Appendix 3 - Stormwater quality management plan

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



 BIORETENTION SYSTEM INSPECTION AND MAINTENANCE CHECKLIST                                                                                              Page 2 of 3
                                                                      Inspection Site Visit                         Maintenance Site Visit
                                                                   Complies       Maintenance
      Aspect               Performance Indicator (PI)                                           Description of Maintenance           Description of Additional
                                                                    with PI?        Required?
                                                                                                        Undertaken                    Maintenance Required
                                                                   Y       N        Y       N
 Batter Slopes and Base Invert (cont.)
 Hydraulic          Filter media is draining freely, whereby
 Conductivity or water is not ponded on the surface for
 Permeability       more than 12 hours after rainfall and
                    there is no obvious impermeable or clay-
                    like surface on the filter media.
 Underdrains      / Clean out points not damaged and end
 Clean Out Points   caps securely in place. Underdrains are
                    free draining at outlets.
 Unusual Odours, None detected.
 Colours         or
 Substances (e.g.
 oil and grease)
 Litter and Debris  Maximum 1 piece per 4m2.

 Algal or      Moss   Maximum 10% of surface covered in
 Growth               algae and no moss growth.
 Outlet
 Erosion              Outlet is structurally sound and there is
                      no evidence of erosion or subsidence /
                      settlement, including around edges of
                      rock protection or tow of weir for large
                      systems.
 Damaged       or     No damage that poses a risk to public
 removed              safety or structural integrity.
 structures
 Sediment, litter     No blockage.
 or debris
 Downstream           No downstream impediments to the
 outfall              release of water, no erosion or damage
                      to the outfall structure, and no evidence
                      of malfunction (e.g. excessive sediment
                      accumulated).
 Rainfall Events
 Inspection after     Bioretention        system        operates
 rainfall             satisfactorily in wet conditions.



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