Judgment - PECA 24.25 - 19.06.2026

 PROPOSED DEVELOPMENT

     3.1. Stormwater Concept
An underground drainage system will be provided internally to the site to capture and convey runoff from the minor
storm event. Final sizing of the minor system will be undertaken as part of the detailed design in accordance with
the Queensland Urban Drainage Manual (QUDM) and AS3500.3. The minor system will be designed for the 10%
Average Exceedance Probability (AEP) storm event as required for central business and commercial.

The site will be graded to allow runoff from the major storm event to drain as overland flow to the existing kerb and
channel across the site frontages. The site will graded to allow runoff to discharge similar to existing conditions.

Stormwater quality will be managed through the following treatment measures.

     •       An Atlan Hydrochanel is proposed at the southwest corner of the site to collect and treat runoff from the
             driveway area.

     •       An Atlan Basin is proposed at the northwest corner to treat runoff from the western roof area and pathways.
             Atlan Basins are proposed due to space limitations in this part of the site. Atlan Stormsacks will also be
             provided on grated inlet pits in this catchment to act as primary treatment prior to the Atlan Basin.

     •       A 30m² bio retention basin is proposed in the northeast corner of the site. The eastern half of the site
             including runoff from roof areas, paths and carparking will be discharged to this basin.

Stormwater treatment devices will be installed as high as possible to avoid influence from tidal levels. It is anticipated
that the base of the bioretention basin and Atlan Basins will be above the Highest Astronomical Tide (HAT) Level.
Refer to Section 4.1 for further information on tide levels for the site.

A copy of the proposed ground floor plan of the development is attached in Appendix B.

Refer to Appendix C for the proposed development concept plans plan illustrating the stormwater layout described
above and relevant catchment plans. Other elements of the proposed stormwater system are described in the
following sections.


     3.2. Lawful Point of Discharge
The lawful point of discharge test, as described in Section 3.9.1 of QUDM, requires:

         •    The development does not change the flow characteristics leaving the site; or
         •    The proposed development will not alter the sites stormwater discharge in a way that may substantially
              damage a third-party property; or
         •    The location of the discharge from the site is under lawful control of the government or other statutory
              authority from whom permission to discharge has been received; or
         •    An authority to discharge has been obtained.

As described in Section 2.2, the existing lawful point of discharge is Thomas Street, Gympie Terrace and Albert
Street. It is intended to maintain the existing lawful point of discharge for the development.




Project number 20230025                                                                                   Page 7 of 22
File 20230025_Gympie Tce Hotel SWMP, 2023-05-31 Revision 0


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