RFI - ATTACHMENT A - SBSMP - Rev 2

                                                                               20169 - SBSMP/2
                                                                                          Page 19




8 CONCLUSION
The proposed Townhouse Development at 101-105 Eumundi Noosa Road, Noosaville has been
assessed for its impact on the quantity and quality of stormwater drainage.

If the proposed development maintains pre-development drainage patterns, the lawful points of
discharge are the stormwater drainage infrastructure within Lot 46 and 62 on SP132578, southeast
of the site and the Eumundi Noosa Road kerb and channel, west of the site.

No external catchments have been identified.

Onsite detention will be provided in the form of a detention basin to attenuate post development
peak flow rates and ensure non-worsening of flooding to properties and infrastructure adjacent to,
and downstream of the subject site. The detention basin will be designed to contain all flows up to
a Q20 storm event. Storm events exceeding Q20 will be expected to sheet flow across the
boundaries at or less than pre development flows. The volume and configuration of the on-site
detention system will be confirmed during detailed design stage.

Sediment generated during the construction phase shall be dealt with in accordance with an
Erosion and Sediment Control Plan to be kept on site during the construction phase.

The proposed development triggers the State Planning Policy 2017 (SPP 2017). The water quality
objectives (WQO’s) for South East Queensland have therefore been achieved by treating the roof
and surface stormwater runoff via a bio-retention basin and a rainwater tank for rainwater reuse,
prior to discharging to the Lawful Points of Discharge.

The subject site is not affected by flooding.




Site Based Stormwater Management Plan
Proposed Townhouse Development at 101-105 Eumundi Noosa Road, Noosaville