Stormwater Treatment & Water Quality Management Plan_April2014

4.2 RAINGARDEN MAINTENANCE PROCEDURES
Objective        To maintain the raingarden systems to ensure that it continues to remove pollutants from stormwater runoff, as
                 intended during the design phase.
Actions          Description                                                               Responsibility Timeframe
General                Remove accumulated litter / debris to pond and grates              Developer      Every three months for first
Maintenance                                                                                               year of operation – during
                       Remove accumulated sediments at inlet                                             On-maintenance period
                       Remove impermeable layer if water ponds for more than a
                        few hours
                       Remove weeds and dead plants
                       Replace plants where necessary
                       Water plants as necessary
                       Reinstate areas that have eroded and holes in media
                       Ensure energy dissipation at entry and exit points is adequate
                        and repair if necessary
                       Control erosion and sediment loss upstream or within system
                        where necessary
                       Check builders working upstream block inlet to biopod with
                        filter bags and ring edge with sediment fence. If not compliant,
                        ring building compliance officer.
Following Off-         Remove accumulated litter / debris to pond and grates              Householder    Every six months (or as
maintenance                                                                                               necessary) following first
                       Remove accumulated sediments at inlet                                             year.
                       Remove impermeable layer (such as oily or clayey sediment)
                        if water ponds for more than a few hours
                       Remove weeds and dead plants