Reference Document - MCU12/0133.04

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Noosa FLC Extension to Existing Gymnasium and Additional Pavements
19 February 2025                                                                                      Ref. No. 2025.0108



Alignment of Proposed Changes with the Existing Stormwater Management Strategies
The previous stormwater management strategy incorporates several key features to ensure minimal impact
on site permeability, runoff, and pollutant generation. The proposed development has been assessed against
these features as below.

Table 2        Alignment of Proposed Changes with the Existing Stormwater Management Strategy

 KEY FEATURE                               DETAILS                                COMMENTS ON PROPOSED
                                                                                  DEVELOPMENT
 Ground-Level Permeability                 - At least 90% of the site will        - Despite a slight increase in slab-
                                           remain permeable to support            on-ground area, the site remains
                                           natural infiltration. - 3% of the      90% permeable, maintaining
                                           site (177 m²) will have slab-on-       natural infiltration.
                                           ground construction (Music
                                           building for soundproofing, and
                                           part of the Create building due to
                                           raised ground levels). - Most
                                           structures will be on raised piers
                                           to preserve infiltration
                                           characteristics and protect
                                           shallow tree roots.
                                           - 7% of the site will be car
                                           parking, using permeable
                                           pavement to reduce runoff.
 Minimal Structural Footprint              - 68% of the site will remain free     - 64% of the site will remain free
                                           of buildings or car parks,             of building or car parks
                                           minimizing changes to pollutant
                                           filtration and infiltration
                                           properties.
                                            - Includes retention of existing
                                           vegetation and revegetation with
                                           native species.
 Roof Runoff Management                    -25% of the site will be covered       - The increase in roof area is only
                                           by roofs.                              2.6% compared to previous
                                           - 60% of roof areas will drain into    approved works.
                                           rainwater tanks for non-potable        - No additional roof area is
                                           water use.                             proposed for this application.
                                                                                  - Rainwater tanks and infiltration
                                           - 60% of captured water will be
                                                                                  trenches remain functional for
                                           reused, with overflow directed to
                                                                                  water reuse and natural
                                           infiltration trenches.
                                                                                  infiltration.
                                           - Some roof areas will drain
                                           directly into infiltration trenches
                                           instead of rainwater tanks, due to
                                           the site’s low non-potable water
                                           demand.
                                           - The mean annual volume of
                                           surface runoff leaving the site will
                                           be 20% lower than existing levels
                                           due to rainwater harvesting and
                                           infiltration.