Reference Document Stormwater Management Plan May 2024 MCU24/0074

 5.1.4 Atlan Basin
The Atlan Basin is an advanced prefabricated, compact and self-contained stormwater treatment system that
provides similar treatment to a bioretention area.

Preliminary sizing was requested from Atlan for the proposed Atlan Basin. Atlan undertake their own in-house
MUSIC modelling and provide recommended sizing for their products to meet the required water quality
objectives. Attached in Appendix E is a drawing of the recommended unit. Below is a typical detail of the
proposed unit.




                                                   Figure 5-2 -Atlan Basin Typical Detail


Atlan have recommended that their Stormsack product is installed to all inlet pits upstream of the Atlan Basin to
collect Gross Pollutants at source.

The Atlan Basin is a SQIDEP certified device having treatment efficiency that meets the SPP water quality objectives.
Below is output provided by Atlan from their MUSIC model for this particular site. The modelling indicates that the
proposed unit meets the water quality objectives for the site.




 5.1.5 Atlan Hydrochannel
The Hydrochannel is an insert that can be placed inside a channel grated drain of 300mm wide, and at least
450mm deep. It is designed for areas that would benefit from at source stormwater treatment, which would
otherwise be bypassed. This allows stormwater from high traffic areas (car parks and roads), industrial areas and

Project number 20230025                                                                                          Page 10 of 22
File 20230025_Gympie Tce Hotel SWMP, 2023-05-31 Revision 0



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