation.
                                          quality testing is required. Performance                                             ‐ If high nutrient concentrations in WQCP remove sediments, dry
                                          indicator is ≤500cells/mL of Microcystis                                               out WQCP for 1‐2weeks to destroy algae, remove nutrient source,
                                          aeruginosa or biovolume equivalent                                                     replant if necessary.
                                          ≤0.04mm3/mL combined total of
                                          cyanobacteria.




                      * Significant Rain Event defined as a 24 hour period with rainfall greater than 100mm, or shorter period with an average rainfall intensity greater than 50mm/hour.
1. Maintenance Requirements are based on Water by Designs, Maintaining Vegetated Stormwater Assets (2012) and Rectifying Vegetated Stormwater Assets (2012). Refer to these documents for further details.
                                                2. Refer to latest version of HumeGard Maintenance Guide for details of inspection and maintenance procedures.