LATE RFI - SCG 33114 - CD Issue 3 07.03 (2)

Issue: Location of Stormwater Discharge Outlet

The submitted Stormwater Management Plan (33114-SW1.1, dated June 2023) proposes a stormwater structure
(headwall) that is wholly located outside the subject site and within State property, with Council as trustee. The
proposed development must be wholly contained within the subject site unless written owners’ consent is provided
to Council.

Council recognises that if the proposed location of the proposed headwall wishes to be pursued, a drainage
easement must be registered against proposed Unit 10 (subject to any plan changes) and 12 Lake MacDonald
Drive. The easement would need to be of sufficient width to accommodate the ongoing maintenance and
construction of the headwall.

Information Required
4.      Provide written owners’ consent from Council’s Property and Infrastructure departments indicating their
        support for the proposed infrastructure to be constructed and maintained within the lot, and to be
        burdened by the easement described above.

5.       Alternatively, provided a full suite of amended plans demonstrating that all stormwater structures
         (headwall) are contained entirely within the subject site. The amended plans must be prepared by a
         suitably qualified person (RPEQ – Registered Professional Engineer of Queensland) and include the
         necessary drainage easements.

Response
We have amended our Stormwater Management Plan to remove the stormwater structure external to the site.

Issue: Sustainable Building Design Code

The proposed stormwater management plan does not include 3,000 litres of rainwater storage per dwelling as
required by Performance Outcome PO2 of the Sustainable Building Design Code.

Information Required
6.      Provide sufficient detail to demonstrate that the development achieves compliance with Performance
        Outcome PO2 of the Sustainable Building Design Code. The detail must be prepared by a suitably
        qualified person (RPEQ – Registered Professional Engineer of Queensland).

Response
As raised on recent development applications, we are of the opinion the inclusion of a 3000Lt water tank per
dwelling on higher density developments results in over development of unnecessary infrastructure. We request
Noosa Council to consider the reuse of stormwater for the proposed development for external uses only.

In addition, Waterwise Queensland – “Efficient irrigation for water conservation: guideline for water efficient urban
gardens & landscape” (attached) outlines irrigation requirements across Queensland (see extracted table below).
Based on a month’s supply using the August median irrigation rates of 15mm/week/ 1m2. The required storage to
service all communal landscaped areas (150m2) within the development would require approximately 9 kL of
stored water. Therefore we consider the proposal for 14kL adequate for the development.




SCG Consulting Engineers                             Page 2 of 4                                    SCG Ref:33114(L1)