2576 - SBSMP-01 (Feb 2026)

Table B: Post construction phase – stormwater management design objectives
Application:

(1) A material change of use for an urban purpose that involves premises 2500 metres2 or greater in size and:
       (a) will result in six or more dwellings; or
       (b) an impervious area greater than 25 per cent of the net developable area.
(2) Reconfiguring a lot for urban purposes that involves premises 2500 metres2 or greater in size and will result in six or more lots.

     Climatic region                                                           Design objectives
                                                       Reductions in mean annual load from unmitigated development (%)
                                               Total                 Total        Total         Gross        Waterway stability
                                           suspended              phosphorus    nitrogen      pollutants     management
                                           solids (TSS)              (TP)         (TN)          >5mm
     South East Queensland                        80                    60         45              90        Limit the peak 1-year
                                                                                                             ARI event discharge
     Central Queensland (south)                   85                    60         45              90
                                                                                                             within the receiving
     Central Queensland (north)                   75                    60        4015             90        waterway to the
                                                                                                             pre-development peak
     Cape York14, wet tropics and                 80                   6016        40              90
                                                                                                             1-year ARI discharge
     dry tropics


     Western Queensland14                         85                    60         45              90

Notes:

• Mapping of climatic regions is available on the State Planning Policy Interactive Mapping System.
• In lieu of modelling, the default bio-retention treatment area to comply with load reduction targets for all Queensland regions
  in 1.5 per cent of the contributing catchment area.
• Water stability objective applies if development drains to an unlined waterway within or downstream of the site where a risk of
  increased erosion exists due to changes in hydrology. Local government may also require application of the waterway stability
  objective where there are planned future rehabilitation works to return a lined channel to a natural channel design.

• The SPP Water quality guidance material provides advice on the measures that demonstrate compliance with table B.
14
   Note: Applies to population centres greater than 25,000 persons.
15
   Note: Mackay Regional Council has adopted a 35 per cent reduction for TN.
16
   Note: Townsville City Council has adopted a 65 per cent reduction for TP.




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